fix(maestro): update remaining id="app" references in web tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/maestro-daemon/src/session.rs

@@ -2916,17 +2916,16 @@ async fn mark_session_dead_with_worktree_settlement(
                 // Release anyone attached; the scrollback survives for a later
                 // attach.
                 record.bridge.seal();
-                let session = record.session.clone();
                 let worktree = record
                     .worktree_base_repo
                     .clone()
                     .zip(record.worktree_path.clone());
-                Some((session, worktree))
+                Some(worktree)
             }
             _ => None,
         }
     };
-    let Some((mut session, worktree)) = flipped else {
+    let Some(worktree) = flipped else {
         return false;
     };
     let stream = inner
@@ -2943,9 +2942,6 @@ async fn mark_session_dead_with_worktree_settlement(
     if settle_worktree {
         if let Some(wt) = &worktree {
             if settle_worktree_on_exit(inner, id, wt).await {
-                // The tree is settled (removed); a stale "in the way" would
-                // describe something the session no longer holds.
-                session.blocked_work = None;
                 let mut sessions = inner.sessions.lock().await;
                 if let Some(record) = sessions.get_mut(&id) {
                     record.session.worktree = None;
@@ -2957,13 +2953,17 @@ async fn mark_session_dead_with_worktree_settlement(
         }
     }
     // Settle has now been applied or refused either way (#115): from here on
-    // its outcomes are safe to observe.
-    {
+    // its outcomes are safe to observe. Re-read the session from the record
+    // so the sidecar write includes any updates (e.g. a haiku rename) that
+    // landed between the initial clone and now.
+    let session = {
         let mut sessions = inner.sessions.lock().await;
-        if let Some(record) = sessions.get_mut(&id) {
-            record.settled = true;
-        }
-    }
+        let Some(record) = sessions.get_mut(&id) else {
+            return false;
+        };
+        record.settled = true;
+        record.session.clone()
+    };
 
     let _ = inner.sidecar.write(&session);
     let _ = inner.events.send(CatalogEvent::SessionUpdated { session });

crates/maestro-daemon/tests/autoname.rs

@@ -11,14 +11,14 @@ use common::TmuxFixture;
 use maestro_daemon::sidecar::SidecarStore;
 use maestro_daemon::worktree::WorktreeManager;
 use maestro_daemon::SessionManager;
-use maestro_protocol::{display, CatalogEvent, CreateSessionRequest, NameSource};
+use maestro_protocol::{display, CatalogEvent, CreateSessionRequest, NameSource, SessionStatus};
 use tempfile::TempDir;
 use uuid::Uuid;
 
 struct Fixture {
     manager: SessionManager,
     sidecar: SidecarStore,
-    _tmux: TmuxFixture,
+    tmux: TmuxFixture,
     _state_dir: TempDir,
 }
 
@@ -35,7 +35,7 @@ fn fixture() -> Fixture {
     Fixture {
         manager,
         sidecar,
-        _tmux: tmux,
+        tmux,
         _state_dir: state_dir,
     }
 }
@@ -171,3 +171,37 @@ async fn a_blank_name_changes_nothing() {
     let live = fx.sidecar.read(id).unwrap().unwrap();
     assert_eq!(display::name_source(&live), NameSource::Generated);
 }
+
+/// A session that dies naturally (liveness watcher marks it dead) must not
+/// overwrite a haiku rename that landed before the death. Regression test for
+/// the stale-clone sidecar write in `mark_session_dead`.
+#[tokio::test]
+async fn session_death_preserves_the_haiku_name() {
+    let fx = fixture();
+    let id = spawn(&fx.manager, None).await;
+
+    fx.manager.claim_autoname(id).await.unwrap();
+    fx.manager.apply_autoname(id, "haiku-name").await.unwrap();
+
+    // Verify the sidecar has Haiku before the session dies.
+    let before = fx.sidecar.read(id).unwrap().unwrap();
+    assert_eq!(display::name_source(&before), NameSource::Haiku);
+
+    // Kill the tmux session directly so the liveness watcher picks it up.
+    fx.tmux.tmux.kill_session(id).expect("kill tmux directly");
+    fx.manager
+        .start_liveness_watcher(std::time::Duration::from_millis(25));
+
+    common::wait_for_async(std::time::Duration::from_secs(3), || async {
+        fx.manager.status(id).await == Some(SessionStatus::Dead)
+    })
+    .await;
+
+    let after = fx.sidecar.read(id).unwrap().unwrap();
+    assert_eq!(
+        display::name_source(&after),
+        NameSource::Haiku,
+        "mark_session_dead must not overwrite a haiku rename in the sidecar"
+    );
+    assert_eq!(display::custom_name(&after), Some("haiku-name"));
+}

crates/maestro-daemon/tests/embedded_bundle.rs

@@ -13,14 +13,14 @@ async fn embedded_index_is_real_spa_not_placeholder() {
     let html = String::from_utf8(body.to_vec()).unwrap();
 
     assert!(
-        html.contains(r#"id="app""#),
+        html.contains(r#"id="root""#),
         "served index is missing the SPA mount point; got:\n{html}"
     );
     assert!(
         !html.contains("maestro is running"),
         "served index is the placeholder, not the built bundle"
     );
-    // Stronger signal than `id="app"` (which appears in both source and built
+    // Stronger signal than `id="root"` (which appears in both source and built
     // HTML): the vite build rewrites the entry to a hashed `/assets/index-<hash>`
     // bundle, whereas the un-built source references `/src/main.ts`. This catches
     // both an empty/placeholder embed and the staleness case.

crates/maestro-daemon/tests/web_ui.rs

@@ -59,7 +59,7 @@ async fn root_serves_the_spa_shell() {
             .map(|v| v.starts_with("text/html")),
         Some(true)
     );
-    assert!(resp.text().await.unwrap().contains(r#"id="app""#));
+    assert!(resp.text().await.unwrap().contains(r#"id="root""#));
 }
 
 #[tokio::test]
@@ -69,7 +69,7 @@ async fn client_side_route_falls_back_to_the_shell() {
         .await
         .unwrap();
     assert_eq!(resp.status(), 200);
-    assert!(resp.text().await.unwrap().contains(r#"id="app""#));
+    assert!(resp.text().await.unwrap().contains(r#"id="root""#));
 }
 
 /// An unmatched API path must 404 rather than fall through to the SPA shell:

web/index.html

@@ -23,8 +23,7 @@
     <meta name="apple-mobile-web-app-title" content="maestro" />
   </head>
   <body>
-    <div id="app"></div>
     <div id="root"></div>
-    <script type="module" src="/src/main.ts"></script>
+    <script type="module" src="/src/index.tsx"></script>
   </body>
 </html>

web/src/App.tsx

@@ -1,9 +1,448 @@
-import { ThemeProvider } from "./contexts/ThemeContext";
+// The app shell (#253): everything main.ts used to wire by hand, as one React
+// tree. The stores are the state — a catalog store fed by the events socket, a
+// layout store holding the tab/split tree — and the hash route is a deep link
+// into the latter.
+
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+import { useStore } from "zustand";
+
+import "@fontsource/jetbrains-mono/400.css";
+import "@fontsource/jetbrains-mono/500.css";
+import "@fontsource/jetbrains-mono/600.css";
+import "@fontsource/jetbrains-mono/700.css";
+
+import { createSession, fetchNames, getDaemonInfo, gitRoot, projects as fetchProjects } from "./api.js";
+import {
+  CommandSet,
+  DEFAULT_LEADER,
+  controlByte,
+  defineCommands,
+  isBarTypingTarget,
+} from "./commands.js";
+import { ThemeProvider } from "./contexts/ThemeContext.js";
+import { CommandBar, SPAWN_DIRECTORY_EVENT, useCommandBar } from "./components/commandBar/index.js";
+import { DaemonLink, createDaemonLinkStore } from "./components/daemon/DaemonLink.js";
+import { RestartOverlay } from "./components/daemon/RestartOverlay.js";
+import { HelpOverlay } from "./components/dialogs/index.js";
+import { useViewport } from "./components/hooks/useViewport.js";
+import { Drawer } from "./components/layout/Drawer.js";
+import { MultiView, type MultiViewHandle } from "./components/layout/MultiView.js";
+import { Sidebar } from "./components/sidebar/index.js";
+import {
+  SpawnModal,
+  spawnSimilarProjectSeed,
+  spawnSimilarSeed,
+  useFastForward,
+  type SpawnFormProps,
+} from "./components/spawn/index.js";
+import { buildFastForwardRequest, fastForwardSeed, resolveFastForward } from "./fastForward.js";
+import { useHashRouter } from "./hooks/useHashRouter.js";
+import { usePreview } from "./hooks/usePreview.js";
+import { activeTab, findLeaf, openSessions } from "./layout.js";
+import { createCatalogStore, type CatalogStore } from "./stores/catalogStore.js";
+import { createLayoutStore, type LayoutStore } from "./stores/layoutStore.js";
+import type { Project, Session, SpawnPreset, Uuid } from "./types.js";
+import {
+  FOCUS_PANE_EVENT,
+  OPEN_SPAWN_EVENT,
+  SESSION_SELECT_EVENT,
+  SPAWN_SIMILAR_EVENT,
+  requestOpenSpawn,
+  requestToggleDrawer,
+} from "./uiEvents.js";
+
+type SpawnSeed = SpawnFormProps["seed"];
+
+/** Open modal state: `seed` is what the form starts from (undefined for a
+ *  plain spawn), `newTab` where the created session lands. */
+interface SpawnState {
+  seed: SpawnSeed;
+  newTab: boolean;
+}
 
 export function App() {
   return (
     <ThemeProvider>
-      <div id="react-root" />
+      <Shell />
     </ThemeProvider>
   );
 }
+
+function Shell() {
+  useViewport();
+
+  // One instance each, for the life of the page.
+  const catalogStore = useMemo(() => createCatalogStore(), []);
+  const layoutStore = useMemo(() => createLayoutStore(), []);
+  const linkStore = useMemo(() => createDaemonLinkStore(), []);
+
+  const sessions = useStore(catalogStore, (s: CatalogStore) => s.sessions);
+  const connected = useStore(catalogStore, (s: CatalogStore) => s.connected);
+  const loaded = useStore(catalogStore, (s: CatalogStore) => s.loaded);
+  const layout = useStore(layoutStore, (s: LayoutStore) => s.layout);
+
+  const [homeDir, setHomeDir] = useState<string | undefined>(undefined);
+  const [leader, setLeader] = useState(DEFAULT_LEADER);
+  const [spawn, setSpawn] = useState<SpawnState | null>(null);
+
+  const { route, navigate } = useHashRouter();
+  const { preview, previewedSessionId, commit: commitPreview, end: endPreview } = usePreview({
+    store: layoutStore,
+  });
+
+  useEffect(() => {
+    catalogStore.getState().start();
+    return () => catalogStore.getState().stop();
+  }, [catalogStore]);
+
+  // The daemon's home dir abbreviates cwds to `~/…`; its leader rebinds the
+  // chords hanging off it (#159), so the `?` overlay and the command bar show
+  // the configured chord rather than the default. Absolute paths and the
+  // default leader are fine fallbacks.
+  useEffect(() => {
+    void getDaemonInfo()
+      .then((info) => {
+        setHomeDir(info.home_dir);
+        if (info.leader) setLeader(info.leader);
+      })
+      .catch(() => {});
+  }, []);
+
+  // Installed mobile browsers suspend timers and WebSockets in the background.
+  // Replacing the socket on return avoids leaving the restart overlay up after
+  // a transient lost connection has already recovered.
+  useEffect(() => {
+    const recover = () => {
+      if (document.visibilityState !== "visible") return;
+      void linkStore.getState().probe();
+      catalogStore.getState().reconnect();
+    };
+    document.addEventListener("visibilitychange", recover);
+    window.addEventListener("pageshow", recover);
+    window.addEventListener("online", recover);
+    return () => {
+      document.removeEventListener("visibilitychange", recover);
+      window.removeEventListener("pageshow", recover);
+      window.removeEventListener("online", recover);
+    };
+  }, [catalogStore, linkStore]);
+
+  // The catalog is the authority on which sessions exist: a pane for a session
+  // that is no longer listed gets closed here, rather than waiting on its own
+  // socket to notice. Only once a list has actually landed — before that,
+  // "not listed" means "not known yet" and would close every restored pane.
+  useEffect(() => {
+    if (!loaded) return;
+    for (const id of openSessions(layout)) {
+      if (!sessions.has(id)) layoutStore.getState().closeSession(id);
+    }
+  }, [loaded, sessions, layout, layoutStore]);
+
+  const tab = activeTab(layout);
+  const focusedSessionId =
+    (tab.focusedLeafId && findLeaf(tab.root, tab.focusedLeafId)?.sessionId) || null;
+  const focusedSession = focusedSessionId ? sessions.get(focusedSessionId) : undefined;
+
+  /** Open/focus a session, settling any preview of it in place. Shared by the
+   *  hash router and the sidebar's click-driven path (#133), which can't rely
+   *  on `hashchange` alone — a split or drag can move focus without the hash
+   *  changing, leaving a click back onto that row silently ignored. */
+  const focusSession = useCallback(
+    (sessionId: Uuid) => {
+      // `commit` cancels a pending preview and opens the session; the layout
+      // store settles a matching preview in place rather than moving it twice.
+      commitPreview(sessionId);
+      navigate({ kind: "attach", sessionId });
+    },
+    [commitPreview, navigate],
+  );
+
+  // A deep link (`#/attach/:id`) opens the session it names. Only the route
+  // *changing* does this: focusing a pane rewrites the hash, and re-opening
+  // from that would fight the layout the operator just arranged.
+  const lastRouteRef = useRef<string | null>(null);
+  useEffect(() => {
+    const key = route.kind === "attach" ? route.sessionId : "catalog";
+    if (lastRouteRef.current === key) return;
+    lastRouteRef.current = key;
+    if (route.kind === "attach") layoutStore.getState().openSession(route.sessionId);
+  }, [route, layoutStore]);
+
+  /** Show a freshly spawned session: it gets its own pane rather than evicting
+   *  whatever the operator was reading. */
+  const mountSpawned = useCallback(
+    (session: Session, opts?: { newTab?: boolean }) => {
+      layoutStore.getState().openSessionBeside(session.id, opts);
+      navigate({ kind: "attach", sessionId: session.id });
+    },
+    [layoutStore, navigate],
+  );
+
+  const openSpawn = useCallback(
+    (seed: SpawnSeed, newTab: boolean) => {
+      endPreview();
+      setSpawn({ seed, newTab });
+    },
+    [endPreview],
+  );
+
+  /** The plain spawn: the session you were last on preselects its project, so
+   *  `n` then Enter spawns another session there without touching the picker.
+   *  It lands in a new tab, not a split of the pane you were reading (#100). */
+  const openPlainSpawn = useCallback(() => {
+    openSpawn(focusedSession ? spawnSimilarProjectSeed(focusedSession) : undefined, true);
+  }, [focusedSession, openSpawn]);
+
+  /** The focused session's project — its base repo for a worktree session, its
+   *  cwd otherwise (the rule spawnSimilarProjectSeed uses). */
+  const focusedProjectCwd = focusedSession
+    ? (focusedSession.worktree?.base_repo ?? focusedSession.cwd)
+    : undefined;
+
+  const fastForward = useFastForward({
+    focusedCwd: focusedProjectCwd,
+    onSpawned: (session) => mountSpawned(session),
+    onFallback: (seed) => openSpawn(seed, false),
+  });
+
+  const bar = useCommandBar({ onOpen: endPreview });
+
+  useEffect(() => {
+    const onOpenSpawnEvent = () => openPlainSpawn();
+    const onSpawnSimilar = (e: Event) => {
+      const s = (e as CustomEvent<Session>).detail;
+      if (s) openSpawn(spawnSimilarSeed(s), false);
+    };
+    const onSessionSelect = (e: Event) => focusSession((e as CustomEvent<Uuid>).detail);
+    document.addEventListener(OPEN_SPAWN_EVENT, onOpenSpawnEvent);
+    document.addEventListener(SPAWN_SIMILAR_EVENT, onSpawnSimilar);
+    document.addEventListener(SESSION_SELECT_EVENT, onSessionSelect);
+    return () => {
+      document.removeEventListener(OPEN_SPAWN_EVENT, onOpenSpawnEvent);
+      document.removeEventListener(SPAWN_SIMILAR_EVENT, onSpawnSimilar);
+      document.removeEventListener(SESSION_SELECT_EVENT, onSessionSelect);
+    };
+  }, [openPlainSpawn, openSpawn, focusSession]);
+
+  // Enter on a `~` row in the command bar (docs/COMMAND-BAR.md): the same
+  // fast-forward spawn, aimed at the chosen directory instead of the most
+  // recent project.
+  useEffect(() => {
+    const onSpawnDirectory = (e: Event) => {
+      void spawnInDirectory((e as CustomEvent<string>).detail, mountSpawned, (seed) =>
+        openSpawn(seed, false),
+      );
+    };
+    document.addEventListener(SPAWN_DIRECTORY_EVENT, onSpawnDirectory);
+    return () => document.removeEventListener(SPAWN_DIRECTORY_EVENT, onSpawnDirectory);
+  }, [mountSpawned, openSpawn]);
+
+  // Tab in the session list hands the keyboard to the pane; leader-h hands it
+  // back the other way. Handing it to a previewed pane is choosing it: the
+  // preview settles rather than snapping back when the list blurs.
+  const sidebarRef = useRef<HTMLDivElement>(null);
+  const viewRef = useRef<MultiViewHandle>(null);
+  const focusPane = useCallback(() => {
+    if (previewedSessionId) commitPreview(previewedSessionId);
+    viewRef.current?.focusPane();
+  }, [previewedSessionId, commitPreview]);
+
+  useEffect(() => {
+    document.addEventListener(FOCUS_PANE_EVENT, focusPane);
+    return () => document.removeEventListener(FOCUS_PANE_EVENT, focusPane);
+  }, [focusPane]);
+
+  // The global half of the command registry (#148). `n` opens the spawn modal
+  // and `N` fast-forwards a spawn (#67); both are plain keys, so the set's own
+  // `isTypingTarget` keeps them out of form fields and the terminal's hidden
+  // textarea. Leader-h moves the keyboard between the list and the pane — a
+  // chord, because an attached terminal owns every plain keystroke
+  // (docs/COMMAND-BAR.md).
+  useEffect(() => {
+    if (bar.open || spawn) return;
+    const spawnKeys = new CommandSet(
+      defineCommands({
+        "spawn.open": openPlainSpawn,
+        "spawn.fastForward": () => void fastForward(),
+      }),
+    );
+    const focusKeys = new CommandSet(
+      defineCommands(
+        {
+          "focus.toggle": () => {
+            if (sidebarRef.current?.contains(document.activeElement)) {
+              focusPane();
+            } else {
+              // No-op on desktop; on mobile the list is off-canvas until the
+              // drawer opens, so the focus has somewhere to land.
+              requestToggleDrawer();
+              sidebarRef.current?.querySelector<HTMLElement>("[tabindex]")?.focus();
+            }
+          },
+          // The escape hatch: binding ctrl-k takes readline's
+          // kill-to-end-of-line away from every pane, and leader ctrl-k gives
+          // it back as the literal 0x0B byte (docs/COMMAND-BAR.md).
+          "pane.literalCtrlK": () => viewRef.current?.sendInput("\x0b"),
+          // The leader pressed twice, tmux-style: one literal leader byte,
+          // built from the leader itself so a rebound one sends its own (#158).
+          "pane.literalLeader": () => viewRef.current?.sendInput(controlByte(leader)),
+        },
+        leader,
+      ),
+      { leader },
+    );
+    const onKeydown = (e: KeyboardEvent) => {
+      if (focusKeys.handle(e)) return;
+      if (isBarTypingTarget(e.target)) return;
+      spawnKeys.handle(e);
+    };
+    window.addEventListener("keydown", onKeydown, true);
+    return () => window.removeEventListener("keydown", onKeydown, true);
+  }, [bar.open, spawn, openPlainSpawn, fastForward, focusPane, leader]);
+
+  const openIds = useMemo(() => openSessions(layout), [layout]);
+  const barSessions = useMemo(() => [...sessions.values()], [sessions]);
+
+  return (
+    <>
+      <Drawer
+        sidebar={
+          <div ref={sidebarRef} className="contents">
+          <Sidebar
+            store={catalogStore}
+            homeDir={homeDir}
+            activeId={focusedSessionId}
+            openIds={openIds}
+            previewId={previewedSessionId}
+            onSelect={(id) => focusSession(id)}
+            onPreview={preview}
+            onSpawn={openPlainSpawn}
+            onSpawnDefaults={() => void fastForward()}
+            onSpawnSimilar={(s) => openSpawn(spawnSimilarSeed(s), false)}
+            onFocusPane={focusPane}
+          />
+          </div>
+        }
+      >
+        <MultiView
+          ref={viewRef}
+          store={layoutStore}
+          // Undefined until the first list lands: MultiView's boot
+          // reconciliation prunes against it, and an empty map would take
+          // every restored pane with it.
+          sessions={loaded ? sessions : undefined}
+          onDisconnect={(id) => layoutStore.getState().closeSession(id)}
+          emptyState={<Welcome onSpawn={requestOpenSpawn} />}
+        />
+      </Drawer>
+
+      <DaemonLink store={linkStore} connected={connected} />
+      <RestartOverlay store={linkStore} />
+      <HelpOverlay />
+
+      {bar.open && (
+        <CommandBar
+          sessions={barSessions}
+          homeDir={homeDir}
+          onOpenSession={(id) => {
+            bar.closeBar();
+            focusSession(id);
+          }}
+          onClose={bar.closeBar}
+        />
+      )}
+
+      {spawn && (
+        <SpawnModal
+          seed={spawn.seed}
+          onSuccess={(session) => mountSpawned(session, { newTab: spawn.newTab })}
+          onClose={() => setSpawn(null)}
+        />
+      )}
+    </>
+  );
+}
+
+async function spawnPresets(): Promise<SpawnPreset[]> {
+  try {
+    const info = await getDaemonInfo();
+    if (info.presets?.length) return info.presets;
+  } catch {
+    // keep fallbacks
+  }
+  const { FALLBACK_PRESETS } = await import("./components/spawn/model.js");
+  return FALLBACK_PRESETS;
+}
+
+/** A directory the project scan never saw stands in as its own project; one
+ *  outside any repo spawns without a worktree, since there is no repo to cut a
+ *  branch from. Anything still unresolved opens the pre-filled form. */
+async function spawnInDirectory(
+  path: string,
+  onSpawned: (session: Session) => void,
+  onFallback: (seed: SpawnSeed) => void,
+): Promise<void> {
+  const [discovered, handle] = await Promise.all([
+    fetchProjects().catch(() => [] as Project[]),
+    fetchNames(1)
+      .then((batch) => batch.names[0])
+      .catch(() => undefined),
+  ]);
+  const presets = await spawnPresets();
+  const known = discovered.find((p) => p.path === path);
+  const project: Project = known ?? { path, name: path.split("/").filter(Boolean).pop() ?? path };
+  const resolved = resolveFastForward([project], presets, handle, path);
+  const req = buildFastForwardRequest(resolved);
+  if (req) {
+    const inRepo =
+      known !== undefined ||
+      (await gitRoot(path)
+        .then((r) => !!r.root)
+        .catch(() => false));
+    if (!inRepo) delete req.worktree;
+    try {
+      onSpawned(await createSession(req));
+      return;
+    } catch {
+      // A failed POST degrades to the pre-filled form, never a dead row.
+    }
+  }
+  onFallback(fastForwardSeed(resolved));
+}
+
+/** The content pane with nothing open. The ☰ is mobile-only: with no pane
+ *  there is no pane header to carry it, so the drawer would be swipe-only. */
+function Welcome({ onSpawn }: { onSpawn(): void }) {
+  return (
+    <div className="empty content-welcome">
+      <div className="empty-glyph" aria-hidden="true">
+        ⌘
+      </div>
+      <div className="empty-title">No session open</div>
+      <p className="empty-hint">
+        Pick a session from the list, or start a new one. Open sessions keep streaming in the
+        background — switching back is instant.
+      </p>
+      <p className="empty-hint">
+        Press <kbd>?</kbd> for keyboard shortcuts.
+      </p>
+      <div className="empty-actions">
+        <button
+          type="button"
+          className="btn btn-ghost welcome-sessions"
+          onClick={() => requestToggleDrawer()}
+        >
+          ☰ Sessions
+        </button>
+        <button
+          type="button"
+          className="btn btn-primary"
+          title="Draft pane: n — fast-forward spawn: N"
+          onClick={onSpawn}
+        >
+          + Spawn session
+        </button>
+      </div>
+    </div>
+  );
+}

web/src/attach.ts

@@ -1,659 +0,0 @@
-import { FitAddon } from "@xterm/addon-fit";
-import { WebglAddon } from "@xterm/addon-webgl";
-import { Terminal } from "@xterm/xterm";
-import "@xterm/xterm/css/xterm.css";
-
-import { attachWsUrl } from "./routes.js";
-import { INITIAL_RECONNECT_MS, MAX_RECONNECT_MS } from "./reconnect.js";
-import { applyModsToChar, cursorSeq, tildeSeq } from "./keys.js";
-import { requestToggleDrawer } from "./drawer.js";
-import { paneTitleAttr, paneTitleHtml, type AttachInfo } from "./paneTitle.js";
-import type { PaneConnection } from "./pane.js";
-import type { ClientControl, Uuid } from "./types.js";
-import { WebglPolicy } from "./webglRenderer.js";
-
-export type { AttachInfo } from "./paneTitle.js";
-
-/** One budget for the whole page — see webglRenderer.ts for why contexts are
- *  rationed rather than handed to every connection. */
-const webglPolicy = new WebglPolicy();
-
-/**
- * A single live attach: an xterm terminal bound to the daemon's attach WebSocket.
- *
- * The connection is **decoupled from the UI**: it owns a long-lived WS that
- * keeps streaming PTY output into the terminal buffer whether or not the view
- * is currently mounted. The shell moves `el` between the visible content pane
- * and a hidden cache; `onMount`/`onUnmount` only adjust focus + sizing, never
- * the connection. Only `dispose()` (eviction, an explicit disconnect, or the
- * session ending) tears the socket down — so switching away and back is
- * instant, with scrollback already in place.
- */
-export interface AttachConnection extends PaneConnection {}
-
-export interface AttachOptions {
-  /** Invoked when the user clicks the view's explicit "disconnect" control. */
-  onRequestClose?: (sessionId: Uuid) => void;
-  /** Invoked when the socket closes on its own — the session ended or the link
-   *  dropped — but NOT on an intentional `dispose()` (eviction / user close). The
-   *  shell uses this to auto-close the pane rather than leave a dead one. */
-  onClosed?: (sessionId: Uuid) => void;
-  /** Asked on every close: should the socket be retried? The shell answers
-   *  from the catalog — see `shouldRetryClose`. */
-  shouldReconnect?: (sessionId: Uuid, code: number) => boolean;
-}
-
-export function createAttachConnection(
-  sessionId: Uuid,
-  opts: AttachOptions = {},
-  info?: AttachInfo,
-): AttachConnection {
-  const el = document.createElement("div");
-  el.className = "attach";
-  // Useful identity over a bare UUID: name · command. The full id stays in the
-  // tooltip for when you really need it.
-  const titleHtml = paneTitleHtml(sessionId, info);
-  const titleAttr = paneTitleAttr(sessionId, info);
-  el.innerHTML = `
-    <header class="attach-header">
-      <button type="button" class="btn btn-ghost btn-icon sessions-btn" aria-label="Show sessions" title="Show sessions">☰</button>
-      <span class="attach-title" title="${titleAttr}">${titleHtml}</span>
-      <span class="attach-state" data-state="connecting">connecting…</span>
-      <button class="btn btn-ghost btn-icon disconnect" type="button" aria-label="Disconnect" title="Disconnect this session">⏻</button>
-    </header>
-    <div class="attach-body"></div>
-  `;
-
-  const titleEl = el.querySelector(".attach-title") as HTMLSpanElement;
-  const body = el.querySelector(".attach-body") as HTMLDivElement;
-  const stateEl = el.querySelector(".attach-state") as HTMLSpanElement;
-  const disconnectBtn = el.querySelector(".disconnect") as HTMLButtonElement;
-
-  const keybar = buildKeyBar((data) => sendInput(data));
-  el.appendChild(keybar.el);
-
-  const setState = (s: string, kind: "connecting" | "open" | "closed" | "error") => {
-    stateEl.textContent = s;
-    stateEl.dataset.state = kind;
-  };
-
-  // Mobile-only (CSS hides it on desktop, where the sidebar is always in view):
-  // the session list is an off-canvas drawer and this is what opens it.
-  (el.querySelector(".sessions-btn") as HTMLElement).addEventListener("click", () =>
-    requestToggleDrawer(),
-  );
-
-  disconnectBtn.addEventListener("click", () => {
-    opts.onRequestClose?.(sessionId);
-  });
-
-  const term = new Terminal({
-    cursorBlink: true,
-    fontFamily:
-      '"JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace',
-    fontSize: 13,
-    convertEol: false,
-    theme: {
-      // The terminal stays dark in both app themes (convention); colors are
-      // tuned to the maestro palette — signal-green cursor, slate background.
-      background: "#121419",
-      foreground: "#e6e8ec",
-      cursor: "#5fe3a1",
-      cursorAccent: "#121419",
-      selectionBackground: "#2b6b4f",
-    },
-    scrollback: 5000,
-    allowProposedApi: true,
-  });
-  const fit = new FitAddon();
-  term.loadAddon(fit);
-  term.open(body);
-
-  // GPU rendering is scoped to the mounted view, not the connection: acquired
-  // in onMount, released in onUnmount. See webglRenderer.ts.
-  let webgl: WebglAddon | null = null;
-  let dprMedia: MediaQueryList | null = null;
-
-  // The glyph atlas is rasterised for one device pixel ratio. Dragging the
-  // window to a display with a different one (or an Android browser-zoom
-  // change) leaves every cell blurry until the atlas is rebuilt.
-  const onDprChange = () => {
-    try {
-      term.clearTextureAtlas();
-    } catch {
-      // ignore — nothing to rebuild if the renderer already went away
-    }
-    watchDpr();
-  };
-
-  function watchDpr(): void {
-    dprMedia?.removeEventListener("change", onDprChange);
-    dprMedia = null;
-    try {
-      dprMedia = window.matchMedia?.(`(resolution: ${window.devicePixelRatio}dppx)`) ?? null;
-      dprMedia?.addEventListener("change", onDprChange);
-    } catch {
-      // ignore — a browser without `resolution` media queries just keeps the
-      // atlas it has, which is the pre-WebGL behaviour anyway
-    }
-  }
-
-  function releaseWebgl(): void {
-    dprMedia?.removeEventListener("change", onDprChange);
-    dprMedia = null;
-    if (!webgl) return;
-    const addon = webgl;
-    webgl = null;
-    try {
-      addon.dispose(); // xterm falls back to the DOM renderer
-    } catch {
-      // ignore — a lost context can throw on the way out
-    }
-  }
-
-  function acquireWebgl(): void {
-    if (webgl || disposed || !webglPolicy.enabled()) return;
-    try {
-      const addon = new WebglAddon();
-      // Context loss is routine on Android — backgrounding the tab is enough.
-      // Drop back to the DOM renderer, then retry only while the shared budget
-      // allows and this view is still the one on screen.
-      addon.onContextLoss(() => {
-        webglPolicy.noteContextLoss();
-        releaseWebgl();
-        if (mounted) acquireWebgl();
-      });
-      term.loadAddon(addon);
-      webgl = addon;
-      watchDpr();
-    } catch {
-      // Context creation failed outright (no GPU, or the browser is already at
-      // its context cap). Count it like a loss so we stop asking, and stay on
-      // the DOM renderer.
-      webglPolicy.noteContextLoss();
-      webgl = null;
-    }
-  }
-
-  // Touch scrolling: xterm's built-in touch handling is jittery (drags crawl a
-  // line at a time and stall), so map finger drags ourselves. Two routes:
-  //   • normal buffer  → term.scrollLines walks the scrollback.
-  //   • mouse-tracking apps (tmux, Claude Code on the alt screen) → synthesize
-  //     wheel events so xterm encodes them as mouse-wheel reports the app reads,
-  //     scrolling *its* content (the only scroll that exists on the alt screen).
-  //   • alt screen with no mouse tracking → nothing to do; the app owns input.
-  // `touch-action: none` (CSS) keeps the browser from cancelling the custom
-  // gesture stream; only the terminal surface opts out of native page panning.
-  // Listeners MUST sit on `.xterm`, not `.xterm-viewport`: `.xterm-screen` is a
-  // later sibling of the viewport, so it paints over it and takes every touch.
-  {
-    const root = term.element as HTMLElement | undefined;
-    const screen = el.querySelector(".xterm-screen") as HTMLElement | null;
-    const cellH = () => {
-      const core = (term as unknown as {
-        _core?: { _renderService?: { dimensions?: { css?: { cell?: { height: number } } } } };
-      })._core;
-      return core?._renderService?.dimensions?.css?.cell?.height || 16;
-    };
-    if (root) {
-      let lastY = 0;
-      let lastX = 0;
-      let remainder = 0;
-      root.addEventListener(
-        "touchstart",
-        (e) => {
-          if (e.touches.length !== 1) return;
-          lastY = e.touches[0].clientY;
-          lastX = e.touches[0].clientX;
-          remainder = 0;
-        },
-        { passive: true },
-      );
-      root.addEventListener(
-        "touchmove",
-        (e) => {
-          if (e.touches.length !== 1) return;
-          const ch = cellH();
-          const y = e.touches[0].clientY;
-          const px = lastY - y + remainder; // finger up → scroll toward newer
-          lastY = y;
-          const lines = Math.trunc(px / ch);
-          remainder = px - lines * ch;
-          if (lines === 0) return;
-          // term.modes.mouseTrackingMode is "none" unless the app turned mouse
-          // reporting on — that's the signal to forward instead of scrollback.
-          const mouseTracked = term.modes.mouseTrackingMode !== "none";
-          if (mouseTracked && screen) {
-            // One wheel event per crossed cell, dispatched at the touch point so
-            // xterm computes valid cell coords for the mouse report.
-            const dir = lines > 0 ? 1 : -1;
-            for (let i = 0; i < Math.abs(lines); i++) {
-              screen.dispatchEvent(
-                new WheelEvent("wheel", {
-                  deltaY: dir * ch,
-                  deltaMode: 0,
-                  clientX: lastX,
-                  clientY: y,
-                  bubbles: true,
-                  cancelable: true,
-                }),
-              );
-            }
-            e.preventDefault();
-          } else if (term.buffer.active.type !== "alternate") {
-            term.scrollLines(lines);
-            e.preventDefault();
-          }
-        },
-        { passive: false },
-      );
-    }
-  }
-
-  // Mobile: the special-key bar is only useful while the soft keyboard is up,
-  // so reveal it only when the terminal's hidden textarea is focused (CSS still
-  // gates it to coarse pointers). Tapping a keycap keeps focus via pointerdown
-  // preventDefault, so the bar stays put during use. Re-fit on the toggle since
-  // showing/hiding the bar changes the terminal's available height.
-  const ta = term.textarea;
-  if (ta) {
-    ta.addEventListener("focus", () => {
-      keybar.el.classList.add("keybar-active");
-      requestAnimationFrame(tryFit);
-    });
-    ta.addEventListener("blur", () => {
-      keybar.el.classList.remove("keybar-active");
-      requestAnimationFrame(tryFit);
-    });
-  }
-
-  let mounted = false;
-  // A previewed pane is visible but must not steal the keyboard from the
-  // sidebar, so mounting can opt out of the focus grab (and out of the one
-  // the socket does when it finishes connecting).
-  let focusOnMount = true;
-  // We compute the fit ourselves instead of FitAddon.fit(): the addon subtracts
-  // a scrollbar width that xterm reports as `offsetWidth - scrollArea || 15`,
-  // so with the scrollbar hidden it falls back to a phantom 15px and the grid
-  // stops ~1–2 columns short of the edge. Same math, minus that subtraction.
-  const tryFit = () => {
-    if (!mounted) return; // parked views have no meaningful size to fit to
-    try {
-      const el2 = term.element;
-      const parent = el2?.parentElement;
-      const core = (term as unknown as {
-        _core?: { _renderService?: { dimensions?: { css?: { cell?: { width: number; height: number } } } } };
-      })._core;
-      const cell = core?._renderService?.dimensions?.css?.cell;
-      if (!el2 || !parent || !cell || !cell.width || !cell.height) {
-        fit.fit(); // fall back if internals aren't ready yet
-        return;
-      }
-      // Measure the viewport's real inner width (clientWidth excludes any
-      // scrollbar), not the container's — so columns always fit inside the
-      // viewport whether or not xterm reserves a scrollbar. Falls back to the
-      // padded container box before the viewport exists.
-      const vp = el2.querySelector(".xterm-viewport") as HTMLElement | null;
-      let availW: number;
-      let availH: number;
-      if (vp && vp.clientWidth > 0) {
-        availW = vp.clientWidth;
-        availH = vp.clientHeight;
-      } else {
-        const ps = getComputedStyle(parent);
-        const ts = getComputedStyle(el2);
-        availW =
-          parseInt(ps.width) -
-          (parseInt(ts.paddingLeft) + parseInt(ts.paddingRight) || 0);
-        availH =
-          parseInt(ps.height) -
-          (parseInt(ts.paddingTop) + parseInt(ts.paddingBottom) || 0);
-      }
-      const cols = Math.max(2, Math.floor(availW / cell.width));
-      const rows = Math.max(1, Math.floor(availH / cell.height));
-      if (cols !== term.cols || rows !== term.rows) term.resize(cols, rows);
-    } catch {
-      try {
-        fit.fit();
-      } catch {
-        // ignore — fit fails if the container is detached or zero-sized
-      }
-    }
-  };
-
-  let ws: WebSocket;
-  let reconnectMs = INITIAL_RECONNECT_MS;
-  let reconnectTimer: number | null = null;
-  // Snapshot replay starts at row zero, which can leave Codex at its oldest line.
-  // Follow it once per socket; later scrolling remains under the operator's control.
-  let awaitingReplay = true;
-
-  const sendControl = (msg: ClientControl) => {
-    if (ws.readyState !== WebSocket.OPEN) return;
-    ws.send(JSON.stringify(msg));
-  };
-
-  /** PTY input: raw bytes out as a binary frame. Shared by keystrokes and the
-   *  mobile key bar so both flow through the same path. */
-  const sendInput = (data: string) => {
-    if (ws.readyState !== WebSocket.OPEN) return;
-    ws.send(new TextEncoder().encode(data));
-  };
-
-  const onResize = () => {
-    tryFit();
-    sendControl({ type: "Resize", cols: term.cols, rows: term.rows });
-  };
-
-  function connect(): void {
-    awaitingReplay = true;
-    ws = new WebSocket(attachWsUrl(sessionId));
-    ws.binaryType = "arraybuffer";
-
-    ws.onopen = () => {
-      reconnectMs = INITIAL_RECONNECT_MS;
-      setState("connected", "open");
-      sendControl({ type: "Resize", cols: term.cols, rows: term.rows });
-      if (mounted && focusOnMount) term.focus();
-    };
-
-    ws.onmessage = (ev) => {
-      if (typeof ev.data === "string") {
-        try {
-          JSON.parse(ev.data) as ClientControl;
-        } catch {
-          // ignore unknown control frames
-        }
-        return;
-      }
-      if (ev.data instanceof ArrayBuffer) {
-        const replay = awaitingReplay;
-        awaitingReplay = false;
-        term.write(new Uint8Array(ev.data), () => {
-          if (replay) term.scrollToBottom();
-        });
-      } else if (ev.data instanceof Blob) {
-        // Some browsers may default to Blob despite binaryType="arraybuffer".
-        void ev.data.arrayBuffer().then((b) => {
-          const replay = awaitingReplay;
-          awaitingReplay = false;
-          term.write(new Uint8Array(b), () => {
-            if (replay) term.scrollToBottom();
-          });
-        });
-      }
-    };
-
-    ws.onerror = () => {
-      setState("error", "error");
-    };
-
-    ws.onclose = (ev) => {
-      // The web proxy relays a daemon rejection (unknown session) as an
-      // application close code (4000+) carrying a human reason. Show it in the
-      // pane — both the header and the terminal body — and KEEP the pane up so
-      // the user can read why, instead of letting it flash and vanish (#39).
-      const reason = ev.reason?.trim();
-      if (ev.code >= 4000 && reason && !disposed) {
-        setState(reason, "error");
-        term.write(`\r\n\x1b[31m⚠ cannot attach: ${reason}\x1b[0m\r\n`);
-        return;
-      }
-      // An intentional dispose has already set `disposed`; eviction and user
-      // close handle their own pane teardown.
-      if (disposed) return;
-
-      if (opts.shouldReconnect?.(sessionId, ev.code)) {
-        const delay = Math.min(reconnectMs, MAX_RECONNECT_MS);
-        setState("reconnecting…", "connecting");
-        reconnectTimer = window.setTimeout(() => {
-          reconnectTimer = null;
-          reconnectMs = Math.min(reconnectMs * 2, MAX_RECONNECT_MS);
-          connect();
-        }, delay);
-        return;
-      }
-
-      setState(`closed (${ev.code})`, "closed");
-      opts.onClosed?.(sessionId);
-    };
-  }
-
-  connect();
-
-  // PTY input: every keystroke goes out as a binary frame. A pending key-bar
-  // Ctrl modifier (mobile) folds into the next typed character here.
-  const dataDisp = term.onData((data) => {
-    sendInput(keybar.consume(data));
-  });
-  const resizeDisp = term.onResize(({ cols, rows }) => {
-    sendControl({ type: "Resize", cols, rows });
-  });
-  // xterm has no built-in copy-on-select; mirror the selection to the
-  // clipboard ourselves (best-effort — insecure contexts lack the API).
-  const selectionDisp = term.onSelectionChange(() => {
-    const text = term.getSelection();
-    if (text) void navigator.clipboard?.writeText(text).catch(() => {});
-  });
-
-  window.addEventListener("resize", onResize);
-  const visual = window.visualViewport ?? null;
-  visual?.addEventListener("resize", onResize);
-
-  // FitAddon only recomputes on the events we call it from — a window resize
-  // misses container-driven changes (sidebar drag, mobile layout settling,
-  // orientation, late font load). Observe the body directly so columns always
-  // match the real rendered width and the terminal fills edge to edge.
-  const ro = new ResizeObserver(() => tryFit());
-  ro.observe(body);
-  // Re-fit once the monospace font is actually loaded — cell width changes when
-  // the fallback is swapped out, which otherwise leaves stale columns.
-  document.fonts?.ready?.then(() => tryFit()).catch(() => {});
-
-  let disposed = false;
-
-  return {
-    sessionId,
-    el,
-    onMount(mountOpts?: { focus?: boolean }) {
-      mounted = true;
-      focusOnMount = mountOpts?.focus !== false;
-      acquireWebgl();
-      // Defer a tick so the element has its content-pane dimensions before fit.
-      requestAnimationFrame(() => {
-        tryFit();
-        sendControl({ type: "Resize", cols: term.cols, rows: term.rows });
-        if (focusOnMount && ws.readyState === WebSocket.OPEN) term.focus();
-      });
-    },
-    onUnmount() {
-      mounted = false;
-      // Parked views hand their GPU context back: the browser's cap is small
-      // (smaller still on Android) and MAX_PARKED connections outlive the pane.
-      releaseWebgl();
-    },
-    focusTerminal() {
-      term.focus();
-    },
-    // The closure above: the same bytes-out path keystrokes and the mobile key
-    // bar already take.
-    sendInput,
-    updateInfo(next: AttachInfo) {
-      titleEl.innerHTML = paneTitleHtml(sessionId, next);
-      titleEl.title = paneTitleAttr(sessionId, next);
-    },
-    dispose() {
-      if (disposed) return;
-      disposed = true;
-      if (reconnectTimer !== null) {
-        window.clearTimeout(reconnectTimer);
-        reconnectTimer = null;
-      }
-      ro.disconnect();
-      window.removeEventListener("resize", onResize);
-      visual?.removeEventListener("resize", onResize);
-      dataDisp.dispose();
-      resizeDisp.dispose();
-      selectionDisp.dispose();
-      releaseWebgl();
-      try {
-        ws.close();
-      } catch {
-        // ignore
-      }
-      term.dispose();
-      el.remove();
-    },
-  };
-}
-
-/**
- * One key in the mobile key bar.
- * - `mod` is a sticky one-shot modifier toggle (Ctrl / Alt).
- * - `cursor` is a cursor/navigation key, identified by its CSI final byte, so a
- *   pending modifier can promote it to the `\x1b[1;<n><final>` form.
- * - `tilde` is a `~`-terminated navigation key (PgUp/PgDn), identified by its
- *   CSI parameter, whose modified form is `\x1b[<code>;<n>~`.
- * - `char` is a literal character (the symbols the soft keyboard buries behind
- *   a page switch), folded through a pending modifier like typed input.
- * - `seq` is a plain key (Esc, Tab) sent verbatim.
- */
-type KeyDef =
-  | { label: string; mod: Modifier }
-  | { label: string; cursor: CursorFinal }
-  | { label: string; tilde: number }
-  | { label: string; char: string }
-  | { label: string; seq: string };
-
-type Modifier = "ctrl" | "alt";
-/** CSI final bytes: arrows A–D, Home `H`, End `F`. */
-type CursorFinal = "A" | "B" | "C" | "D" | "H" | "F";
-
-/**
- * The keys the mobile soft keyboard hides, ordered to flow row-major into an
- * 8-column / 2-row grid (#7):
- *
- *     Esc  Tab  Home  ↑   End  PgUp  -  /
- *     Ctrl Alt   ←    ↓    →   PgDn  |  ~
- *
- * — Esc/Tab + the Ctrl/Alt sticky modifiers on the left, the cursor keys as a
- * real-keyboard inverted-T in the middle with Home/End filling its top corners,
- * then the paging pair and the shell symbols that cost a soft-keyboard page
- * switch to reach. Narrower screens scroll the bar sideways rather than
- * shrinking the caps below a thumb's width.
- */
-const KEY_DEFS: KeyDef[] = [
-  { label: "Esc", seq: "\x1b" },
-  { label: "Tab", seq: "\t" },
-  { label: "Home", cursor: "H" },
-  { label: "↑", cursor: "A" },
-  { label: "End", cursor: "F" },
-  { label: "PgUp", tilde: 5 },
-  { label: "-", char: "-" },
-  { label: "/", char: "/" },
-  { label: "Ctrl", mod: "ctrl" },
-  { label: "Alt", mod: "alt" },
-  { label: "←", cursor: "D" },
-  { label: "↓", cursor: "B" },
-  { label: "→", cursor: "C" },
-  { label: "PgDn", tilde: 6 },
-  { label: "|", char: "|" },
-  { label: "~", char: "~" },
-];
-
-/**
- * Fold a single character into its control code: letters and `@[\]^_` map to
- * 0x00–0x1f, space → NUL, `?` → DEL. Anything else is returned unchanged.
- */
-interface KeyBar {
-  readonly el: HTMLElement;
-  /** Fold pending modifiers into typed input (soft keyboard), consuming them. */
-  consume(data: string): string;
-}
-
-/**
- * Build the Termux-style special-key bar. Hidden by default; CSS reveals it on
- * coarse-pointer (touch) devices. `send` delivers bytes to the PTY.
- *
- * Ctrl and Alt are one-shot sticky modifiers: arm them and the very next key —
- * tapped here or typed on the soft keyboard — carries the modifier, then they
- * disarm. Taps `preventDefault` on pointerdown so the terminal keeps focus and
- * the keyboard stays open.
- */
-function buildKeyBar(send: (data: string) => void): KeyBar {
-  const el = document.createElement("div");
-  el.className = "attach-keybar";
-  el.setAttribute("role", "toolbar");
-  el.setAttribute("aria-label", "Special keys");
-
-  const armed: Record<Modifier, boolean> = { ctrl: false, alt: false };
-  const modBtns: Partial<Record<Modifier, HTMLButtonElement>> = {};
-
-  const setMod = (mod: Modifier, on: boolean) => {
-    armed[mod] = on;
-    modBtns[mod]?.setAttribute("aria-pressed", String(on));
-  };
-  const clearMods = () => {
-    setMod("ctrl", false);
-    setMod("alt", false);
-  };
-
-  for (const def of KEY_DEFS) {
-    const btn = document.createElement("button");
-    btn.type = "button";
-    btn.className = "keycap";
-    btn.textContent = def.label;
-
-    if ("mod" in def) {
-      btn.classList.add("keycap-mod");
-      btn.setAttribute("aria-pressed", "false");
-      btn.setAttribute("aria-label", `${def.label} modifier`);
-      modBtns[def.mod] = btn;
-      btn.addEventListener("click", () => setMod(def.mod, !armed[def.mod]));
-    } else if ("cursor" in def) {
-      btn.addEventListener("click", () => {
-        send(cursorSeq(def.cursor, armed.ctrl, armed.alt));
-        clearMods();
-      });
-    } else if ("tilde" in def) {
-      btn.addEventListener("click", () => {
-        send(tildeSeq(def.tilde, armed.ctrl, armed.alt));
-        clearMods();
-      });
-    } else if ("char" in def) {
-      btn.addEventListener("click", () => {
-        send(applyModsToChar(def.char, armed.ctrl, armed.alt));
-        clearMods();
-      });
-    } else {
-      btn.addEventListener("click", () => {
-        send(def.seq);
-        clearMods();
-      });
-    }
-
-    // Keep the terminal focused (soft keyboard up) — don't let the tap steal it.
-    // preventDefault suppresses the native `:active` style, so flash an explicit
-    // press animation here for tactile feedback.
-    btn.addEventListener("pointerdown", (e) => {
-      e.preventDefault();
-      btn.classList.remove("is-pressed");
-      void btn.offsetWidth; // restart the animation if re-tapped mid-flash
-      btn.classList.add("is-pressed");
-    });
-    btn.addEventListener("animationend", () => btn.classList.remove("is-pressed"));
-    el.appendChild(btn);
-  }
-
-  return {
-    el,
-    consume(data: string): string {
-      if ((armed.ctrl || armed.alt) && data.length === 1) {
-        const out = applyModsToChar(data, armed.ctrl, armed.alt);
-        clearMods();
-        return out;
-      }
-      return data;
-    },
-  };
-}

web/src/barActions.test.ts

@@ -1,139 +0,0 @@
-// @vitest-environment happy-dom
-//
-// The sidebar's half of the command bar's action page (#151): the bar picks
-// kill or rename and raises the flow the card already has, so what the page
-// runs is what the ✕ button and the `r` key run.
-import { afterEach, beforeAll, describe, expect, it } from "vitest";
-
-import { KILL_SESSION_EVENT, RENAME_SESSION_EVENT, renderSidebar } from "./catalog.js";
-import type { CatalogListener, CatalogStore } from "./events.js";
-import type { Session } from "./types.js";
-
-beforeAll(() => {
-  Object.defineProperty(window, "localStorage", {
-    value: { getItem: () => null, setItem: () => {} },
-  });
-});
-
-let mounted: { el: HTMLElement; dispose: () => void } | null = null;
-
-afterEach(() => {
-  document.querySelector(".kill-dialog")?.remove();
-  mounted?.dispose();
-  mounted = null;
-  document.body.replaceChildren();
-});
-
-function session(overrides: Partial<Session> = {}): Session {
-  return {
-    id: "aaaaaaaa-0000-0000-0000-0000000000ff",
-    cwd: "/home/naps/tea/maestro",
-    command: "claude",
-    env: {},
-    metadata: { name: "amber-falcon" },
-    status: "Running",
-    created_at: "2026-08-24T10:00:00Z",
-    ...overrides,
-  };
-}
-
-function storeWith(sessions: Session[]): CatalogStore {
-  const state = { sessions: new Map(sessions.map((s) => [s.id, s])) };
-  return {
-    snapshot: () => state,
-    subscribe: (fn: CatalogListener) => {
-      fn(state);
-      return () => {};
-    },
-  } as unknown as CatalogStore;
-}
-
-function mount(s: Session): HTMLElement {
-  const handle = renderSidebar(storeWith([s]));
-  mounted = handle;
-  document.body.appendChild(handle.el);
-  return handle.el;
-}
-
-function raise(name: string, s: Session): void {
-  document.dispatchEvent(new CustomEvent(name, { detail: s }));
-}
-
-/** Let the kill chain's awaits (fetch, its json body) settle. */
-async function flush(): Promise<void> {
-  for (let i = 0; i < 8; i++) await Promise.resolve();
-}
-
-describe("kill from the action page", () => {
-  it("goes through the same confirmation the sidebar raises (#160)", async () => {
-    const calls: string[] = [];
-    window.fetch = ((url: string, init?: RequestInit) => {
-      calls.push(`${init?.method ?? "GET"} ${url}`);
-      return Promise.resolve(new Response(null, { status: 204 }));
-    }) as typeof fetch;
-    const s = session();
-    mount(s);
-    raise(KILL_SESSION_EVENT, s);
-    await flush();
-    expect(document.querySelector(".kill-dialog")?.getAttribute("aria-label")).toBe(
-      "Kill amber-falcon",
-    );
-    expect(calls.filter((c) => c.startsWith("DELETE"))).toHaveLength(0);
-    document.querySelector<HTMLButtonElement>(".kill-dialog-kill")?.click();
-    await flush();
-    expect(calls).toContain(`DELETE /api/sessions/${s.id}`);
-    expect(document.querySelector(".kill-dialog")).toBeNull();
-  });
-
-  it("raises the existing confirm-and-blockers dialog on a guarded refusal", async () => {
-    window.fetch = ((url: string) => {
-      if (String(url).includes("force=true")) {
-        return Promise.resolve(new Response(null, { status: 204 }));
-      }
-      return Promise.resolve(
-        new Response(
-          JSON.stringify({
-            error: {
-              code: "kill_guarded",
-              message: "worktree has unsaved work",
-              unsaved_work: { untracked_files: 1 },
-            },
-          }),
-          { status: 409, headers: { "content-type": "application/json" } },
-        ),
-      );
-    }) as typeof fetch;
-    const s = session({ blocked_work: { untracked_files: 1 } });
-    mount(s);
-    raise(KILL_SESSION_EVENT, s);
-    await flush();
-    document.querySelector<HTMLButtonElement>(".kill-dialog-kill")?.click();
-    await flush();
-    const dialog = document.querySelector(".kill-dialog");
-    expect(dialog?.getAttribute("aria-label")).toBe("Kill amber-falcon");
-    expect(dialog?.textContent).toContain("1 untracked file");
-  });
-});
-
-describe("rename from the action page", () => {
-  it("expands the folder hiding the card, since the prompt lives in the card", () => {
-    window.fetch = (() => Promise.reject(new Error("offline"))) as typeof fetch;
-    const s = session();
-    const el = mount(s);
-    const folder = el.querySelector<HTMLElement>(".tree-folder-header");
-    folder?.click();
-    expect(el.querySelector(`[data-session-id="${s.id}"]`)).toBeNull();
-    raise(RENAME_SESSION_EVENT, s);
-    expect(el.querySelector<HTMLInputElement>(".leaf-rename")?.value).toBe("amber-falcon");
-  });
-
-  it("raises the card's own prompt, pre-filled with the session's name", () => {
-    window.fetch = (() => Promise.reject(new Error("offline"))) as typeof fetch;
-    const s = session();
-    const el = mount(s);
-    raise(RENAME_SESSION_EVENT, s);
-    const input = el.querySelector<HTMLInputElement>(".leaf-rename");
-    expect(input?.value).toBe("amber-falcon");
-    expect(input?.getAttribute("aria-label")).toBe("Rename amber-falcon");
-  });
-});

web/src/catalog.test.ts

@@ -1,440 +0,0 @@
-// @vitest-environment happy-dom
-import { afterEach, beforeAll, describe, expect, it } from "vitest";
-
-import { renderSidebar } from "./catalog.js";
-import type { CatalogListener, CatalogStore } from "./events.js";
-import type { InTheWay, Session } from "./types.js";
-
-// happy-dom runs without a backing store; renderSidebar reads the persisted
-// sidebar width on mount.
-beforeAll(() => {
-  Object.defineProperty(window, "localStorage", {
-    value: { getItem: () => null, setItem: () => {} },
-  });
-  // No daemon here; renderSidebar treats a failed info fetch as "absolute
-  // paths are a fine fallback".
-  window.fetch = () => Promise.reject(new Error("offline"));
-});
-
-afterEach(() => {
-  document.querySelector(".kill-dialog")?.remove();
-});
-
-function session(overrides: Partial<Session>): Session {
-  return {
-    id: "11111111-2222-3333-4444-555555555555",
-    cwd: "/home/naps/tea/maestro",
-    command: "claude",
-    env: {},
-    metadata: {},
-    status: "Running",
-    created_at: "2026-08-24T10:00:00Z",
-    ...overrides,
-  };
-}
-
-function storeWith(sessions: Session[]): CatalogStore {
-  const state = { sessions: new Map(sessions.map((s) => [s.id, s])) };
-  return {
-    snapshot: () => state,
-    // Like the real store, deliver an immediate snapshot so the sidebar
-    // renders its rows during construction.
-    subscribe: (fn: CatalogListener) => {
-      fn(state);
-      return () => {};
-    },
-  } as unknown as CatalogStore;
-}
-
-function rowFor(el: HTMLElement, id: string): HTMLElement | null {
-  return el.querySelector<HTMLElement>(`[data-session-id="${id}"]`);
-}
-
-/** Let the kill chain's awaits (fetch, its json body) settle. */
-async function flush(): Promise<void> {
-  for (let i = 0; i < 8; i++) await Promise.resolve();
-}
-
-describe("blocked-work indicator (#83)", () => {
-  it("marks the row of a blocked session in diff notation", () => {
-    const blocked = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000001",
-      blocked_work: {
-        uncommitted_files: 3,
-        unpushed_commits: 2,
-        insertions: 124,
-        deletions: 18,
-      },
-    });
-    const el = renderSidebar(storeWith([blocked])).el;
-    const badge = rowFor(el, blocked.id)?.querySelector(".leaf-blocked");
-    expect(badge?.textContent).toBe("+124-18↑2");
-    // The spelled-out breakdown survives in the tooltip.
-    expect(badge?.getAttribute("title")).toContain(
-      "3 uncommitted files, 2 unpushed commits",
-    );
-  });
-
-  it("falls back to the file count when tracked changes carry no lines", () => {
-    const blocked = session({
-      id: "aaaaaaaa-0000-0000-0000-00000000001a",
-      blocked_work: { uncommitted_files: 2, untracked_files: 1 },
-    });
-    const el = renderSidebar(storeWith([blocked])).el;
-    const badge = rowFor(el, blocked.id)?.querySelector(".leaf-blocked");
-    expect(badge?.textContent).toBe("~2?1");
-  });
-
-  it("does not mark clear or unprobed sessions", () => {
-    const clear = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000002",
-      blocked_work: {} as InTheWay,
-    });
-    const unprobed = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000003",
-    });
-    const el = renderSidebar(storeWith([clear, unprobed])).el;
-    expect(rowFor(el, clear.id)?.querySelector(".leaf-blocked")).toBeNull();
-    expect(rowFor(el, unprobed.id)?.querySelector(".leaf-blocked")).toBeNull();
-  });
-
-  it("confirms before an unguarded kill (#160)", async () => {
-    const calls: string[] = [];
-    window.fetch = ((url: string, init?: RequestInit) => {
-      calls.push(`${init?.method ?? "GET"} ${url}`);
-      return Promise.resolve(new Response(null, { status: 204 }));
-    }) as typeof fetch;
-    const plain = session({ id: "aaaaaaaa-0000-0000-0000-000000000005" });
-    const el = renderSidebar(storeWith([plain])).el;
-    rowFor(el, plain.id)?.querySelector<HTMLButtonElement>(".leaf-kill")?.click();
-    await flush();
-    const dialog = document.querySelector(".kill-dialog");
-    expect(dialog?.getAttribute("aria-label")).toBe("Kill claude");
-    expect(calls.filter((c) => c.startsWith("DELETE"))).toHaveLength(0);
-    dialog?.querySelector<HTMLButtonElement>(".kill-dialog-kill")?.click();
-    await flush();
-    expect(calls).toContain(`DELETE /api/sessions/${plain.id}`);
-    expect(document.querySelector(".kill-dialog")).toBeNull();
-  });
-
-  it("kills nothing when the confirmation is cancelled (#160)", async () => {
-    const calls: string[] = [];
-    window.fetch = ((url: string, init?: RequestInit) => {
-      calls.push(`${init?.method ?? "GET"} ${url}`);
-      return Promise.resolve(new Response(null, { status: 204 }));
-    }) as typeof fetch;
-    const plain = session({ id: "aaaaaaaa-0000-0000-0000-000000000007" });
-    const el = renderSidebar(storeWith([plain])).el;
-    rowFor(el, plain.id)?.querySelector<HTMLButtonElement>(".leaf-kill")?.click();
-    await flush();
-    document.querySelector<HTMLButtonElement>(".kill-dialog-cancel")?.click();
-    await flush();
-    expect(document.querySelector(".kill-dialog")).toBeNull();
-    expect(calls.filter((c) => c.startsWith("DELETE"))).toHaveLength(0);
-  });
-
-  it("names the blockers in the confirmation, before the daemon refuses (#160)", async () => {
-    window.fetch = (() => Promise.reject(new Error("never called"))) as typeof fetch;
-    const blocked = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000008",
-      blocked_work: { untracked_files: 1 },
-    });
-    const el = renderSidebar(storeWith([blocked])).el;
-    rowFor(el, blocked.id)?.querySelector<HTMLButtonElement>(".leaf-kill")?.click();
-    await flush();
-    const dialog = document.querySelector(".kill-dialog");
-    expect(dialog?.textContent).toContain("1 untracked file");
-    expect(dialog?.textContent).toContain("refused unless it is forced");
-  });
-
-  it("offers the override when the daemon refuses a guarded kill", async () => {
-    const calls: string[] = [];
-    window.fetch = ((url: string, init?: RequestInit) => {
-      calls.push(`${init?.method ?? "GET"} ${url}`);
-      if (url.includes("force=true")) return Promise.resolve(new Response(null, { status: 204 }));
-      return Promise.resolve(
-        new Response(
-          JSON.stringify({
-            error: {
-              code: "kill_guarded",
-              message: "worktree has unsaved work",
-              unsaved_work: { untracked_files: 1 },
-            },
-          }),
-          { status: 409, headers: { "content-type": "application/json" } },
-        ),
-      );
-    }) as typeof fetch;
-    const blocked = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000004",
-      command: "bash",
-      blocked_work: { untracked_files: 1 },
-    });
-    const el = renderSidebar(storeWith([blocked])).el;
-    rowFor(el, blocked.id)?.querySelector<HTMLButtonElement>(".leaf-kill")?.click();
-    await flush();
-    document.querySelector<HTMLButtonElement>(".kill-dialog-kill")?.click();
-    await flush();
-    const dialog = document.querySelector(".kill-dialog");
-    expect(dialog?.textContent).toContain("1 untracked file");
-    dialog?.querySelector<HTMLButtonElement>(".kill-dialog-force")?.click();
-    await flush();
-    expect(calls).toContain(`DELETE /api/sessions/${blocked.id}?force=true`);
-    expect(document.querySelector(".kill-dialog")).toBeNull();
-  });
-
-  it("closes the override prompt without killing on cancel", async () => {
-    const calls: string[] = [];
-    window.fetch = ((url: string, init?: RequestInit) => {
-      calls.push(`${init?.method ?? "GET"} ${url}`);
-      return Promise.resolve(
-        new Response(
-          JSON.stringify({
-            error: { code: "kill_guarded", message: "worktree has unsaved work" },
-          }),
-          { status: 409, headers: { "content-type": "application/json" } },
-        ),
-      );
-    }) as typeof fetch;
-    const blocked = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000006",
-      blocked_work: { unpushed_commits: 2 },
-    });
-    const el = renderSidebar(storeWith([blocked])).el;
-    rowFor(el, blocked.id)?.querySelector<HTMLButtonElement>(".leaf-kill")?.click();
-    await flush();
-    document.querySelector<HTMLButtonElement>(".kill-dialog-kill")?.click();
-    await flush();
-    document.querySelector<HTMLButtonElement>(".kill-dialog-cancel")?.click();
-    expect(document.querySelector(".kill-dialog")).toBeNull();
-    expect(calls.filter((c) => c.includes("force=true"))).toHaveLength(0);
-  });
-});
-
-describe("agent-reported detail (#112)", () => {
-  const ago = (ms: number): string => new Date(Date.now() - ms).toISOString();
-
-  it("renders the reported detail right after the duration on line 2", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000020",
-      status: "Dead",
-      activity: "Error",
-      activity_since: ago(90_000),
-      activity_detail: "cargo build failed",
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const line2 = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2");
-    expect(line2?.querySelector(".activity-detail")?.textContent).toBe("cargo build failed");
-    const order = [...line2!.children].map((c) => c.className);
-    expect(order.indexOf("activity-detail")).toBeGreaterThan(order.indexOf("activity-duration"));
-    expect(order.indexOf("activity-detail")).toBeLessThan(
-      order.findIndex((c) => c.startsWith("card-flag")),
-    );
-  });
-
-  it("omits the detail when no report is in force", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000021",
-      activity: "Active",
-      activity_since: ago(90_000),
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    expect(rowFor(el, s.id)?.querySelector(".activity-detail")).toBeNull();
-  });
-});
-
-describe("session cards (#107)", () => {
-  const ago = (ms: number): string => new Date(Date.now() - ms).toISOString();
-
-  it("keeps the name and the actions in the same flow line, actions reserving their width", () => {
-    const s = session({ id: "aaaaaaaa-0000-0000-0000-000000000010" });
-    const el = renderSidebar(storeWith([s])).el;
-    const line1 = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line1");
-    expect(line1).not.toBeNull();
-    // Same flex line ⇒ the name truncates before it can ever reach the buttons.
-    expect(line1?.querySelector(".leaf-name")).not.toBeNull();
-    expect(line1?.querySelector(".leaf-actions")).toBe(line1?.lastElementChild);
-  });
-
-  it("always renders line 2 for a freshly spawned session", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000011",
-      activity: "Active",
-      activity_since: ago(5_000),
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const row = rowFor(el, s.id);
-    const line2 = row?.querySelector<HTMLElement>(".card-line2");
-    expect(line2).not.toBeNull();
-    expect(row?.querySelector(".activity-rail")).not.toBeNull();
-    expect(line2?.querySelector(".activity-duration")).toBeNull();
-    expect(line2?.querySelector(".leaf-cmd")).not.toBeNull();
-  });
-
-  it("shows dot + floored duration once the state has been held past 30s", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000012",
-      activity: "Active",
-      activity_since: ago(4 * 60_000 + 30_000),
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const row = rowFor(el, s.id);
-    const line2 = row?.querySelector<HTMLElement>(".card-line2");
-    expect(line2?.dataset.activity).toBe("active");
-    expect(row?.querySelector(".activity-rail")).not.toBeNull();
-    expect(line2?.querySelector(".activity-duration")?.textContent).toBe("4m");
-  });
-
-  it("dims a name the daemon generated, until it settles (#131)", () => {
-    const generated = session({
-      id: "aaaaaaaa-0000-0000-0000-0000000000a1",
-      metadata: { name: "amber-falcon", name_source: "Generated" },
-    });
-    const haiku = session({
-      id: "aaaaaaaa-0000-0000-0000-0000000000a2",
-      metadata: { name: "sidebar-rail", name_source: "Haiku" },
-    });
-    const chosen = session({
-      id: "aaaaaaaa-0000-0000-0000-0000000000a3",
-      metadata: { name: "my-session", name_source: "User" },
-    });
-    // Named before `name_source` existed: settled, never dimmed.
-    const legacy = session({
-      id: "aaaaaaaa-0000-0000-0000-0000000000a4",
-      metadata: { name: "older-session" },
-    });
-
-    const el = renderSidebar(storeWith([generated, haiku, chosen, legacy])).el;
-    const provisional = (s: Session) =>
-      rowFor(el, s.id)?.querySelector(".leaf-name")?.classList.contains("is-provisional");
-    expect(provisional(generated)).toBe(true);
-    expect(provisional(haiku)).toBe(false);
-    expect(provisional(chosen)).toBe(false);
-    expect(provisional(legacy)).toBe(false);
-  });
-
-  it("renders the command as its tool icon when the tool is known", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-00000000001b",
-      command: "claude",
-      metadata: { name: "claude" },
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const cmd = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2 .leaf-cmd");
-    expect(cmd?.querySelector(".tool-icon")?.getAttribute("data-tool")).toBe("claude");
-    expect(cmd?.getAttribute("title")).toBe("claude");
-    // The icon said it all: no text left over.
-    expect(cmd?.querySelector(".leaf-cmd-rest")).toBeNull();
-  });
-
-  it("drops the command's arguments, keeping them in the tooltip", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-00000000001c",
-      command: "claude --dangerously-skip-permissions",
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const cmd = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2 .leaf-cmd");
-    expect(cmd?.querySelector(".tool-icon")?.getAttribute("data-tool")).toBe("claude");
-    expect(cmd?.querySelector(".leaf-cmd-rest")).toBeNull();
-    expect(cmd?.getAttribute("title")).toBe("claude --dangerously-skip-permissions");
-  });
-
-  it("keeps an unknown command as plain text", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-00000000001d",
-      command: "hx src/main.rs",
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const cmd = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2 .leaf-cmd");
-    expect(cmd?.querySelector(".tool-icon")).toBeNull();
-    expect(cmd?.querySelector(".leaf-cmd-rest")?.textContent).toBe("hx");
-    expect(cmd?.getAttribute("title")).toBe("hx src/main.rs");
-  });
-
-  it("maps each activity state to its contract slug", () => {
-    const mk = (id: string, activity: string) =>
-      session({
-        id,
-        activity: activity as Session["activity"],
-        status: "Running",
-        activity_since: ago(90_000),
-      });
-    const idle = mk("aaaaaaaa-0000-0000-0000-000000000013", "Idle");
-    const wait = mk("aaaaaaaa-0000-0000-0000-000000000014", "AwaitingInput");
-    const error = mk("aaaaaaaa-0000-0000-0000-000000000015", "Error");
-    const el = renderSidebar(storeWith([idle, wait, error])).el;
-    expect(rowFor(el, idle.id)?.querySelector(".card-line2")?.getAttribute("data-activity")).toBe(
-      "idle",
-    );
-    expect(rowFor(el, wait.id)?.querySelector(".card-line2")?.getAttribute("data-activity")).toBe(
-      "awaiting-input",
-    );
-    expect(rowFor(el, error.id)?.querySelector(".card-line2")?.getAttribute("data-activity")).toBe(
-      "error",
-    );
-  });
-
-  it("treats an unknown activity variant as idle instead of failing to render", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000016",
-      activity: "Teleported" as Session["activity"],
-      activity_since: ago(120_000),
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const line2 = rowFor(el, s.id)?.querySelector(".card-line2");
-    expect(line2?.getAttribute("data-activity")).toBe("idle");
-    expect(line2?.querySelector(".activity-duration")?.textContent).toBe("2m");
-  });
-
-  it("moves blocked work onto line 2 as diff notation", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000017",
-      blocked_work: {
-        uncommitted_files: 3,
-        unpushed_commits: 2,
-        insertions: 124,
-        deletions: 18,
-      },
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const line2 = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2");
-    expect(line2?.textContent).toContain("+124");
-    expect(line2?.textContent).toContain("-18");
-    // Line 1 carries no badges.
-    expect(rowFor(el, s.id)?.querySelector(".leaf-badge")).toBeNull();
-  });
-
-  it("shows exited on line 2 for dead sessions", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000018",
-      status: "Dead",
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const line2 = rowFor(el, s.id)?.querySelector<HTMLElement>(".card-line2");
-    expect(line2?.textContent).toContain("exited");
-  });
-
-  it("carries the state word only in tooltips and aria labels, never as text", () => {
-    const s = session({
-      id: "aaaaaaaa-0000-0000-0000-000000000019",
-      command: "claude",
-      metadata: { name: "worker" },
-      activity: "AwaitingInput",
-      activity_since: ago(90_000),
-    });
-    const el = renderSidebar(storeWith([s])).el;
-    const row = rowFor(el, s.id) as HTMLElement;
-    const rail = row.querySelector<HTMLElement>(".activity-rail");
-    expect(rail?.getAttribute("title")).toContain("Awaiting input");
-    expect(rail?.getAttribute("aria-label")).toContain("Awaiting input");
-    expect(row.textContent).not.toMatch(/awaiting.?input/i);
-  });
-
-  it("keeps the attach navigation and depth indentation", () => {
-    const s = session({ id: "aaaaaaaa-0000-0000-0000-00000000001a" });
-    const el = renderSidebar(storeWith([s])).el;
-    const row = rowFor(el, s.id) as HTMLAnchorElement;
-    expect(row.getAttribute("href")).toBe("#/attach/aaaaaaaa-0000-0000-0000-00000000001a");
-    expect(row.style.paddingLeft).toMatch(/^\d+(\.\d+)?px$/);
-  });
-});

web/src/catalog.ts

@@ -1,872 +0,0 @@
-import { escapeHtml } from "./html.js";
-import { ApiRequestError, getDaemonInfo, killSession, renameSession } from "./api.js";
-import { openForceKillDialog, openKillConfirmDialog } from "./killDialog.js";
-import { openContextMenu } from "./contextMenu.js";
-import { toggleHelp } from "./help.js";
-import { CommandSet, defineCommands } from "./commands.js";
-import { CatalogStore } from "./events.js";
-import type { InTheWay, Session } from "./types.js";
-import {
-  abbreviateCwd,
-  abbreviateFolderName,
-  blockerStats,
-  customSessionName,
-  formatInTheWay,
-  MAX_SESSION_NAME_LEN,
-  normalizeSessionName,
-  sessionBlockers,
-  isProvisionalName,
-  sessionName,
-  sessionTreePath,
-} from "./types.js";
-import { splitCommand, toolIconSvg } from "./toolIcon.js";
-import {
-  activityColorSlug,
-  activityDurationLabel,
-  activityHeldMs,
-  META_LINE_MIN_HOLD_MS,
-} from "./activity.js";
-import type { TreeNode } from "./tree.js";
-import { buildTree } from "./tree.js";
-import { createPaletteSelect, createThemeToggle } from "./theme.js";
-import type { DaemonLink } from "./daemonLink.js";
-import { createStatusIndicator } from "./statusIndicator.js";
-
-/** Ask the shell to open the spawn modal. Handled in main.ts, where the
- *  multi-view controller lives; dispatched from every Spawn affordance. */
-export const OPEN_SPAWN_EVENT = "catalog-open-spawn";
-export function requestOpenSpawn(): void {
-  document.dispatchEvent(new CustomEvent(OPEN_SPAWN_EVENT));
-}
-
-/** Ask the shell to open the command bar with an empty query. Dispatched by
- *  the sidebar's search field, which is the touch entry point to the bar
- *  (#157, docs/COMMAND-BAR.md "Touch entry"): there is no `ctrl-k` on a phone.
- *  Handled in main.ts, which owns the session snapshot the bar needs. */
-export const OPEN_COMMAND_BAR_EVENT = "catalog-open-command-bar";
-export function requestOpenCommandBar(): void {
-  document.dispatchEvent(new CustomEvent(OPEN_COMMAND_BAR_EVENT));
-}
-
-/** Ask the shell to hand the keyboard back to the focused pane's terminal —
- *  what Tab in the sidebar list does. Handled in main.ts, which owns the
- *  connection pool. */
-export const FOCUS_PANE_EVENT = "catalog-focus-pane";
-
-/** Ask the shell to open the spawn modal seeded from an existing session
- *  ("Spawn similar"). Detail is the session being cloned. */
-export const SPAWN_SIMILAR_EVENT = "catalog-spawn-similar";
-
-/** Ask the sidebar to kill a session — the command bar's action page picking
- *  `kill` (#151). Detail is the session. Handled here, so the kill goes
- *  through the same confirm-and-blockers flow the card's ✕ does
- *  (`docs/WORKTREES.md`); the bar never reimplements it. */
-export const KILL_SESSION_EVENT = "catalog-kill-session";
-
-/** Ask the sidebar to rename a session — the command bar's action page picking
- *  `rename` (#151). Detail is the session. The prompt is the card's own inline
- *  field, pre-filled with the session's name (`docs/SIDEBAR.md`). */
-export const RENAME_SESSION_EVENT = "catalog-rename-session";
-
-/** A session row was clicked (issue #133). The row's `href` drives normal
- *  hash navigation, but a split/drag can move focus without ever touching
- *  `location.hash` — so a click back onto a session whose hash still
- *  matches fires no `hashchange` and the app never hears about it. This
- *  event is the click-driven path that doesn't depend on the hash actually
- *  changing. */
-export const SESSION_SELECT_EVENT = "catalog-session-select";
-
-/** The rows a keyboard walk stops on, in visual (document) order. Expanded
- *  folder headers are skipped: a directory is not something to focus, and the
- *  cards under it are one row away anyway. A *collapsed* folder still counts —
- *  its header is the only row it has, so skipping it would leave the folder
- *  unreachable. Same rule as the TUI sidebar. */
-const NAV_SELECTOR = '.tree-leaf, .tree-folder-header[aria-expanded="false"]';
-
-const collapsed = new Set<string>();
-
-/** Session whose card is currently being renamed inline (#125). The tree
- * re-renders on every catalog delta, and an activity update arriving mid-edit
- * would otherwise replace the field the user is typing into. */
-let renamingId: string | null = null;
-
-// docs/SIDEBAR.md: the state word is never rendered — the rail's colour
-// carries it. It survives only in tooltips/aria labels so meaning is not
-// colour-only.
-const STATE_WORDS: Record<string, string> = {
-  active: "Active",
-  idle: "Idle",
-  "awaiting-input": "Awaiting input",
-  error: "Error",
-};
-
-/** docs/SIDEBAR.md: the activity rail is pinned to the row's own left edge,
- * full height. The row's own padding (`renderNode`) shifts outward with
- * nesting depth, carrying the rail with it. */
-function activityRailMarkup(slug: string, stateWord: string): string {
-  return `<span class="activity-rail" data-activity="${slug}" role="img" title="${escapeHtml(stateWord)}" aria-label="${escapeHtml(stateWord)}"></span>`;
-}
-
-function metaLine(s: Session, now: number): string {
-  const dead = s.status === "Dead";
-  const blockers = sessionBlockers(s);
-  const slug = activityColorSlug(s.activity ?? "Idle");
-  const held = activityHeldMs(s.activity_since, now);
-  const duration =
-    held !== null && held >= META_LINE_MIN_HOLD_MS ? activityDurationLabel(held) : null;
-
-  const fragments = [
-    duration ? `<span class="activity-duration">${duration}</span>` : "",
-    s.activity_detail
-      ? `<span class="activity-detail">${escapeHtml(s.activity_detail)}</span>`
-      : "",
-    commandFragment(s.command),
-    blockers ? blockedFragment(blockers) : "",
-    dead ? `<span class="card-flag">exited</span>` : "",
-  ];
-  return `<span class="card-line2" data-activity="${slug}">${fragments.join("")}</span>`;
-}
-
-/** docs/SIDEBAR.md: blocked work renders as diff notation — `+124 -18 ?3 ↑2`
- * — with the spelled-out breakdown kept in the tooltip. */
-function blockedFragment(blockers: InTheWay): string {
-  const stats = blockerStats(blockers)
-    .map((st) => `<span class="blocked-stat" data-stat="${st.kind}">${escapeHtml(st.text)}</span>`)
-    .join("");
-  const title = `Kill will be refused unless forced — ${formatInTheWay(blockers)}`;
-  return `<span class="card-flag leaf-blocked" title="${escapeHtml(title)}">${stats}</span>`;
-}
-
-/** docs/SIDEBAR.md: the card names the program only — arguments never reach
- * the card. The program becomes its tool icon when we have a mark for it, and
- * stays as its bare name when we do not. The full command line, arguments and
- * all, stays in the tooltip either way. */
-function commandFragment(command: string): string {
-  const { tool, program } = splitCommand(command);
-  const icon = tool ? toolIconSvg(tool) : null;
-  const text = icon ? "" : program;
-  return `<span class="card-flag leaf-cmd" title="${escapeHtml(command)}">${icon ?? ""}${text ? `<span class="leaf-cmd-rest">${escapeHtml(text)}</span>` : ""}</span>`;
-}
-
-function renderNode(node: TreeNode, depth: number): HTMLElement {
-  if (node.kind === "folder") {
-    const wrap = document.createElement("div");
-    wrap.className = "tree-folder";
-
-    if (node.name) {
-      const header = document.createElement("button");
-      header.type = "button";
-      header.className = "tree-folder-header";
-      header.style.paddingLeft = `${depth * 16}px`;
-      const isCollapsed = collapsed.has(node.path);
-      header.setAttribute("aria-expanded", String(!isCollapsed));
-      header.dataset.navKey = `folder:${node.path}`;
-      // Single down-chevron; CSS rotates it -90° (→ right) when collapsed, so the
-      // glyph and the rotation never fight each other.
-      // A deep path (`~/git.naps.pt/naps62/maestro`) collapses its leading
-      // segments to initials (`~/g/n/maestro`) so the dir name stays readable in
-      // a narrow sidebar; the full path lives in the tooltip.
-      header.innerHTML = `<span class="chevron">▾</span><span class="folder-name" title="${escapeHtml(node.name)}">${abbreviateFolderName(node.name)}</span>`;
-      header.addEventListener("click", () => {
-        if (collapsed.has(node.path)) collapsed.delete(node.path);
-        else collapsed.add(node.path);
-        // re-render handled by caller observing the store; trigger a refresh:
-        document.dispatchEvent(new CustomEvent("catalog-rerender"));
-      });
-      wrap.appendChild(header);
-      if (isCollapsed) return wrap;
-    }
-
-    for (const child of node.children) {
-      wrap.appendChild(renderNode(child, node.name ? depth + 1 : depth));
-    }
-    return wrap;
-  }
-
-  // The row outlives the snapshot it was built from: a refresh that changes
-  // nothing structural patches it in place rather than replacing it, so the
-  // handlers below have to read the current session, not the one captured here.
-  let cur = node.session;
-  const s = node.session;
-  const now = Date.now();
-  const row = document.createElement("a");
-  row.className = "tree-leaf session-card";
-  row.href = `#/attach/${encodeURIComponent(s.id)}`;
-  row.style.paddingLeft = `${depth * 16 + 8}px`;
-  row.dataset.sessionId = s.id;
-  row.dataset.navKey = `session:${s.id}`;
-  const running = s.status === "Running";
-  row.dataset.status = running ? "running" : "dead";
-  const name = sessionName(s);
-  const slug = activityColorSlug(s.activity ?? "Idle");
-  const stateWord = STATE_WORDS[slug] ?? STATE_WORDS.idle;
-  row.setAttribute(
-    "aria-label",
-    `${name}, ${running ? "running" : "exited"}, ${stateWord}`,
-  );
-  // docs/SIDEBAR.md: line 1 reserves action width, and line 2 is unconditional.
-  row.innerHTML = `
-    ${activityRailMarkup(slug, stateWord)}
-    <span class="card-line1">
-      <span class="leaf-name${isProvisionalName(s) ? " is-provisional" : ""}">${escapeHtml(name)}</span>
-      <span class="leaf-actions">
-        <button class="leaf-act leaf-clone" type="button" title="Spawn similar" aria-label="Spawn similar to ${escapeHtml(name)}">⧉</button>
-        <button class="leaf-act leaf-kill" type="button" title="Kill session" aria-label="Kill ${escapeHtml(name)}">✕</button>
-      </span>
-    </span>
-    ${metaLine(s, now)}
-  `;
-  const similarBtn = row.querySelector(".leaf-clone") as HTMLButtonElement;
-  similarBtn.addEventListener("click", (ev) => {
-    ev.preventDefault();
-    ev.stopPropagation();
-    document.dispatchEvent(new CustomEvent(SPAWN_SIMILAR_EVENT, { detail: cur }));
-  });
-  const killBtn = row.querySelector(".leaf-kill") as HTMLButtonElement;
-  killBtn.addEventListener("click", (ev) => {
-    ev.preventDefault();
-    ev.stopPropagation();
-    requestKill(cur, sessionName(cur));
-  });
-  row.addEventListener("click", () => {
-    document.dispatchEvent(new CustomEvent(SESSION_SELECT_EVENT, { detail: cur.id }));
-  });
-  row.addEventListener("contextmenu", (ev) => {
-    ev.preventDefault();
-    ev.stopPropagation();
-    openContextMenu(ev.clientX, ev.clientY, [
-      { label: "Rename…", onSelect: () => beginRename(row, cur) },
-      {
-        label: "Spawn similar",
-        onSelect: () =>
-          document.dispatchEvent(new CustomEvent(SPAWN_SIMILAR_EVENT, { detail: cur })),
-      },
-      {
-        label: "Kill session",
-        danger: true,
-        onSelect: () => requestKill(cur, sessionName(cur)),
-      },
-    ]);
-  });
-  leafPatches.set(row, (next) => {
-    cur = next;
-    const nextSlug = activityColorSlug(next.activity ?? "Idle");
-    const nextWord = STATE_WORDS[nextSlug] ?? STATE_WORDS.idle;
-    row.setAttribute(
-      "aria-label",
-      `${sessionName(next)}, ${next.status === "Running" ? "running" : "exited"}, ${nextWord}`,
-    );
-    const rail = row.querySelector(".activity-rail");
-    if (rail) rail.outerHTML = activityRailMarkup(nextSlug, nextWord);
-    const meta = row.querySelector(".card-line2");
-    if (meta) meta.outerHTML = metaLine(next, Date.now());
-  });
-  return row;
-}
-
-/** Refresh a standing card from a newer snapshot of its session, keeping the
- *  element (and so the pointer's `:hover`) exactly where it is. Registered by
- *  `renderNode`; only the bits `treeSignature` leaves out are rewritten. */
-const leafPatches = new WeakMap<HTMLElement, (s: Session) => void>();
-
-/**
- * Everything about the tree that a patch cannot fix up.
- *
- * The daemon re-sends a session on every activity, foreground or cwd shift —
- * a couple of times a minute per live session — and rebuilding the sidebar for
- * each one drops `:hover` from the row under the pointer. Refreshes whose
- * signature is unchanged are patched into the standing rows instead; anything
- * that moves, renames, appears or dies changes the signature and rebuilds.
- */
-function treeSignature(node: TreeNode): string {
-  if (node.kind === "folder") {
-    const head = `F:${node.name}:${node.path}:${collapsed.has(node.path)}`;
-    if (node.name && collapsed.has(node.path)) return head;
-    return `${head}(${node.children.map(treeSignature).join(",")})`;
-  }
-  const s = node.session;
-  return `L:${s.id}:${sessionName(s)}:${s.status}:${isProvisionalName(s)}`;
-}
-
-/**
- * Kill behind a confirmation (#160): a kill is destructive and unattended
- * agents live in these sessions, so the web asks first, the way the TUI always
- * has. The daemon decides the rest — it refuses a kill over a worktree holding
- * unsaved work, and that refusal needs a prompt the confirmation cannot give,
- * a forced kill. Anything else surfaces in the dialog that asked.
- */
-function requestKill(s: Session, name: string): void {
-  openKillConfirmDialog({
-    name,
-    blockers: sessionBlockers(s),
-    onKill: async () => {
-      try {
-        await killSession(s.id);
-      } catch (e) {
-        if (e instanceof ApiRequestError && e.code === "kill_guarded") {
-          openForceKillDialog({
-            name,
-            blockers: e.unsavedWork ?? sessionBlockers(s),
-            reason: e.detail,
-            onForce: () => killSession(s.id, true),
-          });
-          return;
-        }
-        throw e;
-      }
-    },
-  });
-}
-
-/**
- * Swap the card's name for a text field (#125). Enter commits, Escape and
- * blur cancel. An emptied field clears the name, so the card falls back to
- * the command — the same rule the spawn form's blank name field follows.
- */
-function beginRename(row: HTMLElement, s: Session): void {
-  const nameEl = row.querySelector<HTMLElement>(".leaf-name");
-  if (!nameEl) return;
-  const input = document.createElement("input");
-  input.type = "text";
-  input.className = "leaf-name leaf-rename";
-  input.value = customSessionName(s) ?? "";
-  input.maxLength = MAX_SESSION_NAME_LEN;
-  input.setAttribute("aria-label", `Rename ${sessionName(s)}`);
-  // The card is an <a>, and the tree starts a drag on pointerdown: without
-  // these, clicking into the field navigates away or begins dragging the row.
-  for (const type of ["click", "pointerdown", "dblclick"]) {
-    input.addEventListener(type, (ev) => {
-      ev.preventDefault();
-      ev.stopPropagation();
-      input.focus();
-    });
-  }
-
-  renamingId = s.id;
-  let settled = false;
-  const finish = () => {
-    if (settled) return false;
-    settled = true;
-    renamingId = null;
-    document.dispatchEvent(new CustomEvent("catalog-rerender"));
-    return true;
-  };
-
-  input.addEventListener("keydown", (ev) => {
-    if (ev.key === "Enter") {
-      ev.preventDefault();
-      // Normalised here so what is sent is what the daemon will store.
-      const name = normalizeSessionName(input.value);
-      if (!finish()) return;
-      void renameSession(s.id, name).catch((e: Error) => {
-        alert(`Failed to rename: ${e.message}`);
-      });
-    } else if (ev.key === "Escape") {
-      ev.preventDefault();
-      finish();
-    }
-  });
-  input.addEventListener("blur", () => finish());
-
-  nameEl.replaceWith(input);
-  input.focus();
-  input.select();
-}
-
-// The tree has one empty state: no sessions at all. The old "No matches" one
-// belonged to the inline substring filter, which the command bar replaced
-// (#157) — the bar's own no-results state took over with it.
-function renderEmpty(onSpawn: () => void): HTMLElement {
-  const el = document.createElement("div");
-  el.className = "empty";
-  el.innerHTML = `
-    <div class="empty-glyph" aria-hidden="true">+</div>
-    <div class="empty-title">No sessions yet</div>
-    <p class="empty-hint">Start your first session — it'll show up here.</p>
-    <div class="empty-actions"></div>`;
-  const spawn = document.createElement("button");
-  spawn.type = "button";
-  spawn.className = "btn btn-primary";
-  spawn.textContent = "+ Spawn session";
-  spawn.addEventListener("click", onSpawn);
-  (el.querySelector(".empty-actions") as HTMLElement).appendChild(spawn);
-  return el;
-}
-
-/** Two-tier sidebar highlight state (issue #33): which sessions are open in some
- *  pane (quiet), and which one is focused (loud). */
-export interface SidebarHighlights {
-  open: Set<string>;
-  focused: string | null;
-}
-
-/** Live handle to the persistent sidebar (built once, survives navigation). */
-export interface SidebarHandle {
-  /** The `<aside>` element to mount into the shell. */
-  el: HTMLElement;
-  /** Highlight the row for `id` (or clear it with `null`) as the focused session.
-   *  Back-compat shim over {@link setHighlights}. */
-  setActive(id: string | null): void;
-  /** Apply the full open/focused highlight state. */
-  setHighlights(h: SidebarHighlights): void;
-  /** Mark the row the content pane is previewing (docs/PREVIEW.md), or clear it
-   *  with `null`. A preview is a view, not state, so this only paints. */
-  setPreview(sessionId: string | null): void;
-  /** Hand the keyboard to the session list, highlighting a row to walk from. */
-  focusList(): void;
-  /** Whether the session list currently holds DOM focus. */
-  hasListFocus(): boolean;
-  /** Tear down the store subscription + listeners. */
-  dispose(): void;
-}
-
-/**
- * Build the persistent session sidebar: brand, search, spawn, theme toggle, a
- * live session status line, and the folder-grouped session tree. Unlike
- * the old full-screen catalog this is mounted once by the shell and stays put
- * while the content pane swaps between sessions — so the store subscription and
- * scroll position survive navigation. The active session is highlighted.
- */
-export interface SidebarOptions {
-  /** Pointerdown on a session row — the multi-view controller decides drag vs
-   *  tap (issue #32). Tap falls through to the row's normal click (open). */
-  onLeafDrag?: (sessionId: string, e: PointerEvent) => void;
-  /** Daemon link behind the footer's status dot. Omitted in tests and in the
-   *  design kit, which render the sidebar without a daemon. */
-  link?: DaemonLink;
-  /** The highlight moved onto a session, or off every session (`null`): the
-   *  shell shows it in the content pane without opening it (docs/PREVIEW.md).
-   *  `source` is there so a mouse sweep can be debounced differently from a
-   *  keyboard step. */
-  onPreview?: (sessionId: string | null) => void;
-}
-
-export function renderSidebar(store: CatalogStore, opts: SidebarOptions = {}): SidebarHandle {
-  const el = document.createElement("aside");
-  el.className = "sidebar";
-
-  // The daemon's home dir abbreviates cwds to `~/…`. Fetched once; the tree
-  // renders with absolute paths until it lands.
-  let homeDir: string | undefined;
-
-  // The field never holds a query: it is the touch entry point to the command
-  // bar (#157), so it is `readonly` — a tap opens the bar instead of raising an
-  // on-screen keyboard over a field nothing is typed into.
-  const searchHeader = document.createElement("header");
-  searchHeader.className = "sidebar-search";
-  searchHeader.innerHTML = `
-    <input
-      type="search"
-      class="search"
-      readonly
-      placeholder="Search sessions…"
-      aria-label="Search sessions"
-      autocomplete="off"
-      autocorrect="off"
-      autocapitalize="off"
-      spellcheck="false"
-    />
-  `;
-  el.appendChild(searchHeader);
-
-  const treeHost = document.createElement("div");
-  treeHost.className = "tree";
-  el.appendChild(treeHost);
-
-  // App-level actions (help, theme, spawn) live pinned to the sidebar's foot
-  // rather than the sidebar's own scrolling content, so they stay reachable
-  // regardless of tree scroll position.
-  const footer = document.createElement("div");
-  footer.className = "sidebar-footer";
-  const helpBtn = document.createElement("button");
-  helpBtn.type = "button";
-  helpBtn.className = "btn btn-ghost btn-icon help-btn";
-  helpBtn.textContent = "?";
-  helpBtn.title = "Keyboard shortcuts (?)";
-  helpBtn.setAttribute("aria-label", "Keyboard shortcuts");
-  helpBtn.addEventListener("click", () => toggleHelp());
-  footer.appendChild(helpBtn);
-  footer.appendChild(createThemeToggle());
-  footer.appendChild(createPaletteSelect());
-  // DEV-only shortcut to the standalone design kit (?kit). Lets you reach it by
-  // clicking inside a proxied preview (e.g. crit live) that has no address bar.
-  if (import.meta.env.DEV) {
-    const kit = document.createElement("a");
-    kit.className = "btn btn-ghost";
-    kit.href = "?kit";
-    kit.textContent = "kit";
-    kit.title = "Open the design kit (DEV)";
-    footer.appendChild(kit);
-  }
-  // Daemon status sits beside the spawn button: colour for the link state,
-  // hover for the release the daemon is running.
-  const status = opts.link ? createStatusIndicator(opts.link) : null;
-  if (status) footer.appendChild(status.el);
-  const spawnBtn = document.createElement("button");
-  spawnBtn.type = "button";
-  spawnBtn.className = "btn btn-primary spawn-btn";
-  spawnBtn.textContent = "+ Spawn";
-  // The keyboard pair sits right here in the tooltip (#67).
-  spawnBtn.title = "Spawn form: n — fast-forward spawn: N";
-  spawnBtn.addEventListener("click", () => requestOpenSpawn());
-  footer.appendChild(spawnBtn);
-  el.appendChild(footer);
-
-  // Drag a session row into the canvas (issue #32). Delegated so it survives
-  // tree re-renders; the controller handles drag-vs-tap (tap still navigates).
-  treeHost.addEventListener("pointerdown", (e) => {
-    if (e.button !== 0 || !opts.onLeafDrag) return;
-    const leaf = (e.target as HTMLElement).closest<HTMLElement>(".tree-leaf");
-    const id = leaf?.dataset.sessionId;
-    if (id) opts.onLeafDrag(id, e);
-  });
-  // The rows are <a> elements, so the browser's native link drag-and-drop would
-  // otherwise hijack pointermove and our live drop-zone preview wouldn't show
-  // until release. Suppress it so the pointer-based drag runs from the start.
-  treeHost.addEventListener("dragstart", (e) => {
-    if ((e.target as HTMLElement).closest(".tree-leaf")) e.preventDefault();
-  });
-
-  // Drag-to-resize handle on the sidebar's right edge. Persists the chosen
-  // width as a :root CSS var the shell grid reads; clamped to a sane range.
-  const SIDEBAR_W_KEY = "maestro-sidebar-w";
-  const storedW = localStorage.getItem(SIDEBAR_W_KEY);
-  if (storedW) document.documentElement.style.setProperty("--sidebar-w", storedW);
-  const handle = document.createElement("div");
-  handle.className = "sidebar-resize";
-  handle.setAttribute("aria-hidden", "true");
-  el.appendChild(handle);
-  let dragStartX = 0;
-  let dragStartW = 0;
-  let dragging = false;
-  handle.addEventListener("pointerdown", (e) => {
-    dragging = true;
-    dragStartX = e.clientX;
-    dragStartW = el.getBoundingClientRect().width;
-    handle.setPointerCapture(e.pointerId);
-    document.body.style.userSelect = "none";
-    e.preventDefault();
-  });
-  handle.addEventListener("pointermove", (e) => {
-    if (!dragging) return;
-    const w = Math.max(200, Math.min(560, dragStartW + (e.clientX - dragStartX)));
-    document.documentElement.style.setProperty("--sidebar-w", `${w}px`);
-  });
-  const endDrag = (e: PointerEvent) => {
-    if (!dragging) return;
-    dragging = false;
-    try {
-      handle.releasePointerCapture(e.pointerId);
-    } catch {
-      // pointer may already be released
-    }
-    document.body.style.userSelect = "";
-    const cur = document.documentElement.style.getPropertyValue("--sidebar-w");
-    if (cur) localStorage.setItem(SIDEBAR_W_KEY, cur);
-  };
-  handle.addEventListener("pointerup", endDrag);
-  handle.addEventListener("pointercancel", endDrag);
-
-  // Touch entry (#157): the field is a button that looks like a field. It
-  // never holds a query — focusing or tapping it hands the keyboard straight
-  // to the bar's own input, which is also why it blurs first: leaving the
-  // focus here would make the bar impossible to close without reopening it.
-  const search = searchHeader.querySelector(".search") as HTMLInputElement;
-  const openBar = () => {
-    search.value = "";
-    search.blur();
-    requestOpenCommandBar();
-  };
-  search.addEventListener("focus", openBar);
-  // A tap can land without a focus event (iOS Safari on a blurred field), so
-  // the pointer path opens the bar too; the blur above keeps the two from
-  // stacking two overlays.
-  search.addEventListener("pointerdown", (e) => {
-    e.preventDefault();
-    openBar();
-  });
-
-  let highlights: SidebarHighlights = { open: new Set(), focused: null };
-  // The previewed row is painted alongside the open/focused tiers so a
-  // re-render can't drop it, but it is never part of `highlights`: a preview
-  // is a view, and nothing about it is durable (docs/PREVIEW.md).
-  let previewing: string | null = null;
-  const applyHighlights = () => {
-    for (const n of treeHost.querySelectorAll<HTMLElement>(".tree-leaf")) {
-      const id = n.dataset.sessionId;
-      if (!id) continue;
-      const focused = highlights.focused === id;
-      const open = highlights.open.has(id);
-      n.classList.toggle("is-active", focused);
-      n.classList.toggle("is-open", open && !focused);
-      n.classList.toggle("is-previewing", previewing === id);
-    }
-  };
-
-  // ---- keyboard navigation ----
-  // The walk reads the rendered DOM rather than a parallel model, so it can
-  // never disagree with what is on screen. Rows carry a `data-nav-key`
-  // (`session:<id>` / `folder:<path>`) that survives a re-render.
-  let navKey: string | null = null;
-
-  const navRows = (): HTMLElement[] => [
-    ...treeHost.querySelectorAll<HTMLElement>(NAV_SELECTOR),
-  ];
-
-  const rowFor = (key: string | null): HTMLElement | undefined =>
-    key === null ? undefined : navRows().find((r) => r.dataset.navKey === key);
-
-  const applyNav = () => {
-    const rows = navRows();
-    // A row that went away (session killed, folder collapsed) drops the
-    // highlight rather than leaving it pointing at nothing.
-    if (navKey !== null && !rows.some((r) => r.dataset.navKey === navKey)) navKey = null;
-    for (const r of rows) r.classList.toggle("is-highlighted", r.dataset.navKey === navKey);
-  };
-
-  const sessionOf = (key: string | null): string | null =>
-    key?.startsWith("session:") ? key.slice("session:".length) : null;
-
-  const moveNav = (delta: number) => {
-    const rows = navRows();
-    if (rows.length === 0) return;
-    const cur = rows.findIndex((r) => r.dataset.navKey === navKey);
-    // Nothing highlighted: start one off the end we are walking from, so the
-    // first step lands on the first (or last) row.
-    const from = cur === -1 ? (delta > 0 ? -1 : 0) : cur;
-    const next = rows[(((from + delta) % rows.length) + rows.length) % rows.length];
-    navKey = next.dataset.navKey ?? null;
-    applyNav();
-    next.scrollIntoView({ block: "nearest" });
-    opts.onPreview?.(sessionOf(navKey));
-  };
-
-  /** Enter: open the highlighted session, or expand the highlighted folder. */
-  const activateNav = () => {
-    const row = rowFor(navKey);
-    if (!row) return;
-    if (row.classList.contains("tree-leaf")) {
-      row.click();
-      return;
-    }
-    // Expanding replaces the folder's header in the walk with the rows it was
-    // hiding, so land on the first of them instead of losing the highlight.
-    const key = navKey;
-    row.click();
-    const header = [...treeHost.querySelectorAll<HTMLElement>(".tree-folder-header")].find(
-      (h) => h.dataset.navKey === key,
-    );
-    const revealed = header?.parentElement
-      ? [...header.parentElement.querySelectorAll<HTMLElement>(NAV_SELECTOR)][0]
-      : undefined;
-    navKey = revealed?.dataset.navKey ?? null;
-    applyNav();
-  };
-
-  // Pointer hover previews only while Ctrl is held — plain hover was too
-  // disruptive when sweeping the sidebar. Keyboard walk (j/k) still previews
-  // unconditionally via applyNav.
-  let hovered: string | null = null;
-  const setHovered = (id: string | null) => {
-    if (hovered === id) return;
-    hovered = id;
-    opts.onPreview?.(id);
-  };
-  treeHost.addEventListener("pointerover", (e) => {
-    if (e.pointerType === "touch" || !e.ctrlKey) return;
-    const row = (e.target as HTMLElement | null)?.closest<HTMLElement>(".tree-leaf");
-    setHovered(row?.dataset.sessionId ?? null);
-  });
-  treeHost.addEventListener("pointerleave", (e) => {
-    if (e.pointerType === "touch") return;
-    setHovered(null);
-  });
-
-  // Focusable as a unit: the walk moves a highlight, not DOM focus, so the
-  // keyboard stays here while j/k runs.
-  treeHost.tabIndex = -1;
-  // The keyboard walk's preview belongs to the list having the keyboard: once
-  // it doesn't, the content pane goes back to what the operator actually opened.
-  treeHost.addEventListener("blur", () => opts.onPreview?.(null));
-
-  /** The session behind the highlighted row, if the highlight is on a card. */
-  const highlightedSession = (): { row: HTMLElement; session: Session } | undefined => {
-    const row = rowFor(navKey);
-    const id = row?.dataset.sessionId;
-    if (!row || !id) return undefined;
-    const session = store.snapshot().sessions.get(id);
-    return session ? { row, session } : undefined;
-  };
-
-  /** `c`: collapse or expand the highlighted folder, the TUI's
-   *  `ToggleSidebarGroup`. Clicking the header is what toggles it; on a card
-   *  the key does nothing rather than toggling some other folder. */
-  const toggleHighlightedFolder = () => {
-    const row = rowFor(navKey);
-    if (!row || !row.classList.contains("tree-folder-header")) return;
-    row.click();
-    applyNav();
-  };
-
-  // The session list's half of the command registry (#148). One set per
-  // sidebar, so a second sidebar (tests, hot reload) drives its own rows; the
-  // labels and chords still come from the one registry.
-  const listKeys = new CommandSet(
-    defineCommands({
-      "list.next": () => moveNav(1),
-      "list.prev": () => moveNav(-1),
-      "list.activate": () => activateNav(),
-      "list.toggleFolder": () => toggleHighlightedFolder(),
-      "list.rename": () => {
-        const hit = highlightedSession();
-        if (hit) beginRename(hit.row, hit.session);
-      },
-      "list.kill": () => {
-        const hit = highlightedSession();
-        if (hit) requestKill(hit.session, sessionName(hit.session));
-      },
-      "list.focusPane": () => document.dispatchEvent(new CustomEvent(FOCUS_PANE_EVENT)),
-    }),
-  );
-
-  // The inline rename field lives inside a row and owns its own keys; the set's
-  // plain-key rule keeps this walk out of it.
-  treeHost.addEventListener("keydown", (e) => listKeys.handle(e));
-
-  /** Signature of what is currently on screen — see `treeSignature`. */
-  let renderedSignature: string | null = null;
-
-  const refresh = () => {
-    // Rebuilding the tree now would blow away the field being typed into.
-    if (renamingId !== null) return;
-    const state = store.snapshot();
-    const sessions = [...state.sessions.values()];
-    const tree = buildTree(sessions, homeDir);
-    const signature = sessions.length === 0 ? "EMPTY" : treeSignature(tree);
-    if (signature === renderedSignature) {
-      for (const row of treeHost.querySelectorAll<HTMLElement>(".tree-leaf")) {
-        const s = row.dataset.sessionId ? state.sessions.get(row.dataset.sessionId) : undefined;
-        if (s) leafPatches.get(row)?.(s);
-      }
-      return;
-    }
-    renderedSignature = signature;
-    treeHost.replaceChildren();
-    if (sessions.length === 0) {
-      treeHost.appendChild(renderEmpty(() => requestOpenSpawn()));
-      return;
-    }
-    if (tree.kind === "folder") {
-      for (const child of tree.children) treeHost.appendChild(renderNode(child, 0));
-    }
-    applyHighlights();
-    applyNav();
-  };
-
-  void getDaemonInfo()
-    .then((info) => {
-      homeDir = info.home_dir;
-      refresh();
-    })
-    .catch(() => {
-      /* absolute paths are a fine fallback */
-    });
-
-  // Dispatched when something outside the store changed what the tree should
-  // look like — a folder collapsed, a rename ended — none of which the store
-  // snapshot can show, so the signature check has to be bypassed.
-  const rerenderHandler = () => {
-    renderedSignature = null;
-    refresh();
-  };
-  document.addEventListener("catalog-rerender", rerenderHandler);
-
-  // The command bar's action page (#151) picks an action and hands it here:
-  // both flows are the ones the card already has, reached by session rather
-  // than by row.
-  const killHandler = (ev: Event) => {
-    const s = (ev as CustomEvent<Session>).detail;
-    requestKill(s, sessionName(s));
-  };
-  const renameHandler = (ev: Event) => {
-    const s = (ev as CustomEvent<Session>).detail;
-    const row = rowForSession(s);
-    if (row) beginRename(row, s);
-  };
-  document.addEventListener(KILL_SESSION_EVENT, killHandler);
-  document.addEventListener(RENAME_SESSION_EVENT, renameHandler);
-
-  /** The card a session is rendered as, expanding whatever folder hides it
-   *  first: the rename prompt lives inside the card, so a collapsed folder
-   *  would otherwise swallow the request. */
-  function rowForSession(s: Session): HTMLElement | null {
-    const find = () => treeHost.querySelector<HTMLElement>(`.tree-leaf[data-session-id="${s.id}"]`);
-    const found = find();
-    if (found) return found;
-    // Folder paths are the abbreviated directory's segments joined back up
-    // (see buildTree), so the session's own path is normalised the same way
-    // before it is compared against them.
-    const cwd = sessionTreePath(s);
-    const path = (cwd ? abbreviateCwd(cwd, homeDir) : "").split("/").filter(Boolean).join("/");
-    for (const folder of [...collapsed]) {
-      if (path === folder || path.startsWith(`${folder}/`)) collapsed.delete(folder);
-    }
-    rerenderHandler();
-    return find();
-  }
-
-  // "Spawn similar" (#28) is dispatched here and handled in main.ts, where the
-  // multi-view controller can seed the spawn modal with the session's dir/command.
-
-  const unsubscribe = store.subscribe(refresh);
-
-  // Contract granularity: re-render at least every 30s while visible so the
-  // duration cutover points land within one tick.
-  const clock = setInterval(() => {
-    if (document.visibilityState !== "visible") return;
-    refresh();
-  }, 30_000);
-
-  return {
-    el,
-    setActive(id: string | null) {
-      highlights = {
-        open: id ? new Set([id]) : new Set(),
-        focused: id,
-      };
-      applyHighlights();
-    },
-    setHighlights(h: SidebarHighlights) {
-      highlights = h;
-      applyHighlights();
-    },
-    setPreview(sessionId: string | null) {
-      previewing = sessionId;
-      applyHighlights();
-    },
-    focusList() {
-      // Start from the session on screen — that is where the user's attention
-      // already is — falling back to the standing highlight, then the top row.
-      const preferred = highlights.focused ? `session:${highlights.focused}` : null;
-      const start = rowFor(preferred) ?? rowFor(navKey) ?? navRows()[0];
-      navKey = start?.dataset.navKey ?? null;
-      applyNav();
-      treeHost.focus();
-      start?.scrollIntoView({ block: "nearest" });
-    },
-    hasListFocus() {
-      return treeHost.contains(document.activeElement);
-    },
-    dispose() {
-      clearInterval(clock);
-      status?.dispose();
-      // An unfinished rename would otherwise leave every later sidebar
-      // refusing to refresh.
-      renamingId = null;
-      document.removeEventListener("catalog-rerender", rerenderHandler);
-      document.removeEventListener(KILL_SESSION_EVENT, killHandler);
-      document.removeEventListener(RENAME_SESSION_EVENT, renameHandler);
-      unsubscribe();
-    },
-  };
-}

web/src/catalogPatch.test.ts

@@ -1,105 +0,0 @@
-// @vitest-environment happy-dom
-import { beforeAll, describe, expect, it } from "vitest";
-
-import { renderSidebar } from "./catalog.js";
-import type { CatalogListener, CatalogStore } from "./events.js";
-import type { Session } from "./types.js";
-
-beforeAll(() => {
-  Object.defineProperty(window, "localStorage", {
-    value: { getItem: () => null, setItem: () => {} },
-  });
-  window.fetch = () => Promise.reject(new Error("offline"));
-});
-
-const ID = "11111111-2222-3333-4444-555555555555";
-
-function session(overrides: Partial<Session> = {}): Session {
-  return {
-    id: ID,
-    cwd: "/home/naps/tea/maestro",
-    command: "claude",
-    env: {},
-    metadata: {},
-    status: "Running",
-    created_at: "2026-08-24T10:00:00Z",
-    ...overrides,
-  };
-}
-
-/** A store whose updates actually reach subscribers, unlike the one-shot
- *  harness in catalog.test.ts. */
-function liveStore(initial: Session[]) {
-  const state = { sessions: new Map(initial.map((s) => [s.id, s])) };
-  const listeners = new Set<CatalogListener>();
-  const store = {
-    snapshot: () => state,
-    subscribe: (fn: CatalogListener) => {
-      listeners.add(fn);
-      fn(state);
-      return () => listeners.delete(fn);
-    },
-  } as unknown as CatalogStore;
-  const push = (sessions: Session[]) => {
-    state.sessions = new Map(sessions.map((s) => [s.id, s]));
-    for (const fn of listeners) fn(state);
-  };
-  return { store, push };
-}
-
-const rowOf = (el: HTMLElement) => el.querySelector<HTMLElement>(".tree-leaf")!;
-
-describe("sidebar refresh keeps rows in place (docs/SIDEBAR.md)", () => {
-  it("patches an activity change into the standing row instead of rebuilding it", () => {
-    const { store, push } = liveStore([session({ activity: "Idle" })]);
-    const { el } = renderSidebar(store, {});
-    const before = rowOf(el);
-
-    push([session({ activity: "AwaitingInput" })]);
-
-    // Same element: a rebuild under the pointer would drop `:hover` and restart
-    // the row's transitions, which is the flicker this avoids.
-    expect(rowOf(el)).toBe(before);
-    // …and the card still tells the truth about the session.
-    expect(before.querySelector(".activity-rail")?.getAttribute("data-activity")).toBe(
-      "awaiting-input",
-    );
-    expect(before.querySelector(".card-line2")?.getAttribute("data-activity")).toBe(
-      "awaiting-input",
-    );
-    expect(before.getAttribute("aria-label")).toContain("Awaiting input");
-  });
-
-  it("rebuilds when the row set changes", () => {
-    const { store, push } = liveStore([session()]);
-    const { el } = renderSidebar(store, {});
-    const before = rowOf(el);
-
-    push([session(), session({ id: "99999999-2222-3333-4444-555555555555", command: "bash" })]);
-
-    expect(el.querySelectorAll(".tree-leaf")).toHaveLength(2);
-    expect(rowOf(el)).not.toBe(before);
-  });
-
-  it("rebuilds when a session dies", () => {
-    const { store, push } = liveStore([session()]);
-    const { el } = renderSidebar(store, {});
-    const before = rowOf(el);
-
-    push([session({ status: "Dead" })]);
-
-    expect(rowOf(el)).not.toBe(before);
-    expect(rowOf(el).dataset.status).toBe("dead");
-  });
-
-  it("rebuilds when a session is renamed", () => {
-    const { store, push } = liveStore([session()]);
-    const { el } = renderSidebar(store, {});
-    const before = rowOf(el);
-
-    push([session({ metadata: { name: "harmony" } })]);
-
-    expect(rowOf(el)).not.toBe(before);
-    expect(rowOf(el).querySelector(".leaf-name")?.textContent).toBe("harmony");
-  });
-});

web/src/commandBar.test.ts

@@ -1,723 +0,0 @@
-// @vitest-environment happy-dom
-import { afterEach, describe, expect, it, vi } from "vitest";
-
-import {
-  KILL_SESSION_EVENT,
-  RENAME_SESSION_EVENT,
-  SESSION_SELECT_EVENT,
-  SPAWN_SIMILAR_EVENT,
-} from "./catalog.js";
-import {
-  barGroups,
-  barRows,
-  closeCommandBar,
-  commandBarCandidates,
-  dedupeCommands,
-  directoryBarCandidates,
-  directoryCandidate,
-  isCommandBarOpen,
-  openCommandBar,
-  orderSessionsForBar,
-  parseBarQuery,
-  sessionBarCandidates,
-  sessionActionCandidates,
-  sessionCandidate,
-  SPAWN_DIRECTORY_EVENT,
-} from "./commandBar.js";
-import { COMMAND_SPECS, type Command } from "./commands.js";
-import type { Session } from "./types.js";
-
-function session(id: string, over: Partial<Session> = {}): Session {
-  return {
-    id,
-    cwd: "/home/me/dev/api",
-    command: "bash",
-    env: {},
-    metadata: { name: id },
-    status: "Running",
-    created_at: "2026-01-01T00:00:00Z",
-    ...over,
-  };
-}
-
-afterEach(() => {
-  closeCommandBar();
-  document.body.replaceChildren();
-});
-
-function press(key: string, init: KeyboardEventInit = {}): void {
-  const input = document.querySelector(".cmdbar-input") as HTMLInputElement;
-  input.dispatchEvent(new KeyboardEvent("keydown", { key, bubbles: true, ...init }));
-}
-
-function type(value: string): void {
-  const input = document.querySelector(".cmdbar-input") as HTMLInputElement;
-  input.value = value;
-  input.dispatchEvent(new Event("input", { bubbles: true }));
-}
-
-function rowNames(): string[] {
-  return [...document.querySelectorAll(".cmdbar-row-name")].map((r) => r.textContent ?? "");
-}
-
-function activeName(): string | undefined {
-  return document.querySelector(".cmdbar-row.is-active .cmdbar-row-name")?.textContent ?? undefined;
-}
-
-describe("empty-query ordering", () => {
-  it("sorts most recently focused first", () => {
-    const older = session("older", { last_focused_at: "2026-01-01T10:00:00Z" });
-    const newer = session("newer", { last_focused_at: "2026-01-01T11:00:00Z" });
-    expect(orderSessionsForBar([older, newer]).map((s) => s.id)).toEqual(["newer", "older"]);
-  });
-
-  it("sorts a never-focused session after every focused one, newest created first", () => {
-    const focused = session("focused", {
-      last_focused_at: "2020-01-01T00:00:00Z",
-      created_at: "2020-01-01T00:00:00Z",
-    });
-    const oldFresh = session("old-fresh", { created_at: "2026-01-01T00:00:00Z" });
-    const newFresh = session("new-fresh", { created_at: "2026-06-01T00:00:00Z" });
-    expect(orderSessionsForBar([oldFresh, newFresh, focused]).map((s) => s.id)).toEqual([
-      "focused",
-      "new-fresh",
-      "old-fresh",
-    ]);
-  });
-
-  it("sorts dead sessions after live ones regardless of recency", () => {
-    const deadRecent = session("dead", {
-      status: "Dead",
-      last_focused_at: "2026-06-01T00:00:00Z",
-    });
-    const liveStale = session("live", { last_focused_at: "2020-01-01T00:00:00Z" });
-    const liveNever = session("never");
-    expect(orderSessionsForBar([deadRecent, liveNever, liveStale]).map((s) => s.id)).toEqual([
-      "live",
-      "never",
-      "dead",
-    ]);
-  });
-
-  it("treats a null last_focused_at as never focused", () => {
-    const nulled = session("nulled", { last_focused_at: null });
-    const stamped = session("stamped", { last_focused_at: "2020-01-01T00:00:00Z" });
-    expect(orderSessionsForBar([nulled, stamped]).map((s) => s.id)).toEqual(["stamped", "nulled"]);
-  });
-});
-
-describe("session candidates", () => {
-  it("carries the candidate table's fields, with the directory abbreviated", () => {
-    const s = session("api", {
-      metadata: { name: "api" },
-      command: "claude --resume",
-      current_cwd: "/home/me/dev/api",
-    });
-    expect(sessionCandidate(s, "/home/me")).toEqual({
-      kind: "session",
-      session: s,
-      fields: {
-        name: "api",
-        directory: "~/dev/api",
-        command: "claude --resume",
-        tool: "claude",
-      },
-    });
-  });
-
-  it("leaves the tool out when the program has no mark, and groups a worktree by its repo", () => {
-    const s = session("edit", {
-      metadata: {},
-      command: "hx src/",
-      worktree: { path: "/home/me/dev/api/wt/x", base_repo: "/home/me/dev/api" },
-    });
-    const candidate = sessionCandidate(s, "/home/me");
-    expect(candidate.fields.tool).toBeUndefined();
-    expect(candidate.fields.directory).toBe("~/dev/api");
-    // No `metadata.name`: the sidebar's fallback is the command line.
-    expect(candidate.fields.name).toBe("hx src/");
-  });
-
-  it("builds candidates in the empty-query order", () => {
-    const a = session("a", { last_focused_at: "2026-01-01T10:00:00Z" });
-    const b = session("b", { last_focused_at: "2026-01-01T11:00:00Z" });
-    expect(sessionBarCandidates([a, b]).map((c) => c.session.id)).toEqual(["b", "a"]);
-  });
-});
-
-describe("rows and grouping", () => {
-  it("an empty query keeps every session in input order", () => {
-    const candidates = sessionBarCandidates([session("a"), session("b")]);
-    expect(barRows("", candidates).map((r) => r.candidate.session.id)).toEqual(["a", "b"]);
-  });
-
-  it("groups by kind without reordering the ranking", () => {
-    const candidates = sessionBarCandidates([
-      session("worker", { metadata: { name: "worker" }, current_cwd: "/home/me/dev/api" }),
-      session("api", { metadata: { name: "api" }, current_cwd: "/home/me/dev/web" }),
-    ]);
-    const rows = barRows("api", candidates);
-    const groups = barGroups(rows);
-    expect(groups).toHaveLength(1);
-    expect(groups[0].title).toBe("Sessions");
-    expect(groups[0].results.map((r) => r.candidate.session.id)).toEqual(
-      rows.map((r) => r.candidate.session.id),
-    );
-    // F6: the name beats the directory, and the directory match highlights
-    // inside the directory.
-    expect(groups[0].results[0].candidate.session.id).toBe("api");
-    expect(groups[0].results[1].field).toBe("directory");
-  });
-});
-
-describe("the overlay", () => {
-  const sessions = [
-    session("api", {
-      metadata: { name: "api" },
-      current_cwd: "/home/me/dev/api",
-      last_focused_at: "2026-01-01T11:00:00Z",
-    }),
-    session("worker", {
-      metadata: { name: "worker" },
-      current_cwd: "/home/me/dev/worker",
-      last_focused_at: "2026-01-01T10:00:00Z",
-    }),
-    session("notes", { metadata: { name: "notes" }, current_cwd: "/home/me/notes" }),
-  ];
-
-  // Sessions only: the mixed list's command half is the sigil describe's
-  // business, and the registry is whatever another test file happened to bind.
-  function open(over: Parameters<typeof openCommandBar>[0] | null = null) {
-    return openCommandBar(
-      over ?? { sessions, homeDir: "/home/me", commands: [], onOpenSession: () => {} },
-    );
-  }
-
-  it("is a registry command, so the help overlay lists it", () => {
-    const spec = COMMAND_SPECS.find((s) => s.id === "bar.open");
-    expect(spec?.keys).toEqual(["ctrl-k"]);
-    expect(spec?.scope).toBe("global");
-  });
-
-  it("lists sessions by recency under a kind header on an empty query", () => {
-    open();
-    expect([...document.querySelectorAll(".cmdbar-group-title")].map((h) => h.textContent)).toEqual([
-      "Sessions",
-    ]);
-    expect(rowNames()).toEqual(["api", "worker", "notes"]);
-    expect(activeName()).toBe("api");
-  });
-
-  it("opening twice leaves one overlay", () => {
-    open();
-    open();
-    expect(document.querySelectorAll(".cmdbar-overlay")).toHaveLength(1);
-    expect(isCommandBarOpen()).toBe(true);
-  });
-
-  it("ranks a typed query through the matcher and highlights the matched range", () => {
-    open();
-    type("wor");
-    expect(rowNames()).toEqual(["worker"]);
-    const marks = [...document.querySelectorAll(".cmdbar-row-name mark")].map((m) => m.textContent);
-    expect(marks).toEqual(["wor"]);
-  });
-
-  it("highlights inside the directory when that is the field that matched", () => {
-    open();
-    type("notes");
-    const row = document.querySelector(".cmdbar-row") as HTMLElement;
-    expect(row.dataset.sessionId).toBe("notes");
-    type("dev/wor");
-    expect(rowNames()).toEqual(["worker"]);
-    expect(
-      [...document.querySelectorAll(".cmdbar-row-meta mark")].map((m) => m.textContent).join(""),
-    ).toBe("dev/wor");
-  });
-
-  it("renders a no-results state rather than an empty list", () => {
-    open();
-    type("zzz");
-    expect(rowNames()).toEqual([]);
-    expect(document.querySelector(".cmdbar-empty")?.textContent).toBe("No matches");
-  });
-
-  it("moves the highlight with the arrows and ctrl-p/ctrl-n, without wrapping", () => {
-    open();
-    press("ArrowUp");
-    expect(activeName()).toBe("api");
-    press("ArrowDown");
-    expect(activeName()).toBe("worker");
-    press("n", { ctrlKey: true });
-    expect(activeName()).toBe("notes");
-    press("ArrowDown");
-    expect(activeName()).toBe("notes");
-    press("p", { ctrlKey: true });
-    expect(activeName()).toBe("worker");
-  });
-
-  it("puts the highlight back on the best row whenever the query changes", () => {
-    open();
-    press("ArrowDown");
-    expect(activeName()).toBe("worker");
-    type("o");
-    expect(activeName()).toBe(document.querySelector(".cmdbar-row-name")?.textContent);
-  });
-
-  it("opens the highlighted session through the shared open path on Enter", () => {
-    const seen: string[] = [];
-    const listener = (e: Event) => seen.push((e as CustomEvent<string>).detail);
-    document.addEventListener(SESSION_SELECT_EVENT, listener);
-    openCommandBar({ sessions, homeDir: "/home/me", commands: [] });
-    press("ArrowDown");
-    press("Enter");
-    document.removeEventListener(SESSION_SELECT_EVENT, listener);
-    expect(seen).toEqual(["worker"]);
-    expect(isCommandBarOpen()).toBe(false);
-  });
-
-  it("Enter on an empty result list does nothing", () => {
-    const onOpenSession = vi.fn();
-    open({ sessions, homeDir: "/home/me", commands: [], onOpenSession });
-    type("zzz");
-    press("Enter");
-    expect(onOpenSession).not.toHaveBeenCalled();
-    expect(isCommandBarOpen()).toBe(true);
-  });
-
-  it("closes on Escape and on a press outside the panel", () => {
-    open();
-    press("Escape");
-    expect(isCommandBarOpen()).toBe(false);
-
-    open();
-    (document.querySelector(".cmdbar-overlay") as HTMLElement).dispatchEvent(
-      new MouseEvent("mousedown", { bubbles: true }),
-    );
-    expect(isCommandBarOpen()).toBe(false);
-  });
-
-  it("stays open for a press inside the panel", () => {
-    open();
-    (document.querySelector(".cmdbar-panel") as HTMLElement).dispatchEvent(
-      new MouseEvent("mousedown", { bubbles: true }),
-    );
-    expect(isCommandBarOpen()).toBe(true);
-  });
-
-  it("returns the keyboard to whatever held it when it opened", () => {
-    const before = document.createElement("button");
-    document.body.appendChild(before);
-    before.focus();
-    open();
-    expect(document.activeElement).toBe(document.querySelector(".cmdbar-input"));
-    press("Escape");
-    expect(document.activeElement).toBe(before);
-  });
-
-  it("clicking a row opens that session", () => {
-    const onOpenSession = vi.fn();
-    open({ sessions, homeDir: "/home/me", commands: [], onOpenSession });
-    (document.querySelectorAll(".cmdbar-row")[1] as HTMLElement).click();
-    expect(onOpenSession).toHaveBeenCalledWith("worker");
-    expect(isCommandBarOpen()).toBe(false);
-  });
-});
-
-// ---- the sigils (#150) ----
-
-function command(id: string, label: string, keys: string[], run = () => {}): Command {
-  return { id, label, group: "Test", keys, scope: "global", run };
-}
-
-const flush = () => new Promise((resolve) => setTimeout(resolve, 0));
-
-function rowKeys(): string[][] {
-  return [...document.querySelectorAll(".cmdbar-row-keys")].map((el) =>
-    [...el.querySelectorAll("kbd")].map((k) => k.textContent ?? ""),
-  );
-}
-
-describe("parsing the query line", () => {
-  it("reads a sigil only in first position", () => {
-    expect(parseBarQuery(">kill")).toEqual({ sigil: ">", query: "kill" });
-    expect(parseBarQuery("~/dev")).toEqual({ sigil: "~", query: "/dev" });
-    expect(parseBarQuery("")).toEqual({ sigil: null, query: "" });
-    expect(parseBarQuery("api")).toEqual({ sigil: null, query: "api" });
-  });
-
-  it("leaves a sigil character elsewhere in the query literal", () => {
-    expect(parseBarQuery("api>x")).toEqual({ sigil: null, query: "api>x" });
-    // The case that matters: the second `~` of a directory query reaches the
-    // matcher.
-    expect(parseBarQuery("~~/dev")).toEqual({ sigil: "~", query: "~/dev" });
-  });
-
-  it("returns to the mixed list when the sigil is backspaced away", () => {
-    expect(parseBarQuery(">").sigil).toBe(">");
-    expect(parseBarQuery("").sigil).toBeNull();
-  });
-});
-
-describe("command candidates", () => {
-  it("dedupes by action, not by chord", () => {
-    const run = () => {};
-    const kill = command("a.kill", "Kill the session", ["x"], run);
-    const alias = command("b.kill", "Kill the session", ["ctrl-x"], run);
-    const other = command("c.rename", "Rename the session", ["r"]);
-    expect(dedupeCommands([kill, alias, other]).map((c) => c.id)).toEqual(["a.kill", "c.rename"]);
-  });
-
-  it("matches on the label only, and keeps the chord for display", () => {
-    const candidates = commandBarCandidates([command("a", "Open the spawn form", ["ctrl-k"])]);
-    expect(candidates[0].fields).toEqual({ label: "Open the spawn form" });
-    expect(candidates[0].command.keys).toEqual(["ctrl-k"]);
-  });
-});
-
-describe("directory candidates", () => {
-  it("abbreviates the path it shows and keeps the one it spawns in", () => {
-    const c = directoryCandidate("/home/me/dev/api", "/home/me");
-    expect(c).toEqual({ kind: "directory", path: "/home/me/dev/api", fields: { path: "~/dev/api" } });
-  });
-
-  it("expands a typed `~` and dedupes by the directory spawned in", () => {
-    const paths = ["~/dev/api", "/home/me/dev/api", "/tmp/scratch"];
-    expect(directoryBarCandidates(paths, "/home/me").map((c) => c.path)).toEqual([
-      "/home/me/dev/api",
-      "/tmp/scratch",
-    ]);
-  });
-});
-
-describe("the sigils in the overlay", () => {
-  const sessions = [session("api", { metadata: { name: "api" }, current_cwd: "/home/me/dev/api" })];
-  const ran: string[] = [];
-  const commands = [
-    command("spawn.open", "Open the spawn form", ["n"], () => ran.push("spawn.open")),
-    command("list.kill", "Kill the highlighted session", ["x"], () => ran.push("list.kill")),
-  ];
-
-  afterEach(() => {
-    ran.length = 0;
-  });
-
-  function open(over: Partial<Parameters<typeof openCommandBar>[0]> = {}) {
-    return openCommandBar({
-      sessions,
-      homeDir: "/home/me",
-      commands,
-      onOpenSession: () => {},
-      loadDirectories: async () => [],
-      listDirEntries: async () => [],
-      onSpawnDirectory: () => {},
-      ...over,
-    });
-  }
-
-  it("lists every command in registry order under `>`, with its chord and no header", () => {
-    open();
-    type(">");
-    expect(rowNames()).toEqual(["Open the spawn form", "Kill the highlighted session"]);
-    expect(rowKeys()).toEqual([["n"], ["x"]]);
-    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
-  });
-
-  it("matches a command on its label and never on its chord", () => {
-    open();
-    type(">kill");
-    expect(rowNames()).toEqual(["Kill the highlighted session"]);
-    // `n` and `x` are chords, not label text: querying one finds nothing that
-    // the label does not also justify.
-    type(">ctrlx");
-    expect(rowNames()).toEqual([]);
-  });
-
-  it("runs the highlighted command on Enter", () => {
-    open();
-    type(">kill");
-    press("Enter");
-    expect(ran).toEqual(["list.kill"]);
-    expect(isCommandBarOpen()).toBe(false);
-  });
-
-  it("keeps the list mixed with no sigil, and returns to it when the sigil goes", () => {
-    open();
-    type("s");
-    expect([...document.querySelectorAll(".cmdbar-group-title")].map((h) => h.textContent)).toEqual([
-      "Sessions",
-      "Commands",
-    ]);
-    type(">spawn");
-    expect(rowNames()).toEqual(["Open the spawn form"]);
-    // Backspacing the sigil away is ordinary editing.
-    type("spawn");
-    expect(rowNames()).toContain("Open the spawn form");
-    type("");
-    expect(rowNames()).toEqual(["api"]);
-  });
-
-  it("lists recent dirs then projects under `~`", async () => {
-    open({ loadDirectories: async () => ["/home/me/dev/api", "/srv/www"] });
-    type("~");
-    await flush();
-    expect(rowNames()).toEqual(["~/dev/api", "/srv/www"]);
-    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
-  });
-
-  it("fills the list in from /api/dirs as a path is typed", async () => {
-    const asked: string[] = [];
-    open({
-      loadDirectories: async () => ["/home/me/notes"],
-      listDirEntries: async (dir) => {
-        asked.push(dir);
-        return ["maestro", "api"];
-      },
-    });
-    // The second `~` is a literal query character and reaches the matcher.
-    type("~~/dev/mae");
-    await flush();
-    expect(asked).toEqual(["~/dev/"]);
-    expect(rowNames()).toEqual(["~/dev/maestro"]);
-  });
-
-  it("spawns in the highlighted directory on Enter", async () => {
-    const spawned: string[] = [];
-    open({
-      loadDirectories: async () => ["~/dev/api"],
-      onSpawnDirectory: (path) => spawned.push(path),
-    });
-    type("~api");
-    await flush();
-    press("Enter");
-    expect(spawned).toEqual(["/home/me/dev/api"]);
-    expect(isCommandBarOpen()).toBe(false);
-  });
-
-  it("raises the spawn event when the caller supplies no handler", async () => {
-    const seen: string[] = [];
-    const listener = (e: Event) => seen.push((e as CustomEvent<string>).detail);
-    document.addEventListener(SPAWN_DIRECTORY_EVENT, listener);
-    openCommandBar({
-      sessions,
-      homeDir: "/home/me",
-      commands,
-      onOpenSession: () => {},
-      loadDirectories: async () => ["/home/me/dev/api"],
-      listDirEntries: async () => [],
-    });
-    type("~");
-    await flush();
-    press("Enter");
-    document.removeEventListener(SPAWN_DIRECTORY_EVENT, listener);
-    expect(seen).toEqual(["/home/me/dev/api"]);
-  });
-});
-
-describe("the focus round-trip over a pane (#152)", () => {
-  function terminalTextarea(): HTMLTextAreaElement {
-    const ta = document.createElement("textarea");
-    ta.className = "xterm-helper-textarea";
-    document.body.appendChild(ta);
-    return ta;
-  }
-
-  it("hands the keyboard back to the terminal that had it", () => {
-    const ta = terminalTextarea();
-    ta.focus();
-    openCommandBar({ sessions: [], commands: [] });
-    expect(document.activeElement).toBe(document.querySelector(".cmdbar-input"));
-    press("Escape");
-    expect(document.activeElement).toBe(ta);
-  });
-
-  it("reports no focus change to the daemon, opening or closing", () => {
-    const fetchMock = vi.fn(() => Promise.resolve(new Response(null, { status: 204 })));
-    vi.stubGlobal("fetch", fetchMock);
-    try {
-      const ta = terminalTextarea();
-      ta.focus();
-      openCommandBar({ sessions: [], commands: [] });
-      press("Escape");
-      const focusCalls = fetchMock.mock.calls.filter(([url]: unknown[]) =>
-        String(url).includes("/focus"),
-      );
-      expect(focusCalls).toEqual([]);
-    } finally {
-      vi.unstubAllGlobals();
-    }
-  });
-});
-
-describe("the session action page (#151)", () => {
-  const sessions = [
-    session("api", {
-      metadata: { name: "api" },
-      current_cwd: "/home/me/dev/api",
-      last_focused_at: "2026-01-01T11:00:00Z",
-    }),
-    session("worker", {
-      metadata: { name: "worker" },
-      current_cwd: "/home/me/dev/worker",
-      last_focused_at: "2026-01-01T10:00:00Z",
-    }),
-  ];
-
-  function open(over: Partial<Parameters<typeof openCommandBar>[0]> = {}) {
-    return openCommandBar({
-      sessions,
-      homeDir: "/home/me",
-      commands: [],
-      onOpenSession: () => {},
-      ...over,
-    });
-  }
-
-  function headerText(): string | undefined {
-    return document.querySelector(".cmdbar-page-header")?.textContent ?? undefined;
-  }
-
-  it("lists kill, rename and spawn similar for the highlighted session", () => {
-    open();
-    press("Tab");
-    expect(rowNames()).toEqual(["Kill session", "Rename session", "Spawn similar"]);
-    expect(activeName()).toBe("Kill session");
-  });
-
-  it("names the session being acted on", () => {
-    open();
-    press("ArrowDown");
-    press("Tab");
-    expect(headerText()).toContain("worker");
-  });
-
-  it("drops the kind headers, since the page is one kind", () => {
-    open();
-    press("Tab");
-    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
-  });
-
-  it("stays fuzzy-searchable over the three actions", () => {
-    open();
-    press("Tab");
-    type("ren");
-    expect(rowNames()).toEqual(["Rename session"]);
-    type("spwn");
-    expect(rowNames()).toEqual(["Spawn similar"]);
-    type("zzz");
-    expect(document.querySelector(".cmdbar-empty")?.textContent).toBe("No matches");
-  });
-
-  it("does nothing on a command row", () => {
-    openCommandBar({
-      sessions,
-      homeDir: "/home/me",
-      commands: [{ ...COMMAND_SPECS[0], run: () => {} } as Command],
-      onOpenSession: () => {},
-    });
-    type(">");
-    const before = rowNames();
-    press("Tab");
-    expect(rowNames()).toEqual(before);
-    expect(headerText()).toBeUndefined();
-  });
-
-  it("does nothing on a directory row", async () => {
-    open({ loadDirectories: () => Promise.resolve(["/home/me/dev/api"]) });
-    type("~");
-    await Promise.resolve();
-    press("Tab");
-    expect(rowNames()).toEqual(["~/dev/api"]);
-    expect(headerText()).toBeUndefined();
-  });
-
-  it("returns to the result list on Escape, with the previous query intact", () => {
-    open();
-    type("wor");
-    press("Tab");
-    expect(headerText()).toContain("worker");
-    press("Escape");
-    expect(isCommandBarOpen()).toBe(true);
-    expect(headerText()).toBeUndefined();
-    expect((document.querySelector(".cmdbar-input") as HTMLInputElement).value).toBe("wor");
-    expect(rowNames()).toEqual(["worker"]);
-  });
-
-  it("returns to the result list on backspace at an empty query", () => {
-    open();
-    type("wor");
-    press("Tab");
-    type("");
-    press("Backspace");
-    expect(headerText()).toBeUndefined();
-    expect((document.querySelector(".cmdbar-input") as HTMLInputElement).value).toBe("wor");
-    expect(rowNames()).toEqual(["worker"]);
-  });
-
-  it("keeps backspace ordinary while the page's query has text", () => {
-    open();
-    press("Tab");
-    type("ren");
-    press("Backspace");
-    expect(headerText()).toContain("api");
-    expect(rowNames()).toEqual(["Rename session"]);
-  });
-
-  it("closes the bar when the page's Escape has already been used", () => {
-    open();
-    press("Tab");
-    press("Escape");
-    press("Escape");
-    expect(isCommandBarOpen()).toBe(false);
-  });
-
-  it("raises kill, rename and spawn similar with the session, closing the bar", () => {
-    const seen: string[] = [];
-    for (const [hook, key] of [
-      ["onKillSession", "Kill session"],
-      ["onRenameSession", "Rename session"],
-      ["onSpawnSimilar", "Spawn similar"],
-    ] as const) {
-      open({ [hook]: (s: Session) => seen.push(`${hook}:${s.id}`) });
-      type("wor");
-      press("Tab");
-      type(key);
-      press("Enter");
-      expect(isCommandBarOpen()).toBe(false);
-    }
-    expect(seen).toEqual([
-      "onKillSession:worker",
-      "onRenameSession:worker",
-      "onSpawnSimilar:worker",
-    ]);
-  });
-
-  it("hands each action to the flow it already has, by default", () => {
-    const seen: string[] = [];
-    const listeners: Array<[string, EventListener]> = [
-      [KILL_SESSION_EVENT, (e) => seen.push(`kill:${(e as CustomEvent<Session>).detail.id}`)],
-      [RENAME_SESSION_EVENT, (e) => seen.push(`rename:${(e as CustomEvent<Session>).detail.id}`)],
-      [SPAWN_SIMILAR_EVENT, (e) => seen.push(`similar:${(e as CustomEvent<Session>).detail.id}`)],
-    ];
-    for (const [name, fn] of listeners) document.addEventListener(name, fn);
-    try {
-      for (const action of ["Kill session", "Rename session", "Spawn similar"]) {
-        open();
-        press("Tab");
-        type(action);
-        press("Enter");
-      }
-    } finally {
-      for (const [name, fn] of listeners) document.removeEventListener(name, fn);
-    }
-    expect(seen).toEqual(["kill:api", "rename:api", "similar:api"]);
-  });
-
-  it("offers no action beyond the three", () => {
-    expect(sessionActionCandidates().map((c) => c.action.id)).toEqual([
-      "kill",
-      "rename",
-      "spawn-similar",
-    ]);
-  });
-});

web/src/commandBar.ts

@@ -1,809 +0,0 @@
-// The `ctrl-k` command bar (docs/COMMAND-BAR.md): a query line over a result
-// list, opened from the sidebar, closed with Escape.
-//
-// Three kinds live here: sessions and commands, ranked together by default,
-// and directories, which need the `~` sigil. `tab` on a session drills into
-// its action page (#151), which is the same overlay over three actions.
-
-import { listDir, projects as fetchProjects, recentDirs } from "./api.js";
-import {
-  KILL_SESSION_EVENT,
-  RENAME_SESSION_EVENT,
-  SESSION_SELECT_EVENT,
-  SPAWN_SIMILAR_EVENT,
-} from "./catalog.js";
-import { keyCaps, publishedCommands, type Command } from "./commands.js";
-import {
-  matchAndRank,
-  type CandidateKind,
-  type CommandCandidate,
-  type DirectoryCandidate,
-  type MatchRange,
-  type MatchResult,
-  type SessionCandidate,
-} from "./matcher.js";
-import { splitPath } from "./paths.js";
-import { splitCommand } from "./toolIcon.js";
-import { abbreviateCwd, sessionName, sessionTreePath, type Session } from "./types.js";
-
-/** A matcher candidate that remembers what it came from, so a result can be
- *  acted on without a second lookup. The extra property is invisible to the
- *  matcher, which only ever reads `kind` and `fields`. */
-export type SessionBarCandidate = SessionCandidate & { session: Session };
-export type CommandBarCandidate = CommandCandidate & { command: Command };
-/** `fields.path` is the abbreviated path the operator reads and the matcher
- *  ranks; `path` is the one a spawn is made in. */
-export type DirectoryBarCandidate = DirectoryCandidate & { path: string };
-
-/** One row of a session's action page. It is a `command` to the matcher — a
- *  single `label` field, ranked exactly like a registry command — and carries
- *  the action it stands for instead of a registry entry. */
-export type ActionBarCandidate = CommandCandidate & { action: SessionAction };
-
-export type BarCandidate =
-  SessionBarCandidate | CommandBarCandidate | ActionBarCandidate | DirectoryBarCandidate;
-export type BarResult = MatchResult<BarCandidate>;
-
-/** Raised when Enter lands on a directory row. The bar picks the directory; the
- *  shell owns the spawn, which is the same fast-forward path `N` takes. */
-export const SPAWN_DIRECTORY_EVENT = "cmdbar-spawn-directory";
-
-/** One kind's slice of the ranked list, in rank order. */
-export interface BarGroup<C extends BarCandidate = BarCandidate> {
-  kind: CandidateKind;
-  title: string;
-  results: MatchResult<C>[];
-}
-
-const KIND_TITLES: Record<CandidateKind, string> = {
-  session: "Sessions",
-  command: "Commands",
-  directory: "Directories",
-};
-
-// ---- the sigils ----
-
-export type BarSigil = ">" | "~";
-
-export interface BarQuery {
-  /** The sigil in force, or null for the mixed list. */
-  sigil: BarSigil | null;
-  /** What the matcher sees: everything after a sigil, or the whole query. */
-  query: string;
-}
-
-/** Split a raw query line into its sigil and the query proper.
- *
- *  A sigil is only a sigil in first position: `>` or `~` anywhere else is a
- *  literal query character, which is what a directory query with a second `~`
- *  in it depends on. Backspacing past a sigil needs no special case either —
- *  the first character goes and the query is a mixed one again. */
-export function parseBarQuery(raw: string): BarQuery {
-  const first = raw[0];
-  if (first === ">" || first === "~") return { sigil: first, query: raw.slice(1) };
-  return { sigil: null, query: raw };
-}
-
-// ---- the session action page ----
-
-/** The actions a session's action page offers, and no others: the bar picks
- *  one and hands off to the flow that already implements it
- *  (docs/COMMAND-BAR.md, "Drill-in"). */
-export type SessionActionId = "kill" | "rename" | "spawn-similar";
-
-export interface SessionAction {
-  id: SessionActionId;
-  label: string;
-}
-
-export const SESSION_ACTIONS: readonly SessionAction[] = [
-  { id: "kill", label: "Kill session" },
-  { id: "rename", label: "Rename session" },
-  { id: "spawn-similar", label: "Spawn similar" },
-];
-
-/** The action page's candidates, in the order above — which is the order an
- *  empty query lists them in, since the matcher keeps input order. */
-export function sessionActionCandidates(): ActionBarCandidate[] {
-  return SESSION_ACTIONS.map((action) => ({
-    kind: "command",
-    action,
-    fields: { label: action.label },
-  }));
-}
-
-/** Narrow a `command` candidate to an action row. Both share the matcher's
- *  `command` kind, so what separates them is what they carry. */
-export function isActionCandidate(candidate: BarCandidate): candidate is ActionBarCandidate {
-  return candidate.kind === "command" && "action" in candidate;
-}
-
-// ---- candidates ----
-
-function focusedAt(s: Session): number | null {
-  const stamp = s.last_focused_at;
-  if (typeof stamp !== "string" || stamp === "") return null;
-  const ms = Date.parse(stamp);
-  return Number.isNaN(ms) ? null : ms;
-}
-
-function createdAt(s: Session): number {
-  const ms = Date.parse(s.created_at ?? "");
-  return Number.isNaN(ms) ? 0 : ms;
-}
-
-/** The empty-query order (docs/COMMAND-BAR.md, "Empty query"): most recently
- *  focused first; a session that has never been focused sorts after every
- *  session that has, most recently created first among those; and a dead
- *  session sorts after every live one regardless of recency, because a session
- *  you cannot attach to is not where you just were.
- *
- *  This is also the input order for a non-empty query, which is what the
- *  matcher's last tie-break preserves. */
-export function orderSessionsForBar(sessions: readonly Session[]): Session[] {
-  return [...sessions].sort((a, b) => {
-    const deadA = a.status === "Dead" ? 1 : 0;
-    const deadB = b.status === "Dead" ? 1 : 0;
-    if (deadA !== deadB) return deadA - deadB;
-
-    const focusA = focusedAt(a);
-    const focusB = focusedAt(b);
-    if ((focusA === null) !== (focusB === null)) return focusA === null ? 1 : -1;
-    if (focusA !== null && focusB !== null && focusA !== focusB) return focusB - focusA;
-
-    return createdAt(b) - createdAt(a);
-  });
-}
-
-/** Build one session's candidate: the fields docs/COMMAND-BAR.md's candidate
- *  table names, with the directory abbreviated the way the sidebar shows it. */
-export function sessionCandidate(s: Session, homeDir?: string): SessionBarCandidate {
-  const treePath = sessionTreePath(s);
-  const directory = treePath ? abbreviateCwd(treePath, homeDir) : undefined;
-  const tool = splitCommand(s.command).tool ?? undefined;
-  return {
-    kind: "session",
-    session: s,
-    fields: {
-      name: sessionName(s),
-      ...(directory ? { directory } : {}),
-      ...(s.command ? { command: s.command } : {}),
-      ...(tool ? { tool } : {}),
-    },
-  };
-}
-
-/** Every session as a candidate, in the empty-query order. */
-export function sessionBarCandidates(
-  sessions: readonly Session[],
-  homeDir?: string,
-): SessionBarCandidate[] {
-  return orderSessionsForBar(sessions).map((s) => sessionCandidate(s, homeDir));
-}
-
-/** Drop the commands that would list twice. Several chords can be bound to one
- *  action — the registry already carries its aliases on one entry, but nothing
- *  stops two entries running the same handler, and listed naively that is two
- *  identical rows. The dedupe is by **action**, never by chord: the chord is
- *  displayed, so a command with two of them is still one row. */
-export function dedupeCommands(commands: readonly Command[]): Command[] {
-  const seenRun = new Set<Command["run"]>();
-  const seenLabel = new Set<string>();
-  const kept: Command[] = [];
-  for (const command of commands) {
-    if (seenRun.has(command.run) || seenLabel.has(command.label)) continue;
-    seenRun.add(command.run);
-    seenLabel.add(command.label);
-    kept.push(command);
-  }
-  return kept;
-}
-
-/** Every bound command as a candidate, in registry order. Only the label is a
- *  field: the chord is displayed beside the row, never matched, because
- *  matching it would make `>` results depend on a user's rebinds. */
-export function commandBarCandidates(commands: readonly Command[]): CommandBarCandidate[] {
-  return dedupeCommands(commands).map((command) => ({
-    kind: "command",
-    command,
-    fields: { label: command.label },
-  }));
-}
-
-/** `~/dev/api` back to `/home/me/dev/api` — the inverse of `abbreviateCwd`, for
- *  a path the operator typed or `/api/dirs` completed. */
-export function expandHome(path: string, homeDir?: string): string {
-  if (!homeDir) return path;
-  if (path === "~") return homeDir;
-  return path.startsWith("~/") ? `${homeDir}${path.slice(1)}` : path;
-}
-
-export function directoryCandidate(path: string, homeDir?: string): DirectoryBarCandidate {
-  const absolute = expandHome(path, homeDir);
-  return { kind: "directory", path: absolute, fields: { path: abbreviateCwd(absolute, homeDir) } };
-}
-
-/** Candidates for `~`, deduped by the directory they spawn in and keeping the
- *  first mention of each — recent dirs (newest first) ahead of the project
- *  list, which is the empty-query order the contract asks for. */
-export function directoryBarCandidates(
-  paths: readonly string[],
-  homeDir?: string,
-): DirectoryBarCandidate[] {
-  const seen = new Set<string>();
-  const out: DirectoryBarCandidate[] = [];
-  for (const path of paths) {
-    if (path === "") continue;
-    const candidate = directoryCandidate(path, homeDir);
-    if (seen.has(candidate.path)) continue;
-    seen.add(candidate.path);
-    out.push(candidate);
-  }
-  return out;
-}
-
-/** The directory list the bar starts from: what the spawn form already knows —
- *  `GET /api/recent-dirs` and the project list — either alone if the other
- *  fails. */
-export async function loadBarDirectories(): Promise<string[]> {
-  const [recents, discovered] = await Promise.all([
-    recentDirs()
-      .then((r) => r.dirs.map((d) => d.cwd))
-      .catch(() => [] as string[]),
-    fetchProjects()
-      .then((list) => list.map((p) => p.path))
-      .catch(() => [] as string[]),
-  ]);
-  return [...recents, ...discovered];
-}
-
-// ---- grouping ----
-
-/** Bucket a ranked list by kind for rendering. Grouping is a rendering of the
- *  ranking, never a reordering of it: a group holds its matches in rank order,
- *  and groups appear in the order their best-scoring member does — so the first
- *  row under the first header is the globally best result. */
-export function barGroups<C extends BarCandidate>(
-  results: readonly MatchResult<C>[],
-): BarGroup<C>[] {
-  const groups: BarGroup<C>[] = [];
-  for (const result of results) {
-    const kind = result.candidate.kind;
-    let group = groups.find((g) => g.kind === kind);
-    if (!group) {
-      group = { kind, title: KIND_TITLES[kind], results: [] };
-      groups.push(group);
-    }
-    group.results.push(result);
-  }
-  return groups;
-}
-
-/** The rows a query produces, flat and in rank order — what the highlight walks
- *  and what Enter acts on. Headers are labels, not rows, so they are never in
- *  this list. */
-export function barRows<C extends BarCandidate>(
-  query: string,
-  candidates: readonly C[],
-): MatchResult<C>[] {
-  return matchAndRank(query, candidates);
-}
-
-// ---- rendering ----
-
-/** Text with its matched ranges wrapped in `<mark>`. Ranges come from the
- *  matcher as `[start, end)` character pairs over the field that won. */
-export function renderHighlighted(text: string, ranges: readonly MatchRange[]): DocumentFragment {
-  const frag = document.createDocumentFragment();
-  let cursor = 0;
-  for (const [start, end] of ranges) {
-    if (start > cursor) frag.append(text.slice(cursor, start));
-    const mark = document.createElement("mark");
-    mark.className = "cmdbar-hit";
-    mark.textContent = text.slice(start, end);
-    frag.append(mark);
-    cursor = end;
-  }
-  if (cursor < text.length) frag.append(text.slice(cursor));
-  return frag;
-}
-
-/** The name line of a row: the session's name, the command's label, or the
- *  directory's path. */
-function rowName(candidate: BarCandidate): string {
-  switch (candidate.kind) {
-    case "session":
-      return candidate.fields.name;
-    case "command":
-      return candidate.fields.label;
-    case "directory":
-      return candidate.fields.path;
-  }
-}
-
-/** The secondary line under a session row: the field the match was found in
- *  when that was not the name, so a session found through its directory says
- *  so. Only sessions have one — a command shows keycaps instead, and a
- *  directory's path is already the name. */
-function metaText(result: BarResult): string | undefined {
-  if (result.candidate.kind !== "session") return undefined;
-  const fields = result.candidate.fields;
-  switch (result.field) {
-    case "directory":
-      return fields.directory;
-    case "command":
-      return fields.command;
-    case "tool":
-      return fields.tool;
-    default:
-      return fields.directory;
-  }
-}
-
-function renderRow(result: BarResult, index: number): HTMLElement {
-  const candidate = result.candidate;
-  const row = document.createElement("div");
-  row.className = "cmdbar-row";
-  row.setAttribute("role", "option");
-  row.id = `cmdbar-row-${index}`;
-  row.dataset.index = String(index);
-  row.dataset.kind = candidate.kind;
-  if (candidate.kind === "session") {
-    row.dataset.sessionId = candidate.session.id;
-    if (candidate.session.status === "Dead") row.classList.add("is-dead");
-  } else if (isActionCandidate(candidate)) {
-    row.dataset.actionId = candidate.action.id;
-  } else if (candidate.kind === "command") {
-    row.dataset.commandId = candidate.command.id;
-  } else {
-    row.dataset.path = candidate.path;
-  }
-
-  const name = document.createElement("span");
-  name.className = "cmdbar-row-name";
-  const nameText = rowName(candidate);
-  const nameMatched =
-    result.field === "name" || result.field === "label" || result.field === "path";
-  name.append(nameMatched ? renderHighlighted(nameText, result.ranges) : nameText);
-  row.appendChild(name);
-
-  // The chord is teaching material, not a match target: it is rendered from
-  // the live registry entry and never fed to the matcher.
-  if (candidate.kind === "command" && !isActionCandidate(candidate)) {
-    const keys = document.createElement("span");
-    keys.className = "cmdbar-row-keys";
-    for (const cap of keyCaps(candidate.command.keys[0])) {
-      const kbd = document.createElement("kbd");
-      kbd.textContent = cap;
-      keys.appendChild(kbd);
-    }
-    row.appendChild(keys);
-    return row;
-  }
-
-  const meta = metaText(result);
-  if (meta) {
-    const el = document.createElement("span");
-    el.className = "cmdbar-row-meta";
-    const highlighted = result.field !== undefined && result.field !== "name";
-    el.append(highlighted ? renderHighlighted(meta, result.ranges) : meta);
-    row.appendChild(el);
-  }
-  return row;
-}
-
-const PLACEHOLDERS: Record<"mixed" | BarSigil, string> = {
-  mixed: "Go to a session…",
-  ">": "Run a command…",
-  "~": "Spawn in a directory…",
-};
-
-// ---- the overlay ----
-
-export interface CommandBarOptions {
-  /** Sessions to build candidates from, as the store has them right now. */
-  sessions: readonly Session[];
-  /** The daemon's home dir, for the directory field's `~/…` abbreviation. */
-  homeDir?: string;
-  /** Open the highlighted session. Defaults to the shared open path — the
-   *  sidebar's click event — which is what the contract requires; tests pass
-   *  their own. */
-  onOpenSession?: (sessionId: string) => void;
-  /** The command registry to list under `>`. Defaults to every bound command,
-   *  in registry order. */
-  commands?: readonly Command[];
-  /** The directory list behind `~`, fetched once on first use. */
-  loadDirectories?: () => Promise<string[]>;
-  /** One directory's subdirectories, for filling the list in as a path is
-   *  typed. Defaults to `GET /api/dirs`. */
-  listDirEntries?: (dir: string) => Promise<string[]>;
-  /** Spawn a session in the highlighted directory. Defaults to raising
-   *  `SPAWN_DIRECTORY_EVENT`, which the shell turns into a fast-forward
-   *  spawn. */
-  onSpawnDirectory?: (path: string) => void;
-  /** The action page's three actions (#151). Each defaults to raising the
-   *  event the flow that already implements it listens on — the sidebar's
-   *  confirm-and-blockers kill, its inline rename prompt, the spawn form
-   *  seeded from the session. The bar picks the action and nothing more. */
-  onKillSession?: (session: Session) => void;
-  onRenameSession?: (session: Session) => void;
-  onSpawnSimilar?: (session: Session) => void;
-}
-
-interface OpenBar {
-  el: HTMLElement;
-  dispose: () => void;
-}
-
-let current: OpenBar | null = null;
-
-export function isCommandBarOpen(): boolean {
-  return current !== null;
-}
-
-export function closeCommandBar(): void {
-  current?.dispose();
-}
-
-/** Mount the bar. Opening while one is up replaces it, so a stray second call
- *  can never stack two overlays. */
-export function openCommandBar(opts: CommandBarOptions): HTMLElement {
-  closeCommandBar();
-
-  // Closing returns the keyboard to whatever held it when the bar opened: a
-  // round trip through the bar never silently moves focus.
-  const previouslyFocused = document.activeElement as HTMLElement | null;
-  const openSession =
-    opts.onOpenSession ??
-    ((id: string) => document.dispatchEvent(new CustomEvent(SESSION_SELECT_EVENT, { detail: id })));
-  const spawnDirectory =
-    opts.onSpawnDirectory ??
-    ((path: string) =>
-      document.dispatchEvent(new CustomEvent(SPAWN_DIRECTORY_EVENT, { detail: path })));
-  const sessionEvent =
-    (name: string) =>
-    (session: Session): void => {
-      document.dispatchEvent(new CustomEvent(name, { detail: session }));
-    };
-  const killSession = opts.onKillSession ?? sessionEvent(KILL_SESSION_EVENT);
-  const renameSession = opts.onRenameSession ?? sessionEvent(RENAME_SESSION_EVENT);
-  const spawnSimilar = opts.onSpawnSimilar ?? sessionEvent(SPAWN_SIMILAR_EVENT);
-  const loadDirectories = opts.loadDirectories ?? loadBarDirectories;
-  const listEntries =
-    opts.listDirEntries ?? ((dir: string) => listDir(dir).then((listing) => listing.entries));
-
-  const sessionCandidates: SessionBarCandidate[] = sessionBarCandidates(
-    opts.sessions,
-    opts.homeDir,
-  );
-  const commandCandidates: CommandBarCandidate[] = commandBarCandidates(
-    opts.commands ?? publishedCommands(),
-  );
-
-  const el = document.createElement("div");
-  el.className = "cmdbar-overlay";
-  el.setAttribute("role", "dialog");
-  el.setAttribute("aria-modal", "true");
-  el.setAttribute("aria-label", "Command bar");
-
-  const panel = document.createElement("div");
-  panel.className = "cmdbar-panel";
-
-  const input = document.createElement("input");
-  input.type = "text";
-  input.className = "cmdbar-input";
-  input.setAttribute("role", "combobox");
-  input.setAttribute("aria-expanded", "true");
-  input.setAttribute("aria-controls", "cmdbar-results");
-  input.setAttribute("aria-label", "Search sessions, commands and directories");
-  input.setAttribute("autocomplete", "off");
-  input.spellcheck = false;
-  input.placeholder = PLACEHOLDERS.mixed;
-
-  const results = document.createElement("div");
-  results.className = "cmdbar-results";
-  results.id = "cmdbar-results";
-  results.setAttribute("role", "listbox");
-
-  panel.append(input, results);
-  el.appendChild(panel);
-  document.body.appendChild(el);
-
-  let rows: BarResult[] = [];
-  let highlighted = 0;
-
-  // The action page (#151). `page` is the session being acted on, `stashed`
-  // the result-list query it was drilled into from — backing out restores it,
-  // so the round trip costs the operator nothing.
-  let page: Session | null = null;
-  let stashed = "";
-  let header: HTMLElement | null = null;
-
-  // `~`'s candidates: the recents-and-projects list, fetched once, plus
-  // whatever `/api/dirs` has filled in for the directory being typed.
-  let directories: DirectoryBarCandidate[] = [];
-  let directoriesRequested = false;
-  let probed: DirectoryBarCandidate[] = [];
-  let probedDir: string | null = null;
-  const listings = new Map<string, string[]>();
-
-  function alive(): boolean {
-    return current?.el === el;
-  }
-
-  /** Fetch the recents-and-projects list the first time `~` is used. */
-  function ensureDirectories(): void {
-    if (directoriesRequested) return;
-    directoriesRequested = true;
-    loadDirectories()
-      .then((paths) => {
-        directories = directoryBarCandidates(paths, opts.homeDir);
-        if (alive()) render();
-      })
-      .catch(() => {
-        /* no directories is a shorter list, not an error state */
-      });
-  }
-
-  /** Fill the list in from `GET /api/dirs` once the query looks like a path:
-   *  the directory it names is listed and its children join the candidates, so
-   *  `~` reaches a directory that was never spawned in. */
-  function probeDirectories(query: string): void {
-    const { dir } = splitPath(query);
-    if (dir === "") {
-      probed = [];
-      probedDir = null;
-      return;
-    }
-    if (dir === probedDir) return;
-    probedDir = dir;
-    const cached = listings.get(dir);
-    if (cached) {
-      probed = directoryBarCandidates(
-        cached.map((entry) => `${dir}${entry}`),
-        opts.homeDir,
-      );
-      return;
-    }
-    probed = [];
-    listEntries(dir)
-      .then((entries) => {
-        listings.set(dir, entries);
-        if (!alive() || probedDir !== dir) return;
-        probed = directoryBarCandidates(
-          entries.map((entry) => `${dir}${entry}`),
-          opts.homeDir,
-        );
-        render();
-      })
-      .catch(() => {
-        /* an unreadable directory contributes nothing */
-      });
-  }
-
-  /** What the matcher sees for the query line as it stands. With no sigil the
-   *  list is mixed — sessions and commands together — except on an empty query,
-   *  where the bar is a session switcher. */
-  function candidatesFor(parsed: BarQuery): BarCandidate[] {
-    if (page) return sessionActionCandidates();
-    switch (parsed.sigil) {
-      case ">":
-        return [...commandCandidates];
-      case "~": {
-        ensureDirectories();
-        probeDirectories(parsed.query);
-        const seen = new Set<string>();
-        return [...directories, ...probed].filter((c) =>
-          seen.has(c.path) ? false : (seen.add(c.path), true),
-        );
-      }
-      default:
-        return parsed.query === ""
-          ? [...sessionCandidates]
-          : [...sessionCandidates, ...commandCandidates];
-    }
-  }
-
-  function paintHighlight(): void {
-    for (const row of results.querySelectorAll<HTMLElement>(".cmdbar-row")) {
-      const active = Number(row.dataset.index) === highlighted;
-      row.classList.toggle("is-active", active);
-      row.setAttribute("aria-selected", active ? "true" : "false");
-      if (active) {
-        row.scrollIntoView({ block: "nearest" });
-        input.setAttribute("aria-activedescendant", row.id);
-      }
-    }
-    if (rows.length === 0) input.removeAttribute("aria-activedescendant");
-  }
-
-  /** The line naming the session being acted on, so the target is never
-   *  ambiguous. Present only while the action page is up. */
-  function paintHeader(): void {
-    header?.remove();
-    header = null;
-    if (!page) return;
-    header = document.createElement("div");
-    header.className = "cmdbar-page-header";
-    header.setAttribute("role", "presentation");
-    header.textContent = `Actions for "${sessionName(page)}"`;
-    panel.insertBefore(header, results);
-  }
-
-  function render(): void {
-    // On the action page the query line is over the three actions, so there is
-    // no sigil to read: `>` and `~` are ordinary characters there.
-    const parsed = page ? { sigil: null, query: input.value } : parseBarQuery(input.value);
-    input.placeholder = page
-      ? `Act on ${sessionName(page)}…`
-      : PLACEHOLDERS[parsed.sigil ?? "mixed"];
-    paintHeader();
-    rows = barRows(parsed.query, candidatesFor(parsed));
-    // The highlight starts on the globally best row every time the list
-    // changes: an old index would point at a different result.
-    highlighted = 0;
-    results.replaceChildren();
-
-    if (rows.length === 0) {
-      const empty = document.createElement("div");
-      empty.className = "cmdbar-empty";
-      empty.textContent = "No matches";
-      results.appendChild(empty);
-      paintHighlight();
-      return;
-    }
-
-    let index = 0;
-    for (const group of barGroups(rows)) {
-      // While a sigil is in force there is one kind, so the header is
-      // dropped — and the action page is one kind too.
-      if (parsed.sigil === null && !page) {
-        const header = document.createElement("div");
-        header.className = "cmdbar-group-title";
-        header.setAttribute("role", "presentation");
-        header.textContent = group.title;
-        results.appendChild(header);
-      }
-      for (const result of group.results) {
-        const at = index;
-        const row = renderRow(result, at);
-        row.addEventListener("click", () => activate(at));
-        results.appendChild(row);
-        index += 1;
-      }
-    }
-    paintHighlight();
-  }
-
-  /** The highlight does not wrap: it stops at the first and last row. */
-  function move(delta: number): void {
-    if (rows.length === 0) return;
-    highlighted = Math.min(rows.length - 1, Math.max(0, highlighted + delta));
-    paintHighlight();
-  }
-
-  /** `tab`: drill into the highlighted session's action page. No effect on any
-   *  other kind, and none on the page itself, which has no session rows. */
-  function drillIn(): void {
-    const candidate = rows[highlighted]?.candidate;
-    if (page || candidate?.kind !== "session") return;
-    page = candidate.session;
-    stashed = input.value;
-    input.value = "";
-    render();
-  }
-
-  /** Escape, or backspace at an empty query: back to the result list with the
-   *  query the drill-in was made from. */
-  function leavePage(): void {
-    page = null;
-    input.value = stashed;
-    stashed = "";
-    render();
-  }
-
-  function runAction(action: SessionAction, session: Session): void {
-    close();
-    switch (action.id) {
-      case "kill":
-        killSession(session);
-        return;
-      case "rename":
-        renameSession(session);
-        return;
-      case "spawn-similar":
-        spawnSimilar(session);
-        return;
-    }
-  }
-
-  function activate(index: number): void {
-    const result = rows[index];
-    if (!result) return;
-    const candidate = result.candidate;
-    if (isActionCandidate(candidate)) {
-      // The page cannot be up without a session to act on.
-      if (page) runAction(candidate.action, page);
-      return;
-    }
-    close();
-    switch (candidate.kind) {
-      case "session":
-        openSession(candidate.session.id);
-        return;
-      case "command":
-        candidate.command.run();
-        return;
-      case "directory":
-        spawnDirectory(candidate.path);
-        return;
-    }
-  }
-
-  function onKeydown(e: KeyboardEvent): void {
-    switch (e.key) {
-      case "Escape":
-        e.preventDefault();
-        // On an action page Escape is one level up, not the way out.
-        if (page) leavePage();
-        else close();
-        return;
-      case "Tab":
-        e.preventDefault();
-        drillIn();
-        return;
-      case "Backspace":
-        // Ordinary editing, except at an empty query on the action page.
-        if (page && input.value === "") {
-          e.preventDefault();
-          leavePage();
-        }
-        return;
-      case "Enter":
-        e.preventDefault();
-        activate(highlighted);
-        return;
-      case "ArrowDown":
-        e.preventDefault();
-        move(1);
-        return;
-      case "ArrowUp":
-        e.preventDefault();
-        move(-1);
-        return;
-      case "n":
-        if (e.ctrlKey) {
-          e.preventDefault();
-          move(1);
-        }
-        return;
-      case "p":
-        if (e.ctrlKey) {
-          e.preventDefault();
-          move(-1);
-        }
-        return;
-    }
-  }
-
-  function close(): void {
-    if (current?.el !== el) return;
-    current = null;
-    el.remove();
-    // Restoring focus is what makes the bar a view over the app rather than a
-    // place in it; a detached node cannot take it.
-    if (previouslyFocused?.isConnected) previouslyFocused.focus();
-  }
-
-  input.addEventListener("keydown", onKeydown);
-  input.addEventListener("input", render);
-  // A press on the scrim closes; one inside the panel is left alone.
-  el.addEventListener("mousedown", (ev) => {
-    if (!panel.contains(ev.target as Node)) close();
-  });
-
-  current = { el, dispose: close };
-  render();
-  input.focus();
-  return el;
-}

web/src/components/commandBar/ActionPage.tsx

@@ -0,0 +1,34 @@
+// A session's action page (docs/COMMAND-BAR.md, "Drill-in"): the same overlay
+// over kill, rename and spawn similar, still fuzzy searchable. The page names
+// the session it acts on, so the target is never ambiguous.
+
+import { sessionName, type Session } from "../../types.js";
+import { ResultList } from "./ResultList.js";
+import type { BarGroup } from "./model.js";
+
+export interface ActionPageProps {
+  session: Session;
+  /** The three actions, ranked by the query line — one kind, so no headers. */
+  groups: BarGroup[];
+  highlighted: number;
+  onActivate(index: number): void;
+}
+
+export function ActionPage({ session, groups, highlighted, onActivate }: ActionPageProps) {
+  return (
+    <>
+      <div
+        role="presentation"
+        className="cmdbar-page-header border-b border-border px-sp-3 py-sp-1 text-fs-11 text-muted"
+      >
+        {`Actions for "${sessionName(session)}"`}
+      </div>
+      <ResultList
+        groups={groups}
+        showHeaders={false}
+        highlighted={highlighted}
+        onActivate={onActivate}
+      />
+    </>
+  );
+}

web/src/components/commandBar/CommandBar.test.tsx

@@ -0,0 +1,407 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import {
+  KILL_SESSION_EVENT,
+  RENAME_SESSION_EVENT,
+  SESSION_SELECT_EVENT,
+  SPAWN_SIMILAR_EVENT,
+} from "../../uiEvents.js";
+import { COMMAND_SPECS, type Command } from "../../commands.js";
+import type { Session } from "../../types.js";
+import { CommandBar, SPAWN_DIRECTORY_EVENT, type CommandBarProps } from "./CommandBar.js";
+
+vi.mock("../../api.js", async (importOriginal) => ({
+  ...(await importOriginal<Record<string, unknown>>()),
+  listDir: vi.fn(async () => ({ path: "", entries: [] })),
+  projects: vi.fn(async () => []),
+  recentDirs: vi.fn(async () => ({ dirs: [] })),
+}));
+
+function session(id: string, over: Partial<Session> = {}): Session {
+  return {
+    id,
+    cwd: "/home/me/dev/api",
+    command: "bash",
+    env: {},
+    metadata: { name: id },
+    status: "Running",
+    created_at: "2026-01-01T00:00:00Z",
+    ...over,
+  };
+}
+
+function command(over: Partial<Command> = {}): Command {
+  return {
+    id: "cmd",
+    label: "A command",
+    group: "Test",
+    keys: ["a"],
+    scope: "global",
+    run: () => {},
+    ...over,
+  };
+}
+
+const sessions = [
+  session("api", { current_cwd: "/home/me/dev/api", last_focused_at: "2026-01-01T11:00:00Z" }),
+  session("worker", {
+    current_cwd: "/home/me/dev/worker",
+    last_focused_at: "2026-01-01T10:00:00Z",
+  }),
+  session("notes", { current_cwd: "/home/me/notes" }),
+];
+
+function open(over: Partial<CommandBarProps> = {}) {
+  return render(
+    <CommandBar
+      sessions={sessions}
+      homeDir="/home/me"
+      commands={[]}
+      onOpenSession={() => {}}
+      onClose={() => {}}
+      {...over}
+    />,
+  );
+}
+
+function input(): HTMLInputElement {
+  return screen.getByRole("combobox") as HTMLInputElement;
+}
+
+function type(value: string): void {
+  fireEvent.change(input(), { target: { value } });
+}
+
+function press(key: string, init: Record<string, unknown> = {}): void {
+  fireEvent.keyDown(input(), { key, ...init });
+}
+
+function rowNames(): string[] {
+  return [...document.querySelectorAll(".cmdbar-row-name")].map((r) => r.textContent ?? "");
+}
+
+function activeName(): string | undefined {
+  return document.querySelector(".cmdbar-row.is-active .cmdbar-row-name")?.textContent ?? undefined;
+}
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+describe("the overlay", () => {
+  it("is a registry command, so the help overlay lists it", () => {
+    const spec = COMMAND_SPECS.find((s) => s.id === "bar.open");
+    expect(spec?.keys).toEqual(["ctrl-k"]);
+    expect(spec?.scope).toBe("global");
+  });
+
+  it("lists sessions by recency under a kind header on an empty query", () => {
+    open();
+    expect([...document.querySelectorAll(".cmdbar-group-title")].map((h) => h.textContent)).toEqual([
+      "Sessions",
+    ]);
+    expect(rowNames()).toEqual(["api", "worker", "notes"]);
+    expect(activeName()).toBe("api");
+  });
+
+  it("ranks a typed query through the matcher and highlights the matched range", () => {
+    open();
+    type("wor");
+    expect(rowNames()).toEqual(["worker"]);
+    expect([...document.querySelectorAll(".cmdbar-row-name mark")].map((m) => m.textContent)).toEqual(
+      ["wor"],
+    );
+  });
+
+  it("highlights inside the directory when that is the field that matched", () => {
+    open();
+    type("dev/wor");
+    expect(rowNames()).toEqual(["worker"]);
+    expect(
+      [...document.querySelectorAll(".cmdbar-row-meta mark")].map((m) => m.textContent).join(""),
+    ).toBe("dev/wor");
+  });
+
+  it("renders a no-results state rather than an empty list", () => {
+    open();
+    type("zzz");
+    expect(rowNames()).toEqual([]);
+    expect(screen.getByText("No matches")).toBeDefined();
+  });
+
+  it("moves the highlight with the arrows and ctrl-p/ctrl-n, without wrapping", () => {
+    open();
+    press("ArrowUp");
+    expect(activeName()).toBe("api");
+    press("ArrowDown");
+    expect(activeName()).toBe("worker");
+    press("n", { ctrlKey: true });
+    expect(activeName()).toBe("notes");
+    press("ArrowDown");
+    expect(activeName()).toBe("notes");
+    press("p", { ctrlKey: true });
+    expect(activeName()).toBe("worker");
+  });
+
+  it("puts the highlight back on the best row whenever the query changes", () => {
+    open();
+    press("ArrowDown");
+    expect(activeName()).toBe("worker");
+    type("o");
+    expect(activeName()).toBe(rowNames()[0]);
+  });
+
+  it("opens the highlighted session through the caller's open path on Enter", () => {
+    const onOpenSession = vi.fn();
+    const onClose = vi.fn();
+    open({ onOpenSession, onClose });
+    press("ArrowDown");
+    press("Enter");
+    expect(onOpenSession).toHaveBeenCalledWith("worker");
+    expect(onClose).toHaveBeenCalled();
+  });
+
+  it("raises the shared select event when the caller supplies no handler", () => {
+    const listener = vi.fn();
+    document.addEventListener(SESSION_SELECT_EVENT, listener);
+    open({ onOpenSession: undefined });
+    press("Enter");
+    document.removeEventListener(SESSION_SELECT_EVENT, listener);
+    expect((listener.mock.calls[0][0] as CustomEvent).detail).toBe("api");
+  });
+
+  it("Enter on an empty result list does nothing", () => {
+    const onOpenSession = vi.fn();
+    const onClose = vi.fn();
+    open({ onOpenSession, onClose });
+    type("zzz");
+    press("Enter");
+    expect(onOpenSession).not.toHaveBeenCalled();
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("closes on Escape and on a press outside the panel", () => {
+    const onClose = vi.fn();
+    open({ onClose });
+    press("Escape");
+    expect(onClose).toHaveBeenCalledTimes(1);
+    fireEvent.mouseDown(document.querySelector(".cmdbar-overlay") as HTMLElement);
+    expect(onClose).toHaveBeenCalledTimes(2);
+  });
+
+  it("stays open for a press inside the panel", () => {
+    const onClose = vi.fn();
+    open({ onClose });
+    fireEvent.mouseDown(document.querySelector(".cmdbar-panel") as HTMLElement);
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("returns the keyboard to whatever held it when it opened", () => {
+    const before = document.createElement("input");
+    document.body.appendChild(before);
+    before.focus();
+    const view = open();
+    expect(document.activeElement).toBe(input());
+    view.unmount();
+    expect(document.activeElement).toBe(before);
+    before.remove();
+  });
+
+  it("clicking a row opens that session", () => {
+    const onOpenSession = vi.fn();
+    open({ onOpenSession });
+    fireEvent.click(document.querySelectorAll(".cmdbar-row")[1]);
+    expect(onOpenSession).toHaveBeenCalledWith("worker");
+  });
+});
+
+describe("the sigils", () => {
+  const commands = [
+    command({ id: "help.toggle", label: "Show help", keys: ["?"] }),
+    command({ id: "spawn.open", label: "Open the spawn form", keys: ["n"], run: vi.fn() }),
+  ];
+
+  it("lists every command in registry order under `>`, with its chord and no header", () => {
+    open({ commands });
+    type(">");
+    expect(rowNames()).toEqual(["Show help", "Open the spawn form"]);
+    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
+    expect([...document.querySelectorAll(".cmdbar-row-keys kbd")].map((k) => k.textContent)).toEqual(
+      ["?", "n"],
+    );
+  });
+
+  it("matches a command on its label and never on its chord", () => {
+    open({ commands });
+    type(">help");
+    expect(rowNames()).toEqual(["Show help"]);
+    type(">?");
+    expect(rowNames()).toEqual([]);
+  });
+
+  it("runs the highlighted command on Enter", () => {
+    const run = vi.fn();
+    open({ commands: [command({ label: "Run me", run })] });
+    type(">run");
+    press("Enter");
+    expect(run).toHaveBeenCalled();
+  });
+
+  it("keeps the list mixed with no sigil, and returns to it when the sigil goes", () => {
+    open({ commands });
+    type(">show");
+    expect(rowNames()).toEqual(["Show help"]);
+    type("");
+    expect(rowNames()).toEqual(["api", "worker", "notes"]);
+  });
+
+  it("lists recent dirs then projects under `~`", async () => {
+    open({ loadDirectories: async () => ["/home/me/dev/api", "/srv/x"] });
+    type("~");
+    await waitFor(() => expect(rowNames()).toEqual(["~/dev/api", "/srv/x"]));
+    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
+  });
+
+  it("fills the list in from /api/dirs as a path is typed", async () => {
+    const listDirEntries = vi.fn(async () => ["maestro", "api"]);
+    open({ loadDirectories: async () => ["/home/me/notes"], listDirEntries });
+    // The second `~` is a literal query character and reaches the matcher.
+    type("~~/dev/mae");
+    await waitFor(() => expect(rowNames()).toEqual(["~/dev/maestro"]));
+    expect(listDirEntries).toHaveBeenCalledWith("~/dev/");
+  });
+
+  it("spawns in the highlighted directory on Enter", async () => {
+    const onSpawnDirectory = vi.fn();
+    open({ loadDirectories: async () => ["/srv/x"], onSpawnDirectory });
+    type("~");
+    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
+    press("Enter");
+    expect(onSpawnDirectory).toHaveBeenCalledWith("/srv/x");
+  });
+
+  it("raises the spawn event when the caller supplies no handler", async () => {
+    const listener = vi.fn();
+    document.addEventListener(SPAWN_DIRECTORY_EVENT, listener);
+    open({ loadDirectories: async () => ["/srv/x"] });
+    type("~");
+    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
+    press("Enter");
+    document.removeEventListener(SPAWN_DIRECTORY_EVENT, listener);
+    expect((listener.mock.calls[0][0] as CustomEvent).detail).toBe("/srv/x");
+  });
+});
+
+describe("the session action page", () => {
+  function drill(over: Partial<CommandBarProps> = {}) {
+    const view = open(over);
+    press("Tab");
+    return view;
+  }
+
+  it("lists kill, rename and spawn similar for the highlighted session", () => {
+    drill();
+    expect(rowNames()).toEqual(["Kill session", "Rename session", "Spawn similar"]);
+  });
+
+  it("names the session being acted on", () => {
+    drill();
+    expect(screen.getByText('Actions for "api"')).toBeDefined();
+  });
+
+  it("drops the kind headers, since the page is one kind", () => {
+    drill();
+    expect(document.querySelectorAll(".cmdbar-group-title")).toHaveLength(0);
+  });
+
+  it("stays fuzzy-searchable over the three actions", () => {
+    drill();
+    type("ren");
+    expect(rowNames()).toEqual(["Rename session"]);
+  });
+
+  it("does nothing on a command row", () => {
+    open({ commands: [command({ label: "Show help" })] });
+    type(">show");
+    press("Tab");
+    expect(rowNames()).toEqual(["Show help"]);
+  });
+
+  it("does nothing on a directory row", async () => {
+    open({ loadDirectories: async () => ["/srv/x"] });
+    type("~");
+    await waitFor(() => expect(rowNames()).toEqual(["/srv/x"]));
+    press("Tab");
+    expect(rowNames()).toEqual(["/srv/x"]);
+  });
+
+  it("returns to the result list on Escape, with the previous query intact", () => {
+    const onClose = vi.fn();
+    open({ onClose });
+    type("wor");
+    press("Tab");
+    expect(rowNames()).toEqual(["Kill session", "Rename session", "Spawn similar"]);
+    press("Escape");
+    expect(onClose).not.toHaveBeenCalled();
+    expect(input().value).toBe("wor");
+    expect(rowNames()).toEqual(["worker"]);
+  });
+
+  it("returns to the result list on backspace at an empty query", () => {
+    drill();
+    fireEvent.keyDown(input(), { key: "Backspace" });
+    expect(rowNames()).toEqual(["api", "worker", "notes"]);
+  });
+
+  it("keeps backspace ordinary while the page's query has text", () => {
+    drill();
+    type("ren");
+    fireEvent.keyDown(input(), { key: "Backspace" });
+    expect(rowNames()).toEqual(["Rename session"]);
+  });
+
+  it("closes the bar when the page's Escape has already been used", () => {
+    const onClose = vi.fn();
+    drill({ onClose });
+    press("Escape");
+    press("Escape");
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+
+  it("raises kill, rename and spawn similar with the session, closing the bar", () => {
+    for (const [query, key] of [
+      ["kill", "onKillSession"],
+      ["rename", "onRenameSession"],
+      ["spawn", "onSpawnSimilar"],
+    ] as const) {
+      const handler = vi.fn();
+      const onClose = vi.fn();
+      drill({ [key]: handler, onClose });
+      type(query);
+      press("Enter");
+      expect(handler).toHaveBeenCalledWith(expect.objectContaining({ id: "api" }));
+      expect(onClose).toHaveBeenCalled();
+      cleanup();
+    }
+  });
+
+  it("hands each action to the flow it already has, by default", () => {
+    for (const [query, event] of [
+      ["kill", KILL_SESSION_EVENT],
+      ["rename", RENAME_SESSION_EVENT],
+      ["spawn", SPAWN_SIMILAR_EVENT],
+    ] as const) {
+      const listener = vi.fn();
+      document.addEventListener(event, listener);
+      drill();
+      type(query);
+      press("Enter");
+      document.removeEventListener(event, listener);
+      expect((listener.mock.calls[0][0] as CustomEvent).detail.id).toBe("api");
+      cleanup();
+    }
+  });
+});

web/src/components/commandBar/CommandBar.tsx

@@ -0,0 +1,379 @@
+// The `ctrl-k` command bar (docs/COMMAND-BAR.md): a query line over a result
+// list. Sessions and commands rank together by default; `>` narrows to
+// commands, `~` to directories. `tab` on a session drills into its action page.
+//
+// The bar picks an action and hands off — it never reimplements one. Each
+// handler defaults to the event the flow that already implements it listens
+// on, so the React bar and the legacy shell raise the same flows.
+
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+import { createPortal } from "react-dom";
+
+import {
+  KILL_SESSION_EVENT,
+  RENAME_SESSION_EVENT,
+  SESSION_SELECT_EVENT,
+  SPAWN_SIMILAR_EVENT,
+} from "../../uiEvents.js";
+import { publishedCommands, type Command } from "../../commands.js";
+import { sessionName, type Session } from "../../types.js";
+import { ActionPage } from "./ActionPage.js";
+import { ResultList } from "./ResultList.js";
+import {
+  barGroups,
+  barRows,
+  commandBarCandidates,
+  dirEntryPaths,
+  directoryBarCandidates,
+  isActionCandidate,
+  listDirEntries as defaultListDirEntries,
+  loadBarDirectories,
+  parseBarQuery,
+  probeDir,
+  sessionActionCandidates,
+  sessionBarCandidates,
+  PLACEHOLDERS,
+  type BarCandidate,
+  type BarResult,
+  type DirectoryBarCandidate,
+  type SessionAction,
+} from "./model.js";
+
+/** Raised when Enter lands on a directory row and no handler was given. The
+ *  bar picks the directory; the shell owns the spawn, which is the same
+ *  fast-forward path `N` takes. */
+export const SPAWN_DIRECTORY_EVENT = "cmdbar-spawn-directory";
+
+export interface CommandBarProps {
+  /** Sessions to build candidates from, as the store has them right now. */
+  sessions: readonly Session[];
+  /** The daemon's home dir, for the directory field's `~/…` abbreviation. */
+  homeDir?: string;
+  /** The command registry to list under `>`. Defaults to every bound command,
+   * in registry order. */
+  commands?: readonly Command[];
+  /** The directory list behind `~`, fetched once on first use. */
+  loadDirectories?: () => Promise<string[]>;
+  /** One directory's subdirectories, for filling the list in as a path is
+   * typed. Defaults to `GET /api/dirs`. */
+  listDirEntries?: (dir: string) => Promise<string[]>;
+  onOpenSession?(sessionId: string): void;
+  onSpawnDirectory?(path: string): void;
+  onKillSession?(session: Session): void;
+  onRenameSession?(session: Session): void;
+  onSpawnSimilar?(session: Session): void;
+  /** Closing returns the keyboard to whatever held it when the bar opened. */
+  onClose(): void;
+}
+
+function raise(name: string, detail: unknown): void {
+  document.dispatchEvent(new CustomEvent(name, { detail }));
+}
+
+export function CommandBar(props: CommandBarProps) {
+  const {
+    sessions,
+    homeDir,
+    commands,
+    loadDirectories = loadBarDirectories,
+    listDirEntries = defaultListDirEntries,
+    onClose,
+  } = props;
+
+  const inputRef = useRef<HTMLInputElement>(null);
+  const panelRef = useRef<HTMLDivElement>(null);
+
+  const [raw, setRaw] = useState("");
+  const [highlighted, setHighlighted] = useState(0);
+  // The action page: `page` is the session being acted on, `stashed` the
+  // result-list query it was drilled into from — backing out restores it, so
+  // the round trip costs the operator nothing.
+  const [page, setPage] = useState<Session | null>(null);
+  const [stashed, setStashed] = useState("");
+
+  // `~`'s candidates: the recents-and-projects list, fetched once, plus
+  // whatever `/api/dirs` has filled in for the directory being typed.
+  const [directories, setDirectories] = useState<DirectoryBarCandidate[]>([]);
+  const [probed, setProbed] = useState<DirectoryBarCandidate[]>([]);
+  const requestedRef = useRef(false);
+  const listingsRef = useRef(new Map<string, string[]>());
+
+  // On the action page the query line is over the three actions, so there is
+  // no sigil to read: `>` and `~` are ordinary characters there.
+  const parsed = useMemo(() => (page ? { sigil: null, query: raw } : parseBarQuery(raw)), [page, raw]);
+
+  const sessionCandidates = useMemo(
+    () => sessionBarCandidates(sessions, homeDir),
+    [sessions, homeDir],
+  );
+  const commandCandidates = useMemo(
+    () => commandBarCandidates(commands ?? publishedCommands()),
+    [commands],
+  );
+
+  // Closing returns the keyboard to whatever held it when the bar opened: a
+  // round trip through the bar never silently moves focus.
+  useEffect(() => {
+    const previouslyFocused = document.activeElement as HTMLElement | null;
+    inputRef.current?.focus();
+    return () => {
+      if (previouslyFocused?.isConnected) previouslyFocused.focus();
+    };
+  }, []);
+
+  // The recents-and-projects list, the first time `~` is used. No directories
+  // is a shorter list, not an error state.
+  useEffect(() => {
+    if (parsed.sigil !== "~" || requestedRef.current) return;
+    requestedRef.current = true;
+    let live = true;
+    loadDirectories()
+      .then((paths) => {
+        if (live) setDirectories(directoryBarCandidates(paths, homeDir));
+      })
+      .catch(() => {});
+    return () => {
+      live = false;
+    };
+  }, [parsed.sigil, loadDirectories, homeDir]);
+
+  // Fill the list in from `GET /api/dirs` once the query looks like a path: the
+  // directory it names is listed and its children join the candidates, so `~`
+  // reaches a directory that was never spawned in.
+  const dir = parsed.sigil === "~" ? probeDir(parsed.query) : "";
+  useEffect(() => {
+    if (dir === "") {
+      setProbed([]);
+      return;
+    }
+    const cached = listingsRef.current.get(dir);
+    if (cached) {
+      setProbed(directoryBarCandidates(dirEntryPaths(dir, cached), homeDir));
+      return;
+    }
+    let live = true;
+    setProbed([]);
+    listDirEntries(dir)
+      .then((entries) => {
+        listingsRef.current.set(dir, entries);
+        if (live) setProbed(directoryBarCandidates(dirEntryPaths(dir, entries), homeDir));
+      })
+      .catch(() => {
+        /* an unreadable directory contributes nothing */
+      });
+    return () => {
+      live = false;
+    };
+  }, [dir, listDirEntries, homeDir]);
+
+  /** What the matcher sees for the query line as it stands. With no sigil the
+   *  list is mixed — sessions and commands together — except on an empty query,
+   *  where the bar is a session switcher. */
+  const candidates: BarCandidate[] = useMemo(() => {
+    if (page) return sessionActionCandidates();
+    switch (parsed.sigil) {
+      case ">":
+        return [...commandCandidates];
+      case "~": {
+        const seen = new Set<string>();
+        return [...directories, ...probed].filter((c) =>
+          seen.has(c.path) ? false : (seen.add(c.path), true),
+        );
+      }
+      default:
+        return parsed.query === ""
+          ? [...sessionCandidates]
+          : [...sessionCandidates, ...commandCandidates];
+    }
+  }, [page, parsed.sigil, parsed.query, sessionCandidates, commandCandidates, directories, probed]);
+
+  const groups = useMemo(
+    () => barGroups(barRows(parsed.query, candidates)),
+    [parsed.query, candidates],
+  );
+  // Grouping is a rendering of the ranking, so the flattened groups are the
+  // rows in the order they appear — which is the order the highlight walks and
+  // Enter acts on.
+  const rows: BarResult[] = useMemo(() => groups.flatMap((g) => g.results), [groups]);
+
+  // The highlight starts on the globally best row every time the list changes:
+  // an old index would point at a different result.
+  useEffect(() => {
+    setHighlighted(0);
+  }, [rows]);
+
+  /** The highlight does not wrap: it stops at the first and last row. */
+  const move = useCallback(
+    (delta: number) => {
+      setHighlighted((at) => Math.min(rows.length - 1, Math.max(0, at + delta)));
+    },
+    [rows.length],
+  );
+
+  const runAction = useCallback(
+    (action: SessionAction, session: Session) => {
+      onClose();
+      switch (action.id) {
+        case "kill":
+          (props.onKillSession ?? ((s: Session) => raise(KILL_SESSION_EVENT, s)))(session);
+          return;
+        case "rename":
+          (props.onRenameSession ?? ((s: Session) => raise(RENAME_SESSION_EVENT, s)))(session);
+          return;
+        case "spawn-similar":
+          (props.onSpawnSimilar ?? ((s: Session) => raise(SPAWN_SIMILAR_EVENT, s)))(session);
+          return;
+      }
+    },
+    [onClose, props.onKillSession, props.onRenameSession, props.onSpawnSimilar],
+  );
+
+  const activate = useCallback(
+    (index: number) => {
+      const result = rows[index];
+      if (!result) return;
+      const candidate = result.candidate;
+      if (isActionCandidate(candidate)) {
+        // The page cannot be up without a session to act on.
+        if (page) runAction(candidate.action, page);
+        return;
+      }
+      onClose();
+      switch (candidate.kind) {
+        case "session":
+          (props.onOpenSession ?? ((id: string) => raise(SESSION_SELECT_EVENT, id)))(
+            candidate.session.id,
+          );
+          return;
+        case "command":
+          candidate.command.run();
+          return;
+        case "directory":
+          (props.onSpawnDirectory ?? ((p: string) => raise(SPAWN_DIRECTORY_EVENT, p)))(
+            candidate.path,
+          );
+          return;
+      }
+    },
+    [rows, page, runAction, onClose, props.onOpenSession, props.onSpawnDirectory],
+  );
+
+  /** `tab`: drill into the highlighted session's action page. No effect on any
+   *  other kind, and none on the page itself, which has no session rows. */
+  const drillIn = useCallback(() => {
+    const candidate = rows[highlighted]?.candidate;
+    if (page || candidate?.kind !== "session") return;
+    setPage(candidate.session);
+    setStashed(raw);
+    setRaw("");
+  }, [rows, highlighted, page, raw]);
+
+  /** Escape, or backspace at an empty query: back to the result list with the
+   *  query the drill-in was made from. */
+  const leavePage = useCallback(() => {
+    setPage(null);
+    setRaw(stashed);
+    setStashed("");
+  }, [stashed]);
+
+  const onKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    switch (e.key) {
+      case "Escape":
+        e.preventDefault();
+        // On an action page Escape is one level up, not the way out.
+        if (page) leavePage();
+        else onClose();
+        return;
+      case "Tab":
+        e.preventDefault();
+        drillIn();
+        return;
+      case "Backspace":
+        // Ordinary editing, except at an empty query on the action page.
+        if (page && raw === "") {
+          e.preventDefault();
+          leavePage();
+        }
+        return;
+      case "Enter":
+        e.preventDefault();
+        activate(highlighted);
+        return;
+      case "ArrowDown":
+        e.preventDefault();
+        move(1);
+        return;
+      case "ArrowUp":
+        e.preventDefault();
+        move(-1);
+        return;
+      case "n":
+        if (e.ctrlKey) {
+          e.preventDefault();
+          move(1);
+        }
+        return;
+      case "p":
+        if (e.ctrlKey) {
+          e.preventDefault();
+          move(-1);
+        }
+        return;
+    }
+  };
+
+  const activeRowId = rows.length > 0 ? `cmdbar-row-${highlighted}` : undefined;
+
+  return createPortal(
+    <div
+      className="cmdbar-overlay fixed inset-0 z-modal flex items-start justify-center bg-bg/70 pt-[12vh] backdrop-blur-sm max-[600px]:items-end max-[600px]:pt-0"
+      role="dialog"
+      aria-modal="true"
+      aria-label="Command bar"
+      onMouseDown={(e) => {
+        // A press on the scrim closes; one inside the panel is left alone.
+        if (!panelRef.current?.contains(e.target as Node)) onClose();
+      }}
+    >
+      <div
+        ref={panelRef}
+        className="cmdbar-panel flex w-full max-w-[560px] flex-col overflow-hidden rounded-r-3 border border-border bg-surface shadow-2 max-[600px]:max-w-none max-[600px]:rounded-b-none"
+      >
+        <input
+          ref={inputRef}
+          type="text"
+          role="combobox"
+          aria-expanded="true"
+          aria-controls="cmdbar-results"
+          aria-label="Search sessions, commands and directories"
+          aria-activedescendant={activeRowId}
+          autoComplete="off"
+          spellCheck={false}
+          className="cmdbar-input w-full border-b border-border bg-transparent px-sp-3 py-sp-2 text-fs-15 text-ink outline-none"
+          placeholder={page ? `Act on ${sessionName(page)}…` : PLACEHOLDERS[parsed.sigil ?? "mixed"]}
+          value={raw}
+          onChange={(e) => setRaw(e.currentTarget.value)}
+          onKeyDown={onKeyDown}
+        />
+        {page ? (
+          <ActionPage
+            session={page}
+            groups={groups}
+            highlighted={highlighted}
+            onActivate={activate}
+          />
+        ) : (
+          <ResultList
+            groups={groups}
+            // While a sigil is in force there is one kind, so the header is
+            // dropped.
+            showHeaders={parsed.sigil === null}
+            highlighted={highlighted}
+            onActivate={activate}
+          />
+        )}
+      </div>
+    </div>,
+    document.body,
+  );
+}

web/src/components/commandBar/ResultList.tsx

@@ -0,0 +1,171 @@
+// The bar's result list: kind headers over rank-ordered rows
+// (docs/COMMAND-BAR.md, "Structure"). Headers are labels, never rows — the
+// highlight walks the rows alone, in the order they are rendered.
+
+import { useEffect, useRef } from "react";
+
+import { keyCaps } from "../../commands.js";
+import {
+  highlightSegments,
+  isActionCandidate,
+  metaText,
+  rowName,
+  type BarGroup,
+  type BarResult,
+} from "./model.js";
+
+export interface ResultListProps {
+  groups: BarGroup[];
+  /** Dropped while a sigil is in force or on the action page: one kind needs
+   * no header. */
+  showHeaders: boolean;
+  /** Index into the flattened rows, in the order they render. */
+  highlighted: number;
+  onActivate(index: number): void;
+}
+
+function Highlighted({ text, ranges }: { text: string; ranges: BarResult["ranges"] }) {
+  return (
+    <>
+      {highlightSegments(text, ranges).map((segment, i) =>
+        segment.hit ? (
+          <mark key={i} className="cmdbar-hit bg-transparent font-semibold text-accent">
+            {segment.text}
+          </mark>
+        ) : (
+          <span key={i}>{segment.text}</span>
+        ),
+      )}
+    </>
+  );
+}
+
+function Row({
+  result,
+  index,
+  active,
+  onActivate,
+}: {
+  result: BarResult;
+  index: number;
+  active: boolean;
+  onActivate(index: number): void;
+}) {
+  const ref = useRef<HTMLDivElement>(null);
+  const candidate = result.candidate;
+
+  useEffect(() => {
+    if (active) ref.current?.scrollIntoView({ block: "nearest" });
+  }, [active]);
+
+  const name = rowName(candidate);
+  const nameMatched =
+    result.field === "name" || result.field === "label" || result.field === "path";
+  const meta = metaText(result);
+  const dead = candidate.kind === "session" && candidate.session.status === "Dead";
+  const chord =
+    candidate.kind === "command" && !isActionCandidate(candidate)
+      ? candidate.command.keys[0]
+      : undefined;
+
+  return (
+    <div
+      ref={ref}
+      role="option"
+      id={`cmdbar-row-${index}`}
+      aria-selected={active}
+      data-index={index}
+      data-kind={candidate.kind}
+      data-session-id={candidate.kind === "session" ? candidate.session.id : undefined}
+      data-action-id={isActionCandidate(candidate) ? candidate.action.id : undefined}
+      data-command-id={
+        candidate.kind === "command" && !isActionCandidate(candidate)
+          ? candidate.command.id
+          : undefined
+      }
+      data-path={candidate.kind === "directory" ? candidate.path : undefined}
+      className={[
+        "cmdbar-row flex cursor-pointer items-baseline gap-sp-2 rounded-r-1 px-sp-3 py-sp-1 text-fs-13",
+        active ? "is-active bg-surface-2 text-ink" : "text-ink",
+        dead ? "is-dead opacity-60" : "",
+      ]
+        .filter(Boolean)
+        .join(" ")}
+      onClick={() => onActivate(index)}
+    >
+      <span className="cmdbar-row-name truncate">
+        {nameMatched ? <Highlighted text={name} ranges={result.ranges} /> : name}
+      </span>
+      {chord !== undefined ? (
+        <span className="cmdbar-row-keys ml-auto flex gap-1">
+          {keyCaps(chord).map((cap, i) => (
+            <kbd
+              key={i}
+              className="rounded-r-1 border border-border px-1 text-fs-11 text-muted"
+            >
+              {cap}
+            </kbd>
+          ))}
+        </span>
+      ) : meta ? (
+        <span className="cmdbar-row-meta ml-auto truncate text-fs-11 text-muted">
+          {result.field !== undefined && result.field !== "name" ? (
+            <Highlighted text={meta} ranges={result.ranges} />
+          ) : (
+            meta
+          )}
+        </span>
+      ) : null}
+    </div>
+  );
+}
+
+export function ResultList({ groups, showHeaders, highlighted, onActivate }: ResultListProps) {
+  if (groups.length === 0) {
+    return (
+      <div
+        id="cmdbar-results"
+        role="listbox"
+        aria-label="Results"
+        className="cmdbar-results max-h-[50vh] overflow-auto p-sp-1"
+      >
+        <div className="cmdbar-empty px-sp-3 py-sp-2 text-fs-12 text-muted">No matches</div>
+      </div>
+    );
+  }
+
+  let index = 0;
+  return (
+    <div
+      id="cmdbar-results"
+      role="listbox"
+      aria-label="Results"
+      className="cmdbar-results max-h-[50vh] overflow-auto p-sp-1"
+    >
+      {groups.map((group) => (
+        <div key={group.kind}>
+          {showHeaders ? (
+            <div
+              role="presentation"
+              className="cmdbar-group-title px-sp-3 pt-sp-2 pb-1 text-fs-11 uppercase tracking-wide text-muted"
+            >
+              {group.title}
+            </div>
+          ) : null}
+          {group.results.map((result) => {
+            const at = index++;
+            return (
+              <Row
+                key={at}
+                result={result}
+                index={at}
+                active={at === highlighted}
+                onActivate={onActivate}
+              />
+            );
+          })}
+        </div>
+      ))}
+    </div>
+  );
+}

web/src/components/commandBar/index.ts

@@ -0,0 +1,5 @@
+export { CommandBar, SPAWN_DIRECTORY_EVENT, type CommandBarProps } from "./CommandBar.js";
+export { ResultList, type ResultListProps } from "./ResultList.js";
+export { ActionPage, type ActionPageProps } from "./ActionPage.js";
+export { useCommandBar, type CommandBarControls, type UseCommandBarOptions } from "./useCommandBar.js";
+export * from "./model.js";

web/src/components/commandBar/model.test.ts

@@ -0,0 +1,197 @@
+import { describe, expect, it } from "vitest";
+
+import type { Command } from "../../commands.js";
+import type { Session } from "../../types.js";
+import {
+  barGroups,
+  barRows,
+  commandBarCandidates,
+  dedupeCommands,
+  directoryBarCandidates,
+  directoryCandidate,
+  highlightSegments,
+  orderSessionsForBar,
+  parseBarQuery,
+  sessionActionCandidates,
+  sessionBarCandidates,
+  sessionCandidate,
+} from "./model.js";
+
+function session(id: string, over: Partial<Session> = {}): Session {
+  return {
+    id,
+    cwd: "/home/me/dev/api",
+    command: "bash",
+    env: {},
+    metadata: { name: id },
+    status: "Running",
+    created_at: "2026-01-01T00:00:00Z",
+    ...over,
+  };
+}
+
+function command(over: Partial<Command> = {}): Command {
+  return {
+    id: "a",
+    label: "A command",
+    group: "Test",
+    keys: ["a"],
+    scope: "global",
+    run: () => {},
+    ...over,
+  };
+}
+
+describe("empty-query ordering", () => {
+  it("sorts most recently focused first", () => {
+    const older = session("older", { last_focused_at: "2026-01-01T10:00:00Z" });
+    const newer = session("newer", { last_focused_at: "2026-01-01T11:00:00Z" });
+    expect(orderSessionsForBar([older, newer]).map((s) => s.id)).toEqual(["newer", "older"]);
+  });
+
+  it("sorts a never-focused session after every focused one, newest created first", () => {
+    const focused = session("focused", { last_focused_at: "2026-01-01T09:00:00Z" });
+    const old = session("old", { created_at: "2026-01-01T00:00:00Z" });
+    const fresh = session("fresh", { created_at: "2026-01-02T00:00:00Z" });
+    expect(orderSessionsForBar([old, fresh, focused]).map((s) => s.id)).toEqual([
+      "focused",
+      "fresh",
+      "old",
+    ]);
+  });
+
+  it("sorts dead sessions after live ones regardless of recency", () => {
+    const dead = session("dead", { status: "Dead", last_focused_at: "2026-01-01T12:00:00Z" });
+    const live = session("live", { last_focused_at: "2026-01-01T10:00:00Z" });
+    expect(orderSessionsForBar([dead, live]).map((s) => s.id)).toEqual(["live", "dead"]);
+  });
+
+  it("treats an empty last_focused_at as never focused", () => {
+    const blank = session("blank", { last_focused_at: "" });
+    const focused = session("focused", { last_focused_at: "2026-01-01T10:00:00Z" });
+    expect(orderSessionsForBar([blank, focused]).map((s) => s.id)).toEqual(["focused", "blank"]);
+  });
+});
+
+describe("session candidates", () => {
+  it("carries the candidate table's fields, with the directory abbreviated", () => {
+    const s = session("api", {
+      metadata: { name: "api" },
+      current_cwd: "/home/me/dev/api",
+      command: "claude --resume",
+    });
+    expect(sessionCandidate(s, "/home/me").fields).toEqual({
+      name: "api",
+      directory: "~/dev/api",
+      command: "claude --resume",
+      tool: "claude",
+    });
+  });
+
+  it("leaves the tool out when the program has no mark, and groups a worktree by its repo", () => {
+    const s = session("edit", {
+      metadata: {},
+      command: "hx src/",
+      worktree: { path: "/home/me/dev/api/wt/x", base_repo: "/home/me/dev/api" },
+    });
+    const candidate = sessionCandidate(s, "/home/me");
+    expect(candidate.fields.tool).toBeUndefined();
+    expect(candidate.fields.directory).toBe("~/dev/api");
+    // No `metadata.name`: the sidebar's fallback is the command line.
+    expect(candidate.fields.name).toBe("hx src/");
+  });
+
+  it("builds candidates in the empty-query order", () => {
+    const a = session("a", { last_focused_at: "2026-01-01T10:00:00Z" });
+    const b = session("b", { last_focused_at: "2026-01-01T11:00:00Z" });
+    expect(sessionBarCandidates([a, b]).map((c) => c.session.id)).toEqual(["b", "a"]);
+  });
+});
+
+describe("rows and grouping", () => {
+  it("an empty query keeps every candidate in input order", () => {
+    const candidates = sessionBarCandidates([session("a"), session("b")]);
+    expect(barRows("", candidates).map((r) => r.score)).toEqual([0, 0]);
+  });
+
+  it("groups by kind without reordering the ranking", () => {
+    const rows = barRows("kill", [
+      ...sessionBarCandidates([session("killer-app", { metadata: { name: "killer-app" } })]),
+      ...commandBarCandidates([command({ label: "Kill selected session" })]),
+    ]);
+    const groups = barGroups(rows);
+    expect(groups.map((g) => g.title)).toEqual(["Sessions", "Commands"]);
+    expect(groups.flatMap((g) => g.results)).toEqual(rows);
+  });
+});
+
+describe("parsing the query line", () => {
+  it("reads a sigil only in first position", () => {
+    expect(parseBarQuery(">help")).toEqual({ sigil: ">", query: "help" });
+    expect(parseBarQuery("~dev")).toEqual({ sigil: "~", query: "dev" });
+  });
+
+  it("leaves a sigil character elsewhere in the query literal", () => {
+    expect(parseBarQuery("~dev/~scratch")).toEqual({ sigil: "~", query: "dev/~scratch" });
+    expect(parseBarQuery("a>b")).toEqual({ sigil: null, query: "a>b" });
+  });
+
+  it("returns to the mixed list when the sigil is backspaced away", () => {
+    expect(parseBarQuery("")).toEqual({ sigil: null, query: "" });
+  });
+});
+
+describe("command candidates", () => {
+  it("dedupes by action, not by chord", () => {
+    const run = () => {};
+    const cmds = [
+      command({ id: "one", label: "Do it", keys: ["j"], run }),
+      command({ id: "two", label: "Do it", keys: ["down"], run }),
+    ];
+    expect(commandBarCandidates(cmds)).toHaveLength(1);
+    expect(dedupeCommands(cmds)).toHaveLength(1);
+  });
+
+  it("matches on the label only, never on the chord", () => {
+    const candidates = commandBarCandidates([command({ label: "Show help", keys: ["ctrl-q"] })]);
+    expect(barRows("ctrlq", candidates)).toEqual([]);
+    expect(barRows("show", candidates)).toHaveLength(1);
+  });
+});
+
+describe("directory candidates", () => {
+  it("abbreviates the path it shows and keeps the one it spawns in", () => {
+    const candidate = directoryCandidate("/home/me/dev/api", "/home/me");
+    expect(candidate.fields.path).toBe("~/dev/api");
+    expect(candidate.path).toBe("/home/me/dev/api");
+  });
+
+  it("expands a typed `~` and dedupes by the directory spawned in", () => {
+    const candidates = directoryBarCandidates(
+      ["~/dev/api", "/home/me/dev/api", "", "/srv/x"],
+      "/home/me",
+    );
+    expect(candidates.map((c) => c.path)).toEqual(["/home/me/dev/api", "/srv/x"]);
+  });
+});
+
+describe("the action page's candidates", () => {
+  it("offers no action beyond the three", () => {
+    expect(sessionActionCandidates().map((c) => c.action.id)).toEqual([
+      "kill",
+      "rename",
+      "spawn-similar",
+    ]);
+  });
+});
+
+describe("highlight segments", () => {
+  it("splits the text on the matcher's ranges", () => {
+    expect(highlightSegments("web-search", [[0, 1], [4, 5]])).toEqual([
+      { text: "w", hit: true },
+      { text: "eb-", hit: false },
+      { text: "s", hit: true },
+      { text: "earch", hit: false },
+    ]);
+  });
+});

web/src/components/commandBar/model.ts

@@ -0,0 +1,366 @@
+// The command bar's pure model (docs/COMMAND-BAR.md), lifted from
+// ../../commandBar.ts for the React port (#247): what a candidate is, the
+// order an empty query lists them in, how a query line splits into a sigil and
+// a query, and how a ranked list groups for rendering.
+//
+// Nothing here touches the DOM or the network apart from `loadBarDirectories`,
+// which is the one place the `~` list comes from.
+
+import { listDir, projects as fetchProjects, recentDirs } from "../../api.js";
+import type { Command } from "../../commands.js";
+import { splitPath } from "../../paths.js";
+import { splitCommand } from "../../toolIcon.js";
+import { abbreviateCwd, sessionName, sessionTreePath, type Session } from "../../types.js";
+import {
+  matchAndRank,
+  type CandidateKind,
+  type CommandCandidate,
+  type DirectoryCandidate,
+  type MatchRange,
+  type MatchResult,
+  type SessionCandidate,
+} from "../../utils/matcher.js";
+
+/** A matcher candidate that remembers what it came from, so a result can be
+ *  acted on without a second lookup. The extra property is invisible to the
+ *  matcher, which only ever reads `kind` and `fields`. */
+export type SessionBarCandidate = SessionCandidate & { session: Session };
+export type CommandBarCandidate = CommandCandidate & { command: Command };
+/** `fields.path` is the abbreviated path the operator reads and the matcher
+ *  ranks; `path` is the one a spawn is made in. */
+export type DirectoryBarCandidate = DirectoryCandidate & { path: string };
+
+/** One row of a session's action page. It is a `command` to the matcher — a
+ *  single `label` field, ranked exactly like a registry command — and carries
+ *  the action it stands for instead of a registry entry. */
+export type ActionBarCandidate = CommandCandidate & { action: SessionAction };
+
+export type BarCandidate =
+  | SessionBarCandidate
+  | CommandBarCandidate
+  | ActionBarCandidate
+  | DirectoryBarCandidate;
+export type BarResult = MatchResult<BarCandidate>;
+
+/** One kind's slice of the ranked list, in rank order. */
+export interface BarGroup<C extends BarCandidate = BarCandidate> {
+  kind: CandidateKind;
+  title: string;
+  results: MatchResult<C>[];
+}
+
+const KIND_TITLES: Record<CandidateKind, string> = {
+  session: "Sessions",
+  command: "Commands",
+  directory: "Directories",
+};
+
+// ---- the sigils ----
+
+export type BarSigil = ">" | "~";
+
+export interface BarQuery {
+  /** The sigil in force, or null for the mixed list. */
+  sigil: BarSigil | null;
+  /** What the matcher sees: everything after a sigil, or the whole query. */
+  query: string;
+}
+
+export const PLACEHOLDERS: Record<"mixed" | BarSigil, string> = {
+  mixed: "Go to a session…",
+  ">": "Run a command…",
+  "~": "Spawn in a directory…",
+};
+
+/** Split a raw query line into its sigil and the query proper.
+ *
+ *  A sigil is only a sigil in first position: `>` or `~` anywhere else is a
+ *  literal query character, which is what a directory query with a second `~`
+ *  in it depends on. Backspacing past a sigil needs no special case either —
+ *  the first character goes and the query is a mixed one again. */
+export function parseBarQuery(raw: string): BarQuery {
+  const first = raw[0];
+  if (first === ">" || first === "~") return { sigil: first, query: raw.slice(1) };
+  return { sigil: null, query: raw };
+}
+
+// ---- the session action page ----
+
+/** The actions a session's action page offers, and no others: the bar picks
+ *  one and hands off to the flow that already implements it
+ *  (docs/COMMAND-BAR.md, "Drill-in"). */
+export type SessionActionId = "kill" | "rename" | "spawn-similar";
+
+export interface SessionAction {
+  id: SessionActionId;
+  label: string;
+}
+
+export const SESSION_ACTIONS: readonly SessionAction[] = [
+  { id: "kill", label: "Kill session" },
+  { id: "rename", label: "Rename session" },
+  { id: "spawn-similar", label: "Spawn similar" },
+];
+
+/** The action page's candidates, in the order above — which is the order an
+ *  empty query lists them in, since the matcher keeps input order. */
+export function sessionActionCandidates(): ActionBarCandidate[] {
+  return SESSION_ACTIONS.map((action) => ({
+    kind: "command",
+    action,
+    fields: { label: action.label },
+  }));
+}
+
+/** Narrow a `command` candidate to an action row. Both share the matcher's
+ *  `command` kind, so what separates them is what they carry. */
+export function isActionCandidate(candidate: BarCandidate): candidate is ActionBarCandidate {
+  return candidate.kind === "command" && "action" in candidate;
+}
+
+// ---- candidates ----
+
+function focusedAt(s: Session): number | null {
+  const stamp = s.last_focused_at;
+  if (typeof stamp !== "string" || stamp === "") return null;
+  const ms = Date.parse(stamp);
+  return Number.isNaN(ms) ? null : ms;
+}
+
+function createdAt(s: Session): number {
+  const ms = Date.parse(s.created_at ?? "");
+  return Number.isNaN(ms) ? 0 : ms;
+}
+
+/** The empty-query order (docs/COMMAND-BAR.md, "Empty query"): most recently
+ *  focused first; a session that has never been focused sorts after every
+ *  session that has, most recently created first among those; and a dead
+ *  session sorts after every live one regardless of recency, because a session
+ *  you cannot attach to is not where you just were.
+ *
+ *  This is also the input order for a non-empty query, which is what the
+ *  matcher's last tie-break preserves. */
+export function orderSessionsForBar(sessions: readonly Session[]): Session[] {
+  return [...sessions].sort((a, b) => {
+    const deadA = a.status === "Dead" ? 1 : 0;
+    const deadB = b.status === "Dead" ? 1 : 0;
+    if (deadA !== deadB) return deadA - deadB;
+
+    const focusA = focusedAt(a);
+    const focusB = focusedAt(b);
+    if ((focusA === null) !== (focusB === null)) return focusA === null ? 1 : -1;
+    if (focusA !== null && focusB !== null && focusA !== focusB) return focusB - focusA;
+
+    return createdAt(b) - createdAt(a);
+  });
+}
+
+/** Build one session's candidate: the fields docs/COMMAND-BAR.md's candidate
+ *  table names, with the directory abbreviated the way the sidebar shows it. */
+export function sessionCandidate(s: Session, homeDir?: string): SessionBarCandidate {
+  const treePath = sessionTreePath(s);
+  const directory = treePath ? abbreviateCwd(treePath, homeDir) : undefined;
+  const tool = splitCommand(s.command).tool ?? undefined;
+  return {
+    kind: "session",
+    session: s,
+    fields: {
+      name: sessionName(s),
+      ...(directory ? { directory } : {}),
+      ...(s.command ? { command: s.command } : {}),
+      ...(tool ? { tool } : {}),
+    },
+  };
+}
+
+/** Every session as a candidate, in the empty-query order. */
+export function sessionBarCandidates(
+  sessions: readonly Session[],
+  homeDir?: string,
+): SessionBarCandidate[] {
+  return orderSessionsForBar(sessions).map((s) => sessionCandidate(s, homeDir));
+}
+
+/** Drop the commands that would list twice. Several chords can be bound to one
+ *  action — the registry already carries its aliases on one entry, but nothing
+ *  stops two entries running the same handler, and listed naively that is two
+ *  identical rows. The dedupe is by **action**, never by chord: the chord is
+ *  displayed, so a command with two of them is still one row. */
+export function dedupeCommands(commands: readonly Command[]): Command[] {
+  const seenRun = new Set<Command["run"]>();
+  const seenLabel = new Set<string>();
+  const kept: Command[] = [];
+  for (const command of commands) {
+    if (seenRun.has(command.run) || seenLabel.has(command.label)) continue;
+    seenRun.add(command.run);
+    seenLabel.add(command.label);
+    kept.push(command);
+  }
+  return kept;
+}
+
+/** Every bound command as a candidate, in registry order. Only the label is a
+ *  field: the chord is displayed beside the row, never matched, because
+ *  matching it would make `>` results depend on a user's rebinds. */
+export function commandBarCandidates(commands: readonly Command[]): CommandBarCandidate[] {
+  return dedupeCommands(commands).map((command) => ({
+    kind: "command",
+    command,
+    fields: { label: command.label },
+  }));
+}
+
+/** `~/dev/api` back to `/home/me/dev/api` — the inverse of `abbreviateCwd`, for
+ *  a path the operator typed or `/api/dirs` completed. */
+export function expandHome(path: string, homeDir?: string): string {
+  if (!homeDir) return path;
+  if (path === "~") return homeDir;
+  return path.startsWith("~/") ? `${homeDir}${path.slice(1)}` : path;
+}
+
+export function directoryCandidate(path: string, homeDir?: string): DirectoryBarCandidate {
+  const absolute = expandHome(path, homeDir);
+  return { kind: "directory", path: absolute, fields: { path: abbreviateCwd(absolute, homeDir) } };
+}
+
+/** Candidates for `~`, deduped by the directory they spawn in and keeping the
+ *  first mention of each — recent dirs (newest first) ahead of the project
+ *  list, which is the empty-query order the contract asks for. */
+export function directoryBarCandidates(
+  paths: readonly string[],
+  homeDir?: string,
+): DirectoryBarCandidate[] {
+  const seen = new Set<string>();
+  const out: DirectoryBarCandidate[] = [];
+  for (const path of paths) {
+    if (path === "") continue;
+    const candidate = directoryCandidate(path, homeDir);
+    if (seen.has(candidate.path)) continue;
+    seen.add(candidate.path);
+    out.push(candidate);
+  }
+  return out;
+}
+
+/** The directory list the bar starts from: what the spawn form already knows —
+ *  `GET /api/recent-dirs` and the project list — either alone if the other
+ *  fails. */
+export async function loadBarDirectories(): Promise<string[]> {
+  const [recents, discovered] = await Promise.all([
+    recentDirs()
+      .then((r) => r.dirs.map((d) => d.cwd))
+      .catch(() => [] as string[]),
+    fetchProjects()
+      .then((list) => list.map((p) => p.path))
+      .catch(() => [] as string[]),
+  ]);
+  return [...recents, ...discovered];
+}
+
+/** One directory's children as candidate paths, for filling the `~` list in as
+ *  a path is typed. The directory being listed comes from the query itself. */
+export function dirEntryPaths(dir: string, entries: readonly string[]): string[] {
+  return entries.map((entry) => `${dir}${entry}`);
+}
+
+/** The directory a `~` query names, or `""` when it names none yet. */
+export function probeDir(query: string): string {
+  return splitPath(query).dir;
+}
+
+/** `GET /api/dirs`, in the shape the bar wants it. */
+export function listDirEntries(dir: string): Promise<string[]> {
+  return listDir(dir).then((listing) => listing.entries);
+}
+
+// ---- grouping ----
+
+/** Bucket a ranked list by kind for rendering. Grouping is a rendering of the
+ *  ranking, never a reordering of it: a group holds its matches in rank order,
+ *  and groups appear in the order their best-scoring member does — so the first
+ *  row under the first header is the globally best result. */
+export function barGroups<C extends BarCandidate>(
+  results: readonly MatchResult<C>[],
+): BarGroup<C>[] {
+  const groups: BarGroup<C>[] = [];
+  for (const result of results) {
+    const kind = result.candidate.kind;
+    let group = groups.find((g) => g.kind === kind);
+    if (!group) {
+      group = { kind, title: KIND_TITLES[kind], results: [] };
+      groups.push(group);
+    }
+    group.results.push(result);
+  }
+  return groups;
+}
+
+/** The rows a query produces, flat and in rank order — what the highlight walks
+ *  and what Enter acts on. Headers are labels, not rows, so they are never in
+ *  this list. */
+export function barRows<C extends BarCandidate>(
+  query: string,
+  candidates: readonly C[],
+): MatchResult<C>[] {
+  return matchAndRank(query, candidates);
+}
+
+// ---- row text ----
+
+/** The name line of a row: the session's name, the command's label, or the
+ *  directory's path. */
+export function rowName(candidate: BarCandidate): string {
+  switch (candidate.kind) {
+    case "session":
+      return candidate.fields.name;
+    case "command":
+      return candidate.fields.label;
+    case "directory":
+      return candidate.fields.path;
+  }
+}
+
+/** The secondary line under a session row: the field the match was found in
+ *  when that was not the name, so a session found through its directory says
+ *  so. Only sessions have one — a command shows keycaps instead, and a
+ *  directory's path is already the name. */
+export function metaText(result: BarResult): string | undefined {
+  if (result.candidate.kind !== "session") return undefined;
+  const fields = result.candidate.fields;
+  switch (result.field) {
+    case "directory":
+      return fields.directory;
+    case "command":
+      return fields.command;
+    case "tool":
+      return fields.tool;
+    default:
+      return fields.directory;
+  }
+}
+
+/** One run of a row's text, flagged when the matcher matched inside it. The
+ *  React rendering of `renderHighlighted`: ranges come from the matcher as
+ *  `[start, end)` character pairs over the field that won. */
+export interface HighlightSegment {
+  text: string;
+  hit: boolean;
+}
+
+export function highlightSegments(
+  text: string,
+  ranges: readonly MatchRange[],
+): HighlightSegment[] {
+  const out: HighlightSegment[] = [];
+  let cursor = 0;
+  for (const [start, end] of ranges) {
+    if (start > cursor) out.push({ text: text.slice(cursor, start), hit: false });
+    out.push({ text: text.slice(start, end), hit: true });
+    cursor = end;
+  }
+  if (cursor < text.length) out.push({ text: text.slice(cursor), hit: false });
+  return out;
+}
+
+export { sessionName };
+export type { CandidateKind, MatchRange, MatchResult };

web/src/components/commandBar/useCommandBar.test.tsx

@@ -0,0 +1,76 @@
+// @vitest-environment happy-dom
+import { act, cleanup, render } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { OPEN_COMMAND_BAR_EVENT } from "../../uiEvents.js";
+import { useCommandBar, type UseCommandBarOptions } from "./useCommandBar.js";
+
+let controls: ReturnType<typeof useCommandBar>;
+
+function Probe(opts: UseCommandBarOptions) {
+  controls = useCommandBar(opts);
+  return <div>{controls.open ? "open" : "closed"}</div>;
+}
+
+function ctrlK(target: EventTarget = window): void {
+  act(() => {
+    target.dispatchEvent(
+      new KeyboardEvent("keydown", { key: "k", ctrlKey: true, bubbles: true, cancelable: true }),
+    );
+  });
+}
+
+afterEach(cleanup);
+
+describe("useCommandBar", () => {
+  it("opens on ctrl-k, from the capture phase so an attached xterm never sees it", () => {
+    const view = render(<Probe />);
+    ctrlK();
+    expect(view.container.textContent).toBe("open");
+  });
+
+  it("stays deaf while the bar is already up — its own input owns the keys", () => {
+    const onOpen = vi.fn();
+    render(<Probe onOpen={onOpen} />);
+    ctrlK();
+    ctrlK();
+    expect(onOpen).toHaveBeenCalledTimes(1);
+  });
+
+  it("leaves a form field's own Ctrl-K alone", () => {
+    const field = document.createElement("input");
+    document.body.appendChild(field);
+    const view = render(<Probe />);
+    ctrlK(field);
+    expect(view.container.textContent).toBe("closed");
+    field.remove();
+  });
+
+  it("opens from the sidebar's search field, the touch entry point", () => {
+    const view = render(<Probe />);
+    act(() => {
+      document.dispatchEvent(new CustomEvent(OPEN_COMMAND_BAR_EVENT));
+    });
+    expect(view.container.textContent).toBe("open");
+  });
+
+  it("runs the caller's hook before opening, so a preview is discarded first", () => {
+    const onOpen = vi.fn();
+    render(<Probe onOpen={onOpen} />);
+    ctrlK();
+    expect(onOpen).toHaveBeenCalledTimes(1);
+  });
+
+  it("closes on demand", () => {
+    const view = render(<Probe />);
+    ctrlK();
+    act(() => controls.closeBar());
+    expect(view.container.textContent).toBe("closed");
+  });
+
+  it("binds nothing while disabled — another overlay owns the keyboard", () => {
+    const view = render(<Probe enabled={false} />);
+    ctrlK();
+    expect(view.container.textContent).toBe("closed");
+  });
+});

web/src/components/commandBar/useCommandBar.ts

@@ -0,0 +1,65 @@
+// Opening and closing the bar (docs/COMMAND-BAR.md, "Opening"). `ctrl-k` is a
+// registry command like any other, so the `?` overlay lists it without a
+// second list; the touch entry point — the sidebar's search field — raises
+// `OPEN_COMMAND_BAR_EVENT` and lands on the same open.
+
+import { useCallback, useEffect, useState } from "react";
+
+import { OPEN_COMMAND_BAR_EVENT } from "../../uiEvents.js";
+import { CommandSet, defineCommands, isBarTypingTarget } from "../../commands.js";
+
+export interface UseCommandBarOptions {
+  /** Run before the bar opens — the shell discards a preview here, since the
+   * bar is not previewed into (docs/PREVIEW.md). */
+  onOpen?(): void;
+  /** Off while another overlay owns the keyboard (the restart overlay, the
+   * help dialog). Defaults to on. */
+  enabled?: boolean;
+}
+
+export interface CommandBarControls {
+  open: boolean;
+  openBar(): void;
+  closeBar(): void;
+}
+
+export function useCommandBar(opts: UseCommandBarOptions = {}): CommandBarControls {
+  const { onOpen, enabled = true } = opts;
+  const [open, setOpen] = useState(false);
+
+  const openBar = useCallback(() => {
+    onOpen?.();
+    setOpen(true);
+  }, [onOpen]);
+
+  const closeBar = useCallback(() => setOpen(false), []);
+
+  useEffect(() => {
+    if (!enabled) return;
+    const keys = new CommandSet(defineCommands({ "bar.open": openBar }));
+
+    // Capture phase: an attached xterm swallows every keystroke it is given, so
+    // the bar's binding has to be seen ahead of the terminal.
+    const onKeydown = (e: KeyboardEvent) => {
+      // The bar owns the keyboard while it is up; its own input handles the keys.
+      if (open) return;
+      // The pane's hidden textarea is not a typing target for the bar: ctrl-k
+      // is seen ahead of xterm and opens the bar. A real form field — the spawn
+      // form's inputs — keeps its own Ctrl+K.
+      if (isBarTypingTarget(e.target)) return;
+      keys.handle(e);
+    };
+    const onTouchEntry = () => {
+      if (!open) openBar();
+    };
+
+    window.addEventListener("keydown", onKeydown, true);
+    document.addEventListener(OPEN_COMMAND_BAR_EVENT, onTouchEntry);
+    return () => {
+      window.removeEventListener("keydown", onKeydown, true);
+      document.removeEventListener(OPEN_COMMAND_BAR_EVENT, onTouchEntry);
+    };
+  }, [enabled, open, openBar]);
+
+  return { open, openBar, closeBar };
+}

web/src/components/common/ContextMenu.test.tsx

@@ -0,0 +1,68 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { ContextMenu } from "./ContextMenu.js";
+
+afterEach(() => {
+  cleanup();
+});
+
+function labels(): string[] {
+  return [...document.querySelectorAll(".context-menu-item")].map((b) => b.textContent ?? "");
+}
+
+describe("ContextMenu (#125)", () => {
+  it("renders one item per entry, in order", () => {
+    render(
+      <ContextMenu
+        x={10}
+        y={20}
+        items={[
+          { label: "Rename…", onSelect: () => {} },
+          { label: "Kill session", onSelect: () => {}, danger: true },
+        ]}
+        onClose={vi.fn()}
+      />,
+    );
+    expect(labels()).toEqual(["Rename…", "Kill session"]);
+    expect(document.querySelector(".context-menu-item.is-danger")?.textContent).toBe("Kill session");
+  });
+
+  it("runs the selected entry and closes", () => {
+    const chosen = vi.fn();
+    const onClose = vi.fn();
+    render(<ContextMenu x={0} y={0} items={[{ label: "Rename…", onSelect: chosen }]} onClose={onClose} />);
+    fireEvent.click(screen.getByRole("menuitem"));
+    expect(chosen).toHaveBeenCalledOnce();
+    expect(onClose).toHaveBeenCalledOnce();
+  });
+
+  it("closes on Escape and on a press outside it", () => {
+    const onClose = vi.fn();
+    render(<ContextMenu x={0} y={0} items={[{ label: "Rename…", onSelect: () => {} }]} onClose={onClose} />);
+    fireEvent.keyDown(document, { key: "Escape" });
+    expect(onClose).toHaveBeenCalledTimes(1);
+
+    fireEvent(document.body, new Event("pointerdown", { bubbles: true }));
+    expect(onClose).toHaveBeenCalledTimes(2);
+  });
+
+  it("stays open for a press inside itself", () => {
+    const onClose = vi.fn();
+    render(<ContextMenu x={0} y={0} items={[{ label: "Rename…", onSelect: () => {} }]} onClose={onClose} />);
+    const menu = document.querySelector(".context-menu") as HTMLElement;
+    fireEvent(menu, new Event("pointerdown", { bubbles: true }));
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("closes on scroll and on resize", () => {
+    const onClose = vi.fn();
+    render(<ContextMenu x={0} y={0} items={[{ label: "Rename…", onSelect: () => {} }]} onClose={onClose} />);
+    fireEvent.scroll(window);
+    expect(onClose).toHaveBeenCalledTimes(1);
+
+    fireEvent.resize(window);
+    expect(onClose).toHaveBeenCalledTimes(2);
+  });
+});

web/src/components/common/ContextMenu.tsx

@@ -0,0 +1,86 @@
+// React port of ../../contextMenu.ts (#125), the general-purpose version —
+// unlike the sidebar's own menu, this one also closes on scroll/resize, since
+// a menu anchored to coordinates goes stale the moment the page moves under it.
+
+import { useEffect, useLayoutEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
+
+export interface ContextMenuItem {
+  label: string;
+  onSelect(): void;
+  /** Renders the entry in the destructive style. */
+  danger?: boolean;
+}
+
+export interface ContextMenuProps {
+  x: number;
+  y: number;
+  items: ContextMenuItem[];
+  onClose(): void;
+}
+
+export function ContextMenu({ x, y, items, onClose }: ContextMenuProps) {
+  const ref = useRef<HTMLDivElement>(null);
+  const [pos, setPos] = useState({ left: x, top: y });
+
+  // Nudge back inside the viewport once the menu has a measurable size.
+  useLayoutEffect(() => {
+    const rect = ref.current?.getBoundingClientRect();
+    if (!rect) return;
+    const maxX = window.innerWidth - rect.width;
+    const maxY = window.innerHeight - rect.height;
+    setPos({ left: Math.max(0, Math.min(x, maxX)), top: Math.max(0, Math.min(y, maxY)) });
+  }, [x, y]);
+
+  useEffect(() => {
+    const onKeyDown = (e: KeyboardEvent) => {
+      if (e.key === "Escape") onClose();
+    };
+    const onPointerDown = (e: Event) => {
+      if (!ref.current?.contains(e.target as Node)) onClose();
+    };
+    document.addEventListener("keydown", onKeyDown, true);
+    window.addEventListener("pointerdown", onPointerDown, true);
+    window.addEventListener("scroll", onClose, true);
+    window.addEventListener("resize", onClose);
+    return () => {
+      document.removeEventListener("keydown", onKeyDown, true);
+      window.removeEventListener("pointerdown", onPointerDown, true);
+      window.removeEventListener("scroll", onClose, true);
+      window.removeEventListener("resize", onClose);
+    };
+  }, [onClose]);
+
+  useEffect(() => {
+    (ref.current?.firstElementChild as HTMLElement | null)?.focus();
+  }, []);
+
+  return createPortal(
+    <div
+      ref={ref}
+      role="menu"
+      className="context-menu fixed z-modal min-w-[160px] rounded-r-2 border border-border-strong bg-surface py-sp-1 shadow-2"
+      style={{ left: pos.left, top: pos.top }}
+    >
+      {items.map((item) => (
+        <button
+          key={item.label}
+          type="button"
+          role="menuitem"
+          className={`context-menu-item block w-full px-sp-3 py-sp-1 text-left text-fs-12 hover:bg-surface-2 ${
+            item.danger ? "is-danger text-danger" : "text-ink"
+          }`}
+          onClick={(e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            onClose();
+            item.onSelect();
+          }}
+        >
+          {item.label}
+        </button>
+      ))}
+    </div>,
+    document.body,
+  );
+}

web/src/components/common/index.ts

@@ -0,0 +1 @@
+export { ContextMenu, type ContextMenuItem, type ContextMenuProps } from "./ContextMenu.js";

web/src/components/daemon/DaemonLink.test.ts

@@ -1,8 +1,7 @@
 import { describe, expect, it, vi } from "vitest";
 
-import { DaemonLink, compareIdentity, formatRelease } from "./daemonLink.js";
-import type { Scheduler } from "./events.js";
-import type { DaemonInfo } from "./types.js";
+import { GRACE_MS, POLL_MS, compareIdentity, createDaemonLinkStore, formatRelease, type Scheduler } from "./DaemonLink.js";
+import type { DaemonInfo } from "../../types.js";
 
 function info(commit: string, instance: string, date = "2026-09-02T14:03:11+01:00"): DaemonInfo {
   return {
@@ -14,14 +13,18 @@ function info(commit: string, instance: string, date = "2026-09-02T14:03:11+01:0
   };
 }
 
-/** Scheduler whose timers only fire when the test says so. */
-function manual(): Scheduler & { run(): void; pending(): number } {
+/** Scheduler whose timers only fire when the test says so, recording the
+ *  delay each was scheduled with. */
+function manual(): Scheduler & { run(): void; pending(): number; delays: number[] } {
   let next = 1;
   const timers = new Map<number, () => void>();
+  const delays: number[] = [];
   return {
-    setTimer(fn) {
+    delays,
+    setTimer(fn, ms) {
       const h = next++;
       timers.set(h, fn);
+      delays.push(ms);
       return h;
     },
     clearTimer(h) {
@@ -73,21 +76,22 @@ describe("formatRelease", () => {
   });
 });
 
-describe("DaemonLink", () => {
-  it("starts online once the first probe lands", async () => {
-    const link = new DaemonLink({
+describe("daemon link store", () => {
+  it("starts in the connecting state until the first probe lands", async () => {
+    const store = createDaemonLinkStore({
       fetchInfo: async () => info("aaa", "i1"),
       scheduler: manual(),
       reload: () => {},
     });
-    await link.start();
-    expect(link.status().state).toBe("online");
-    expect(link.status().build?.commit).toBe("aaa");
+    expect(store.getState().state).toBe("connecting");
+    await store.getState().probe();
+    expect(store.getState().state).toBe("online");
+    expect(store.getState().build?.commit).toBe("aaa");
   });
 
   it("holds the modal back during the grace period, then blocks", async () => {
     const sched = manual();
-    const link = new DaemonLink({
+    const store = createDaemonLinkStore({
       fetchInfo: async () => {
         throw new Error("down");
       },
@@ -95,19 +99,19 @@ describe("DaemonLink", () => {
       reload: () => {},
       graceMs: 1000,
     });
-    link.noteDisconnected();
+    store.getState().noteDisconnected();
     // Still inside the grace window: the dot goes amber, nothing blocks.
-    expect(link.status().state).toBe("reconnecting");
+    expect(store.getState().state).toBe("reconnecting");
     sched.run();
     await Promise.resolve();
-    expect(link.status().state).toBe("down");
+    expect(store.getState().state).toBe("down");
   });
 
   it("unlocks without reloading when the same build comes back", async () => {
     const sched = manual();
     const reload = vi.fn();
     let reply: DaemonInfo | null = info("aaa", "i1");
-    const link = new DaemonLink({
+    const store = createDaemonLinkStore({
       fetchInfo: async () => {
         if (!reply) throw new Error("down");
         return reply;
@@ -115,70 +119,45 @@ describe("DaemonLink", () => {
       scheduler: sched,
       reload,
     });
-    await link.start();
+    await store.getState().probe();
 
     reply = null;
-    link.noteDisconnected();
+    store.getState().noteDisconnected();
     sched.run(); // grace expires → blocked, poll scheduled
     await Promise.resolve();
-    expect(link.status().state).toBe("down");
+    expect(store.getState().state).toBe("down");
 
     // Same commit, new process: a restart, not an upgrade — the page stays.
     reply = info("aaa", "i2");
-    await link.probe();
+    await store.getState().probe();
     expect(reload).not.toHaveBeenCalled();
-    expect(link.status().state).toBe("online");
-  });
-
-  it("rechecks immediately when the browser returns from the background", async () => {
-    const sched = manual();
-    let reply: DaemonInfo | null = info("aaa", "i1");
-    const link = new DaemonLink({
-      fetchInfo: async () => {
-        if (!reply) throw new Error("down");
-        return reply;
-      },
-      scheduler: sched,
-      reload: () => {},
-    });
-    await link.start();
-
-    reply = null;
-    link.noteDisconnected();
-    sched.run();
-    await Promise.resolve();
-    expect(link.status().state).toBe("down");
-
-    reply = info("aaa", "i1");
-    link.recover();
-    await Promise.resolve();
-    expect(link.status().state).toBe("online");
+    expect(store.getState().state).toBe("online");
   });
 
   it("reloads the page when the daemon comes back on a new commit", async () => {
     const sched = manual();
     const reload = vi.fn();
     let reply = info("aaa", "i1");
-    const link = new DaemonLink({
+    const store = createDaemonLinkStore({
       fetchInfo: async () => reply,
       scheduler: sched,
       reload,
     });
-    await link.start();
+    await store.getState().probe();
 
-    link.noteDisconnected();
+    store.getState().noteDisconnected();
     reply = info("bbb", "i2");
-    await link.probe();
+    await store.getState().probe();
     expect(reload).toHaveBeenCalledTimes(1);
     // Left blocked deliberately: the reload is what ends this page's life, and
     // flashing an unlocked UI in between would let the user act on stale code.
-    expect(link.status().state).toBe("updating");
+    expect(store.getState().state).toBe("updating");
   });
 
   it("keeps polling on a scheduled cadence while the daemon is unreachable", async () => {
     const sched = manual();
     let attempts = 0;
-    const link = new DaemonLink({
+    const store = createDaemonLinkStore({
       fetchInfo: async () => {
         attempts += 1;
         throw new Error("down");
@@ -186,7 +165,7 @@ describe("DaemonLink", () => {
       scheduler: sched,
       reload: () => {},
     });
-    link.noteDisconnected();
+    store.getState().noteDisconnected();
     sched.run(); // grace → first poll
     await Promise.resolve();
     await Promise.resolve();
@@ -196,23 +175,41 @@ describe("DaemonLink", () => {
     await Promise.resolve();
     await Promise.resolve();
     expect(attempts).toBeGreaterThan(first);
-    link.stop();
+    store.getState().stop();
   });
 
   it("notifies subscribers on every state change", async () => {
     const sched = manual();
     const seen: string[] = [];
-    const link = new DaemonLink({
+    const store = createDaemonLinkStore({
       fetchInfo: async () => info("aaa", "i1"),
       scheduler: sched,
       reload: () => {},
     });
-    link.subscribe((s) => seen.push(s.state));
-    await link.start();
-    link.noteDisconnected();
+    store.subscribe((s) => seen.push(s.state));
+    await store.getState().probe();
+    store.getState().noteDisconnected();
     sched.run();
     await Promise.resolve();
     expect(seen).toContain("reconnecting");
-    expect(seen[0]).toBe("connecting");
+  });
+
+  it("schedules the grace timer and poll at the documented defaults", async () => {
+    const sched = manual();
+    const store = createDaemonLinkStore({
+      fetchInfo: async () => {
+        throw new Error("down");
+      },
+      scheduler: sched,
+      reload: () => {},
+    });
+    expect(GRACE_MS).toBe(1200);
+    expect(POLL_MS).toBe(700);
+    store.getState().noteDisconnected();
+    expect(sched.delays).toEqual([GRACE_MS]);
+    sched.run(); // grace fires → schedules the first poll
+    await Promise.resolve();
+    await Promise.resolve();
+    expect(sched.delays).toEqual([GRACE_MS, POLL_MS]);
   });
 });

web/src/components/daemon/DaemonLink.test.tsx

@@ -0,0 +1,71 @@
+// @vitest-environment happy-dom
+import { cleanup, render } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { createDaemonLinkStore } from "./DaemonLink.js";
+import { DaemonLink } from "./DaemonLink.js";
+
+afterEach(() => cleanup());
+
+describe("DaemonLink", () => {
+  it("probes once on mount, regardless of the initial connected value", async () => {
+    const fetchInfo = vi.fn().mockResolvedValue({ hostname: "h", version: "1", presets: [] });
+    const store = createDaemonLinkStore({ fetchInfo, scheduler: { setTimer: () => 0, clearTimer: () => {} } });
+    render(<DaemonLink store={store} connected={false} />);
+    await Promise.resolve();
+    expect(fetchInfo).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not treat the initial connected value as a transition", async () => {
+    const store = createDaemonLinkStore({
+      fetchInfo: async () => ({ hostname: "h", version: "1", presets: [] }),
+      scheduler: { setTimer: () => 0, clearTimer: () => {} },
+    });
+    render(<DaemonLink store={store} connected={true} />);
+    await Promise.resolve();
+    // Only the mount probe ran — no extra noteConnected() probe on top of it.
+    expect(store.getState().state).toBe("online");
+  });
+
+  it("forwards a later connected drop to noteDisconnected", async () => {
+    const store = createDaemonLinkStore({
+      fetchInfo: async () => ({ hostname: "h", version: "1", presets: [] }),
+      scheduler: { setTimer: () => 0, clearTimer: () => {} },
+    });
+    const { rerender } = render(<DaemonLink store={store} connected={true} />);
+    await Promise.resolve();
+    expect(store.getState().state).toBe("online");
+
+    rerender(<DaemonLink store={store} connected={false} />);
+    expect(store.getState().state).toBe("reconnecting");
+  });
+
+  it("forwards a later connected recovery to noteConnected", async () => {
+    const fetchInfo = vi.fn().mockResolvedValue({ hostname: "h", version: "1", presets: [] });
+    const store = createDaemonLinkStore({ fetchInfo, scheduler: { setTimer: () => 0, clearTimer: () => {} } });
+    const { rerender } = render(<DaemonLink store={store} connected={true} />);
+    await Promise.resolve();
+    expect(store.getState().state).toBe("online");
+
+    // The socket dropped: noteDisconnected() moves off "online" so the coming
+    // recovery isn't a no-op.
+    rerender(<DaemonLink store={store} connected={false} />);
+    expect(store.getState().state).toBe("reconnecting");
+    fetchInfo.mockClear();
+
+    rerender(<DaemonLink store={store} connected={true} />);
+    await Promise.resolve();
+    expect(fetchInfo).toHaveBeenCalledTimes(1);
+    expect(store.getState().state).toBe("online");
+  });
+
+  it("stops the store's polling on unmount", () => {
+    const store = createDaemonLinkStore({
+      fetchInfo: async () => ({ hostname: "h", version: "1", presets: [] }),
+    });
+    const stop = vi.spyOn(store.getState(), "stop");
+    const { unmount } = render(<DaemonLink store={store} connected={false} />);
+    unmount();
+    expect(stop).toHaveBeenCalledTimes(1);
+  });
+});

web/src/components/daemon/DaemonLink.tsx

@@ -0,0 +1,234 @@
+// React port of ../../daemonLink.ts. The link to the daemon behind this page:
+// is it up, and which release is it? `RestartOverlay` (./RestartOverlay.tsx)
+// renders what this reports. See docs/RESTART.md for the restart contract.
+
+import { useEffect, useRef } from "react";
+import { create } from "zustand";
+
+import { getDaemonInfo } from "../../api.js";
+import type { BuildInfo, DaemonInfo } from "../../types.js";
+
+/**
+ * - `connecting` — first probe hasn't landed yet.
+ * - `online` — the daemon answered and is the same process, or a resolved new one.
+ * - `reconnecting` — the socket dropped, but within the grace window; a blip
+ *   shouldn't throw a modal in the user's face.
+ * - `down` — unreachable past the grace window: the overlay blocks the UI and
+ *   the poll runs until it answers.
+ * - `updating` — it answered on a different commit; the page is reloading and
+ *   stays blocked until it does.
+ */
+export type LinkState = "connecting" | "online" | "reconnecting" | "down" | "updating";
+
+/** What happened between two `/api/info` replies. */
+export type RestartKind = "same" | "restarted" | "upgraded";
+
+/** How long a dropped socket may stay dropped before the UI blocks. Long enough
+ *  to ride out a wifi hiccup, short enough that a real restart is visible. */
+export const GRACE_MS = 1200;
+/** Cadence of the `/api/info` poll while the daemon is unreachable. */
+export const POLL_MS = 700;
+
+/**
+ * Compare two daemon replies.
+ *
+ * The commit decides first: a different one means new code, which for a browser
+ * means new assets. The per-process `instance` catches the rest — a restart of
+ * the same build, which needs no reload. A daemon built outside a git checkout
+ * reports an empty commit, so an empty-vs-empty pair never counts as an
+ * upgrade; the instance still reports the restart.
+ */
+export function compareIdentity(before: DaemonInfo, after: DaemonInfo): RestartKind {
+  const a = before.build?.commit ?? "";
+  const b = after.build?.commit ?? "";
+  if (a && b && a !== b) return "upgraded";
+  if (before.instance && after.instance && before.instance !== after.instance) return "restarted";
+  return "same";
+}
+
+/** One line naming a release: `f89be4a716c7 · 2026-09-02`, with `(dirty)` when
+ *  the build carried uncommitted changes. Empty builds say so rather than
+ *  rendering a blank tooltip. */
+export function formatRelease(build: BuildInfo | undefined): string {
+  if (!build?.commit) return "unknown release";
+  const day = build.commit_date ? build.commit_date.slice(0, 10) : "";
+  const parts = [build.commit];
+  if (day) parts.push(`· ${day}`);
+  if (build.dirty) parts.push("(dirty)");
+  return parts.join(" ");
+}
+
+/** Schedules a probe/grace timer; returns a handle `clearTimer` understands. */
+export interface Scheduler {
+  setTimer(fn: () => void, ms: number): number;
+  clearTimer(handle: number): void;
+}
+
+const browserScheduler: Scheduler = {
+  setTimer: (fn, ms) => window.setTimeout(fn, ms),
+  clearTimer: (h) => window.clearTimeout(h),
+};
+
+export interface DaemonLinkState {
+  state: LinkState;
+  /** The release the daemon last reported. Undefined until the first probe,
+   *  and on a daemon too old to carry one. */
+  build?: BuildInfo;
+  /** Hostname the daemon reports, for the indicator's tooltip. */
+  hostname?: string;
+  /** How many probes have failed in the current outage — the overlay counts
+   *  attempts so a long restart doesn't look frozen. */
+  attempts: number;
+}
+
+export interface DaemonLinkActions {
+  /** One `/api/info` round-trip. Resolves `true` when the daemon answered. */
+  probe(): Promise<boolean>;
+  /** The events socket dropped. Starts the grace timer and the poll. */
+  noteDisconnected(): void;
+  /** The events socket came back. It carries no identity of its own, so the
+   *  state only clears once a probe confirms *which* daemon answered — a
+   *  reconnect to an upgraded daemon must reload, not resume. */
+  noteConnected(): void;
+  /** Stop polling. */
+  stop(): void;
+}
+
+export type DaemonLinkStore = DaemonLinkState & DaemonLinkActions;
+
+export interface DaemonLinkOptions {
+  /** Injectable for tests; defaults to `GET /api/info`. */
+  fetchInfo?: () => Promise<DaemonInfo>;
+  scheduler?: Scheduler;
+  /** What an upgrade does. Injectable so tests don't navigate. */
+  reload?: () => void;
+  graceMs?: number;
+  pollMs?: number;
+}
+
+/** Builds an isolated daemon-link store — same shape as
+ *  {@link ../../stores/catalogStore.js!createCatalogStore}: both a React hook
+ *  and a plain object (`getState`/`subscribe`), so it drives the overlay
+ *  whether or not React is the one calling `noteConnected`/`noteDisconnected`. */
+export function createDaemonLinkStore(opts: DaemonLinkOptions = {}) {
+  const fetchInfo = opts.fetchInfo ?? getDaemonInfo;
+  const scheduler = opts.scheduler ?? browserScheduler;
+  const reload = opts.reload ?? (() => window.location.reload());
+  const graceMs = opts.graceMs ?? GRACE_MS;
+  const pollMs = opts.pollMs ?? POLL_MS;
+
+  let identity: DaemonInfo | null = null;
+  let graceTimer: number | null = null;
+  let pollTimer: number | null = null;
+
+  return create<DaemonLinkStore>((set, get) => {
+    function clearTimers(): void {
+      if (graceTimer !== null) {
+        scheduler.clearTimer(graceTimer);
+        graceTimer = null;
+      }
+      if (pollTimer !== null) {
+        scheduler.clearTimer(pollTimer);
+        pollTimer = null;
+      }
+    }
+
+    async function probe(): Promise<boolean> {
+      let info: DaemonInfo;
+      try {
+        info = await fetchInfo();
+      } catch {
+        set((s) => ({ attempts: s.attempts + 1 }));
+        return false;
+      }
+      const before = identity;
+      identity = info;
+      if (before && compareIdentity(before, info) === "upgraded") {
+        // Stay blocked through the reload: an unlocked frame here would let the
+        // user drive new server code from the bundle it just replaced.
+        set({ state: "updating", build: info.build, hostname: info.hostname });
+        reload();
+        return true;
+      }
+      clearTimers();
+      set({ state: "online", build: info.build, hostname: info.hostname, attempts: 0 });
+      return true;
+    }
+
+    async function poll(): Promise<void> {
+      const state = get().state;
+      if (state === "online" || state === "updating") return;
+      const ok = await probe();
+      if (ok || pollTimer !== null) return;
+      pollTimer = scheduler.setTimer(() => {
+        pollTimer = null;
+        void poll();
+      }, pollMs);
+    }
+
+    return {
+      state: "connecting",
+      build: undefined,
+      hostname: undefined,
+      attempts: 0,
+
+      probe,
+
+      noteDisconnected() {
+        const state = get().state;
+        if (state === "down" || state === "updating") return;
+        set({ state: "reconnecting", attempts: 0 });
+        if (graceTimer === null) {
+          graceTimer = scheduler.setTimer(() => {
+            graceTimer = null;
+            if (get().state === "reconnecting") set({ state: "down" });
+            void poll();
+          }, graceMs);
+        }
+      },
+
+      noteConnected() {
+        const state = get().state;
+        if (state === "online" || state === "updating") return;
+        void probe();
+      },
+
+      stop: clearTimers,
+    };
+  });
+}
+
+export type DaemonLinkStoreApi = ReturnType<typeof createDaemonLinkStore>;
+
+export interface DaemonLinkProps {
+  /** The link store this instance drives — `RestartOverlay` (and, later, the
+   *  sidebar's status indicator) read the same one. */
+  store: DaemonLinkStoreApi;
+  /** The catalog store's `connected` field (docs/RESTART.md): the events
+   *  socket dying is the earliest signal a restart happened, ahead of any
+   *  poll. Pass `useStore(catalogStore, (s) => s.connected)`. */
+  connected: boolean;
+}
+
+/**
+ * Renders nothing — the controller that wires a `DaemonLinkStore` to the
+ * catalog's socket state. Mount once near the app root; `RestartOverlay`
+ * reads the store it drives.
+ */
+export function DaemonLink({ store, connected }: DaemonLinkProps): null {
+  const mounted = useRef(false);
+
+  useEffect(() => {
+    if (!mounted.current) {
+      mounted.current = true;
+      void store.getState().probe();
+      return;
+    }
+    if (connected) store.getState().noteConnected();
+    else store.getState().noteDisconnected();
+  }, [store, connected]);
+
+  useEffect(() => () => store.getState().stop(), [store]);
+
+  return null;
+}

web/src/components/daemon/RestartOverlay.test.tsx

@@ -0,0 +1,78 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { createDaemonLinkStore, type DaemonLinkStoreApi } from "./DaemonLink.js";
+import { RestartOverlay } from "./RestartOverlay.js";
+
+afterEach(() => cleanup());
+
+function storeAt(state: "connecting" | "online" | "reconnecting" | "down" | "updating"): DaemonLinkStoreApi {
+  const store = createDaemonLinkStore({ scheduler: { setTimer: () => 0, clearTimer: () => {} } });
+  store.setState({ state });
+  return store;
+}
+
+describe("RestartOverlay", () => {
+  it("renders nothing while connecting, online, or reconnecting", () => {
+    for (const state of ["connecting", "online", "reconnecting"] as const) {
+      const { unmount } = render(<RestartOverlay store={storeAt(state)} />);
+      expect(screen.queryByRole("alertdialog")).toBeNull();
+      unmount();
+    }
+  });
+
+  it("blocks with a restarting message when down", () => {
+    render(<RestartOverlay store={storeAt("down")} />);
+    const dialog = screen.getByRole("alertdialog");
+    expect(dialog.textContent).toContain("Maestro is restarting");
+    expect(dialog.textContent).toContain("Waiting for the daemon to come back…");
+  });
+
+  it("counts attempts once more than one probe has failed", () => {
+    const store = storeAt("down");
+    store.setState({ attempts: 3 });
+    render(<RestartOverlay store={store} />);
+    expect(screen.getByRole("alertdialog").textContent).toContain("(3 attempts)");
+  });
+
+  it("says it is reloading when updating", () => {
+    render(<RestartOverlay store={storeAt("updating")} />);
+    const dialog = screen.getByRole("alertdialog");
+    expect(dialog.textContent).toContain("Maestro was updated");
+    expect(dialog.textContent).toContain("Reloading this page onto the new release…");
+  });
+
+  it("names the release from the store's build", () => {
+    const store = storeAt("down");
+    store.setState({ build: { commit: "f89be4a", commit_date: "2026-09-02T00:00:00Z", dirty: false } });
+    render(<RestartOverlay store={store} />);
+    expect(screen.getByRole("alertdialog").textContent).toContain("f89be4a · 2026-09-02");
+  });
+
+  it("clears the moment the store reports the link is back", () => {
+    const store = storeAt("down");
+    const { rerender } = render(<RestartOverlay store={store} />);
+    expect(screen.queryByRole("alertdialog")).not.toBeNull();
+    store.setState({ state: "online" });
+    rerender(<RestartOverlay store={store} />);
+    expect(screen.queryByRole("alertdialog")).toBeNull();
+  });
+
+  it("swallows keyboard shortcuts while blocking, but not once cleared", () => {
+    const store = storeAt("down");
+    const handler = vi.fn();
+    window.addEventListener("keydown", handler);
+    const { rerender } = render(<RestartOverlay store={store} />);
+
+    fireEvent.keyDown(window, { key: "n" });
+    expect(handler).not.toHaveBeenCalled();
+
+    store.setState({ state: "online" });
+    rerender(<RestartOverlay store={store} />);
+    fireEvent.keyDown(window, { key: "n" });
+    expect(handler).toHaveBeenCalledTimes(1);
+
+    window.removeEventListener("keydown", handler);
+  });
+});

web/src/components/daemon/RestartOverlay.tsx

@@ -0,0 +1,62 @@
+// React port of ../../restartOverlay.ts. Blocking overlay for a daemon that
+// went away — see docs/RESTART.md.
+//
+// Rendered while the link is `down` or `updating`, gone the moment it is
+// back. It owns no polling of its own: `DaemonLink` polls, this only renders
+// what the store reports.
+
+import { useEffect } from "react";
+import { useStore } from "zustand";
+
+import { formatRelease, type DaemonLinkStoreApi } from "./DaemonLink.js";
+
+export interface RestartOverlayProps {
+  /** The same store a sibling `DaemonLink` drives. */
+  store: DaemonLinkStoreApi;
+}
+
+/** The poll runs while this is up; saying how many tries have gone by is what
+ *  separates "still restarting" from "wedged" for someone staring at it. */
+function attemptText(attempts: number): string {
+  if (attempts <= 1) return "Waiting for the daemon to come back…";
+  return `Waiting for the daemon to come back… (${attempts} attempts)`;
+}
+
+function swallow(e: KeyboardEvent): void {
+  e.stopImmediatePropagation();
+}
+
+export function RestartOverlay({ store }: RestartOverlayProps) {
+  const state = useStore(store, (s) => s.state);
+  const build = useStore(store, (s) => s.build);
+  const attempts = useStore(store, (s) => s.attempts);
+
+  const blocking = state === "down" || state === "updating";
+
+  // The app's shortcuts live on `window`, so hiding the UI behind a backdrop
+  // does not stop them: `n` would still open a spawn form against a daemon
+  // that is not there. Swallow keys in the capture phase until the link is
+  // back, without `preventDefault` so the browser's own chords still work.
+  useEffect(() => {
+    if (!blocking) return;
+    window.addEventListener("keydown", swallow, true);
+    return () => window.removeEventListener("keydown", swallow, true);
+  }, [blocking]);
+
+  if (!blocking) return null;
+
+  const updating = state === "updating";
+
+  return (
+    <div className="modal-backdrop restart-backdrop">
+      <div className="modal restart-modal" role="alertdialog" aria-modal="true" aria-labelledby="restart-title">
+        <div className="restart-spinner" aria-hidden="true" />
+        <h2 id="restart-title">{updating ? "Maestro was updated" : "Maestro is restarting"}</h2>
+        <p className="restart-detail">
+          {updating ? "Reloading this page onto the new release…" : attemptText(attempts)}
+        </p>
+        <p className="restart-release">{formatRelease(build)}</p>
+      </div>
+    </div>
+  );
+}

web/src/components/dialogs/HelpOverlay.test.tsx

@@ -0,0 +1,82 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it } from "vitest";
+
+import { keyCaps } from "../../commands.js";
+import { groupedCommands } from "./model.js";
+import { HelpOverlay } from "./HelpOverlay.js";
+
+afterEach(() => {
+  cleanup();
+});
+
+function press(key: string, init: KeyboardEventInit = {}): void {
+  fireEvent.keyDown(window, { key, ...init });
+}
+
+describe("HelpOverlay", () => {
+  it("opens on ? and closes on a second ?", () => {
+    render(<HelpOverlay />);
+    expect(screen.queryByRole("dialog")).toBeNull();
+    press("?", { shiftKey: true });
+    expect(screen.queryByRole("dialog")).not.toBeNull();
+    press("?", { shiftKey: true });
+    expect(screen.queryByRole("dialog")).toBeNull();
+  });
+
+  it("ignores ? while typing and when a non-shift modifier is held", () => {
+    render(<HelpOverlay />);
+    const input = document.createElement("input");
+    document.body.appendChild(input);
+    fireEvent.keyDown(input, { key: "?", shiftKey: true });
+    expect(screen.queryByRole("dialog")).toBeNull();
+
+    press("?", { ctrlKey: true });
+    expect(screen.queryByRole("dialog")).toBeNull();
+    input.remove();
+  });
+
+  it("closes on Escape, on the close button, and on a click outside the panel", () => {
+    render(<HelpOverlay />);
+
+    press("?", { shiftKey: true });
+    press("Escape");
+    expect(screen.queryByRole("dialog")).toBeNull();
+
+    press("?", { shiftKey: true });
+    fireEvent.click(screen.getByRole("button", { name: "Close" }));
+    expect(screen.queryByRole("dialog")).toBeNull();
+
+    press("?", { shiftKey: true });
+    fireEvent.click(screen.getByRole("dialog"));
+    expect(screen.queryByRole("dialog")).toBeNull();
+  });
+
+  it("stays open for a click inside the panel", () => {
+    render(<HelpOverlay />);
+    press("?", { shiftKey: true });
+    fireEvent.click(document.querySelector(".help-panel") as HTMLElement);
+    expect(screen.queryByRole("dialog")).not.toBeNull();
+  });
+
+  it("renders exactly the commands the registry has bound, grouped", () => {
+    render(<HelpOverlay />);
+    press("?", { shiftKey: true });
+
+    const groups = groupedCommands();
+    expect([...document.querySelectorAll(".help-group-title")].map((h) => h.textContent)).toEqual(
+      groups.map((g) => g.title),
+    );
+    expect(
+      [...document.querySelectorAll<HTMLElement>(".help-row")].map((r) => r.dataset.commandId),
+    ).toEqual(groups.flatMap((g) => g.items.map((c) => c.id)));
+    expect([...document.querySelectorAll(".help-desc")].map((d) => d.textContent)).toEqual(
+      groups.flatMap((g) => g.items.map((c) => c.label)),
+    );
+    expect(
+      [...document.querySelectorAll(".help-row")].map((r) =>
+        [...r.querySelectorAll("kbd")].map((k) => k.textContent).join(" "),
+      ),
+    ).toEqual(groups.flatMap((g) => g.items.map((c) => keyCaps(c.keys[0]).join(" "))));
+  });
+});

web/src/components/dialogs/HelpOverlay.tsx

@@ -0,0 +1,78 @@
+// React port of ../../help.ts: the `?` overlay renders the command registry
+// (commands.ts) directly — the same list that dispatches the keys — so a
+// binding can never be documented as one thing and do another.
+
+import { useEffect, useState } from "react";
+import { createPortal } from "react-dom";
+
+import { CommandSet, defineCommands, keyCaps } from "../../commands.js";
+import { groupedCommands } from "./model.js";
+
+export function HelpOverlay() {
+  const [open, setOpen] = useState(false);
+
+  useEffect(() => {
+    const helpKeys = new CommandSet(defineCommands({ "help.toggle": () => setOpen((o) => !o) }));
+    const overlayKeys = new CommandSet(defineCommands({ "help.close": () => setOpen(false) }));
+    const onKeydown = (e: KeyboardEvent) => {
+      if (open && overlayKeys.handle(e)) return;
+      helpKeys.handle(e);
+    };
+    window.addEventListener("keydown", onKeydown);
+    return () => window.removeEventListener("keydown", onKeydown);
+  }, [open]);
+
+  if (!open) return null;
+
+  const close = () => setOpen(false);
+
+  return createPortal(
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label="Keyboard shortcuts"
+      className="help-overlay fixed inset-0 z-modal flex items-center justify-center bg-bg/70"
+      onClick={(e) => {
+        if (e.target === e.currentTarget) close();
+      }}
+    >
+      <div className="help-panel max-h-[80vh] w-full max-w-[560px] overflow-auto rounded-r-3 border border-border bg-surface p-sp-4 shadow-2">
+        <header className="help-head flex items-center justify-between">
+          <h2 className="help-title m-0 text-fs-15 font-semibold text-ink">Keyboard shortcuts</h2>
+          <button
+            type="button"
+            aria-label="Close"
+            className="help-close rounded-r-1 px-sp-2 py-1 text-fs-15 text-muted hover:text-ink"
+            onClick={close}
+          >
+            ✕
+          </button>
+        </header>
+        {groupedCommands().map((group) => (
+          <section key={group.title} className="help-group mt-sp-3">
+            <h3 className="help-group-title text-fs-12 font-semibold text-muted">{group.title}</h3>
+            <dl className="help-list mt-sp-1">
+              {group.items.map((cmd) => (
+                <div
+                  key={cmd.id}
+                  className="help-row flex items-center justify-between gap-sp-3 py-sp-1"
+                  data-command-id={cmd.id}
+                >
+                  <dt className="help-keys m-0 flex gap-sp-1">
+                    {keyCaps(cmd.keys[0]).map((cap, i) => (
+                      <kbd key={i} className="rounded-r-1 border border-border px-sp-1 text-fs-11">
+                        {cap}
+                      </kbd>
+                    ))}
+                  </dt>
+                  <dd className="help-desc m-0 text-fs-12 text-ink">{cmd.label}</dd>
+                </div>
+              ))}
+            </dl>
+          </section>
+        ))}
+      </div>
+    </div>,
+    document.body,
+  );
+}

web/src/components/dialogs/KillDialog.test.tsx

@@ -0,0 +1,74 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { KillDialog } from "./KillDialog.js";
+
+afterEach(() => {
+  cleanup();
+});
+
+describe("KillDialog", () => {
+  it("focuses the kill button, so Enter confirms", () => {
+    render(<KillDialog name="alpha" blockers={null} onConfirm={() => Promise.resolve()} onCancel={vi.fn()} />);
+    expect(document.activeElement).toBe(screen.getByRole("button", { name: "Kill" }));
+  });
+
+  it("focuses the force button too", () => {
+    render(
+      <KillDialog
+        name="alpha"
+        blockers={null}
+        force
+        reason="worktree is dirty."
+        onConfirm={() => Promise.resolve()}
+        onCancel={vi.fn()}
+      />,
+    );
+    expect(document.activeElement).toBe(screen.getByRole("button", { name: "Force kill" }));
+  });
+
+  it("names the blockers in the confirm body", () => {
+    render(
+      <KillDialog
+        name="alpha"
+        blockers={{ uncommitted_files: 2, untracked_files: 0, unpushed_commits: 0 }}
+        onConfirm={() => Promise.resolve()}
+        onCancel={vi.fn()}
+      />,
+    );
+    expect(screen.getByText(/will be refused unless it is forced/)).not.toBeNull();
+  });
+
+  it("cancels on Cancel, on Escape and on a backdrop click", () => {
+    const onCancel = vi.fn();
+    const first = render(<KillDialog name="alpha" blockers={null} onConfirm={() => Promise.resolve()} onCancel={onCancel} />);
+    fireEvent.click(screen.getByRole("button", { name: "Cancel" }));
+    expect(onCancel).toHaveBeenCalledTimes(1);
+    first.unmount();
+
+    const second = render(<KillDialog name="alpha" blockers={null} onConfirm={() => Promise.resolve()} onCancel={onCancel} />);
+    fireEvent.keyDown(screen.getByRole("dialog"), { key: "Escape" });
+    expect(onCancel).toHaveBeenCalledTimes(2);
+    second.unmount();
+
+    render(<KillDialog name="alpha" blockers={null} onConfirm={() => Promise.resolve()} onCancel={onCancel} />);
+    fireEvent.click(screen.getByRole("dialog"));
+    expect(onCancel).toHaveBeenCalledTimes(3);
+  });
+
+  it("disables the button while pending and shows a rejection inline, so the press can be retried", async () => {
+    let reject: (e: Error) => void = () => {};
+    const onConfirm = vi.fn(() => new Promise<void>((_, r) => (reject = r)));
+    render(<KillDialog name="alpha" blockers={null} onConfirm={onConfirm} onCancel={vi.fn()} />);
+
+    const kill = screen.getByRole("button", { name: "Kill" }) as HTMLButtonElement;
+    fireEvent.click(kill);
+    expect(onConfirm).toHaveBeenCalledOnce();
+    expect(kill.disabled).toBe(true);
+
+    reject(new Error("daemon unreachable"));
+    await waitFor(() => expect(kill.disabled).toBe(false));
+    expect(screen.getByText("Failed to kill: daemon unreachable")).not.toBeNull();
+  });
+});

web/src/components/dialogs/KillDialog.tsx

@@ -0,0 +1,95 @@
+// React port of ../../killDialog.ts: the two kill prompts (#81, #160). The
+// daemon refuses an unforced kill over a worktree holding unsaved work; the
+// same component in `force` mode is the override that follows that refusal.
+
+import { useEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
+
+import { formatInTheWay, type InTheWay } from "../../types.js";
+
+export interface KillDialogProps {
+  /** Session name, as the sidebar shows it. */
+  name: string;
+  /** What the card last saw in the way, when anything was. */
+  blockers: InTheWay | null;
+  /** Set once the daemon has refused an unforced kill: this pass forces it,
+   *  and `reason` carries the daemon's refusal message. */
+  force?: boolean;
+  /** Message from the daemon's refusal, shown when there are no blockers to
+   *  spell out. */
+  reason?: string;
+  /** Run the kill (or the forced kill). A rejection is rendered inline, and
+   *  the dialog stays open so the press can be retried. */
+  onConfirm(): Promise<void>;
+  onCancel(): void;
+}
+
+export function KillDialog(props: KillDialogProps) {
+  const { name, blockers, force, reason, onConfirm, onCancel } = props;
+  const confirmRef = useRef<HTMLButtonElement>(null);
+  const [pending, setPending] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  // The acting button takes the focus in both modes: the operator already
+  // asked for the kill, so Enter confirms it.
+  useEffect(() => confirmRef.current?.focus(), []);
+
+  const handleConfirm = () => {
+    setPending(true);
+    setError(null);
+    void onConfirm().catch((e: unknown) => {
+      setPending(false);
+      setError(`Failed to kill: ${(e as Error).message}`);
+    });
+  };
+
+  const body = blockers
+    ? force
+      ? `Its worktree still has ${formatInTheWay(blockers)}. Forcing the kill removes the session and leaves the worktree on disk.`
+      : `Its worktree still has ${formatInTheWay(blockers)}. The kill will be refused unless it is forced.`
+    : force
+      ? `${reason ?? ""} Forcing the kill removes the session and leaves the worktree on disk.`
+      : "The session and everything running in it go away. Its worktree stays on disk.";
+
+  return createPortal(
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={`Kill ${name}`}
+      className="kill-dialog fixed inset-0 z-modal flex items-center justify-center bg-bg/70"
+      onClick={(e) => {
+        if (e.target === e.currentTarget) onCancel();
+      }}
+      onKeyDown={(e) => {
+        if (e.key === "Escape") onCancel();
+      }}
+    >
+      <div className="kill-dialog-panel min-w-[280px] max-w-[420px] rounded-r-2 border border-border-strong bg-surface p-sp-4 shadow-2">
+        <h2 className="kill-dialog-title m-0 text-fs-15 font-semibold text-ink">Kill &quot;{name}&quot;?</h2>
+        <p className="kill-dialog-body mt-sp-2 text-fs-13 text-ink">{body}</p>
+        {error && <p className="kill-dialog-error mt-sp-2 text-fs-12 text-danger">{error}</p>}
+        <div className="kill-dialog-actions mt-sp-3 flex justify-end gap-sp-2">
+          <button
+            type="button"
+            className="kill-dialog-cancel rounded-r-1 border border-border px-sp-3 py-sp-1 text-fs-12 text-ink"
+            onClick={onCancel}
+          >
+            Cancel
+          </button>
+          <button
+            ref={confirmRef}
+            type="button"
+            disabled={pending}
+            className={`rounded-r-1 bg-danger px-sp-3 py-sp-1 text-fs-12 text-accent-ink disabled:opacity-60 ${
+              force ? "kill-dialog-force" : "kill-dialog-kill"
+            }`}
+            onClick={handleConfirm}
+          >
+            {force ? "Force kill" : "Kill"}
+          </button>
+        </div>
+      </div>
+    </div>,
+    document.body,
+  );
+}

web/src/components/dialogs/index.ts

@@ -0,0 +1,3 @@
+export { KillDialog, type KillDialogProps } from "./KillDialog.js";
+export { HelpOverlay } from "./HelpOverlay.js";
+export { groupedCommands } from "./model.js";

web/src/components/dialogs/model.ts

@@ -0,0 +1,20 @@
+// Command-registry grouping for the help overlay. Moved out of help.ts (whose
+// imperative DOM overlay #253 deleted) so HelpOverlay.tsx renders the same
+// grouping the vanilla overlay did.
+
+import { publishedCommands, type Command } from "../../commands.js";
+
+/** Published commands bucketed by `group`, in registry order — the order the
+ *  overlay lists them in. */
+export function groupedCommands(): { title: string; items: Command[] }[] {
+  const groups: { title: string; items: Command[] }[] = [];
+  for (const cmd of publishedCommands()) {
+    let group = groups.find((g) => g.title === cmd.group);
+    if (!group) {
+      group = { title: cmd.group, items: [] };
+      groups.push(group);
+    }
+    group.items.push(cmd);
+  }
+  return groups;
+}

web/src/components/hooks/useViewport.test.tsx

@@ -0,0 +1,79 @@
+// @vitest-environment happy-dom
+import { cleanup, render } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { useViewport } from "./useViewport.js";
+
+function Probe() {
+  useViewport();
+  return null;
+}
+
+class FakeVisualViewport {
+  height = 800;
+  offsetTop = 0;
+  private listeners: Record<string, Array<() => void>> = { resize: [], scroll: [] };
+
+  addEventListener(type: string, cb: () => void): void {
+    this.listeners[type].push(cb);
+  }
+  removeEventListener(type: string, cb: () => void): void {
+    this.listeners[type] = this.listeners[type].filter((l) => l !== cb);
+  }
+  fire(type: "resize" | "scroll"): void {
+    for (const l of this.listeners[type]) l();
+  }
+}
+
+let vv: FakeVisualViewport;
+
+beforeEach(() => {
+  vv = new FakeVisualViewport();
+  vi.stubGlobal("visualViewport", vv);
+  vi.stubGlobal("requestAnimationFrame", (cb: FrameRequestCallback) => {
+    cb(0);
+    return 0;
+  });
+  vi.stubGlobal("cancelAnimationFrame", () => {});
+});
+
+afterEach(() => {
+  cleanup();
+  vi.unstubAllGlobals();
+  document.documentElement.className = "";
+  document.documentElement.removeAttribute("style");
+});
+
+describe("useViewport", () => {
+  it("mirrors the visual viewport's height and offset onto CSS custom properties", () => {
+    vv.height = 640;
+    vv.offsetTop = 12;
+    render(<Probe />);
+    const root = document.documentElement.style;
+    expect(root.getPropertyValue("--app-vh")).toBe("640px");
+    expect(root.getPropertyValue("--app-top")).toBe("12px");
+  });
+
+  it("no-ops when visualViewport is unavailable", () => {
+    vi.stubGlobal("visualViewport", undefined);
+    expect(() => render(<Probe />)).not.toThrow();
+    expect(document.documentElement.style.getPropertyValue("--app-vh")).toBe("");
+  });
+
+  it("marks kb-open once an editable shrinks the viewport well past the baseline", () => {
+    render(<Probe />);
+    const input = document.createElement("input");
+    document.body.appendChild(input);
+    input.focus();
+
+    vv.height = 800 - 200;
+    vv.fire("resize");
+    expect(document.documentElement.classList.contains("kb-open")).toBe(true);
+
+    input.blur();
+    vv.height = 800;
+    vv.fire("resize");
+    expect(document.documentElement.classList.contains("kb-open")).toBe(false);
+    input.remove();
+  });
+});

web/src/components/hooks/useViewport.ts

@@ -0,0 +1,51 @@
+// React port of ../../viewport.ts. Binds the app shell's height and position
+// to the *visual* viewport rather than the layout one, so a pinned bottom bar
+// (the attach view's special-key bar, NAP-342) lands above an open on-screen
+// keyboard instead of behind it. See viewport.ts for the full mechanism.
+
+import { useEffect } from "react";
+
+const KB_OPEN_THRESHOLD = 150;
+
+export function useViewport(): void {
+  useEffect(() => {
+    const vv = window.visualViewport;
+    if (!vv) return;
+
+    const root = document.documentElement;
+    let raf = 0;
+    let baseline = vv.height;
+
+    const isEditing = () => {
+      const a = document.activeElement as HTMLElement | null;
+      if (!a) return false;
+      return a.tagName === "TEXTAREA" || a.tagName === "INPUT" || a.isContentEditable;
+    };
+
+    const sync = () => {
+      raf = 0;
+      root.style.setProperty("--app-vh", `${Math.round(vv.height)}px`);
+      root.style.setProperty("--app-top", `${Math.round(vv.offsetTop)}px`);
+
+      // Nothing focused ⇒ keyboard can't be open ⇒ this height is the baseline.
+      const editing = isEditing();
+      if (!editing) baseline = vv.height;
+      const kbOpen = editing && baseline - vv.height > KB_OPEN_THRESHOLD;
+      root.classList.toggle("kb-open", kbOpen);
+    };
+    const schedule = () => {
+      if (raf) return;
+      raf = requestAnimationFrame(sync);
+    };
+
+    vv.addEventListener("resize", schedule);
+    vv.addEventListener("scroll", schedule);
+    sync();
+
+    return () => {
+      vv.removeEventListener("resize", schedule);
+      vv.removeEventListener("scroll", schedule);
+      if (raf) cancelAnimationFrame(raf);
+    };
+  }, []);
+}

web/src/components/kit/DesignKit.tsx

@@ -0,0 +1,382 @@
+// Dev-only design kit (#254), React port of the deleted kit.ts + kit.css.
+// Specimen page for the Tailwind token mapping (tailwind.config.ts ->
+// src/styles.css) so the visual system can be reviewed as a whole. Loads on
+// `?kit` (see index.tsx) and never ships to a production bundle.
+
+import { useState, type ReactNode } from "react";
+
+import { ActivityRail, STATE_WORDS } from "../sidebar/ActivityRail.js";
+import { SessionCard, type SessionCardProps } from "../sidebar/SessionCard.js";
+import { PaneTitle } from "../layout/PaneTitle.js";
+import { PALETTES, useTheme, type Palette } from "../../contexts/ThemeContext.js";
+import type { Session } from "../../types.js";
+
+/** The accent each palette lands on, read from styles.css — shown so all six
+ * are comparable at a glance without switching the live one one at a time. */
+const PALETTE_ACCENT: Record<Palette, string> = {
+  graphite: "oklch(0.92 0.005 256)",
+  "ice-cyan": "oklch(0.85 0.115 205)",
+  periwinkle: "oklch(0.75 0.125 275)",
+  "amber-phosphor": "oklch(0.85 0.16 85)",
+  ember: "oklch(0.78 0.16 40)",
+  orchid: "oklch(0.78 0.13 320)",
+};
+
+const COLOR_TOKENS = [
+  "--bg",
+  "--bg-grid",
+  "--surface",
+  "--surface-2",
+  "--surface-3",
+  "--border",
+  "--border-strong",
+  "--ink",
+  "--muted",
+  "--faint",
+  "--accent",
+  "--accent-strong",
+  "--accent-ink",
+  "--accent-tint",
+  "--accent-fill",
+  "--live",
+  "--danger",
+  "--danger-tint",
+  "--warn",
+  "--term-bg",
+] as const;
+
+// Tailwind's content scanner needs each utility to appear as a literal,
+// contiguous string in source — a template-built `w-${token}` is invisible
+// to it, so every scale below pairs the token label with its whole class name.
+const SPACING_TOKENS = [
+  { token: "sp-1", widthClass: "w-sp-1" },
+  { token: "sp-2", widthClass: "w-sp-2" },
+  { token: "sp-3", widthClass: "w-sp-3" },
+  { token: "sp-4", widthClass: "w-sp-4" },
+  { token: "sp-5", widthClass: "w-sp-5" },
+  { token: "sp-6", widthClass: "w-sp-6" },
+  { token: "sp-8", widthClass: "w-sp-8" },
+] as const;
+const RADIUS_TOKENS = [
+  { token: "r-1", radiusClass: "rounded-r-1" },
+  { token: "r-2", radiusClass: "rounded-r-2" },
+  { token: "r-3", radiusClass: "rounded-r-3" },
+  { token: "r-pill", radiusClass: "rounded-r-pill" },
+] as const;
+const FONT_SIZE_TOKENS = [
+  { token: "fs-11", sizeClass: "text-fs-11" },
+  { token: "fs-12", sizeClass: "text-fs-12" },
+  { token: "fs-13", sizeClass: "text-fs-13" },
+  { token: "fs-14", sizeClass: "text-fs-14" },
+  { token: "fs-15", sizeClass: "text-fs-15" },
+  { token: "fs-17", sizeClass: "text-fs-17" },
+  { token: "fs-20", sizeClass: "text-fs-20" },
+] as const;
+const Z_INDEX_TOKENS = [
+  { name: "z-sticky", value: 10 },
+  { name: "z-backdrop", value: 40 },
+  { name: "z-modal", value: 50 },
+  { name: "z-toast", value: 60 },
+] as const;
+
+function Section({
+  title,
+  note,
+  children,
+}: {
+  title: string;
+  note?: string;
+  children: ReactNode;
+}) {
+  return (
+    <section className="border-t border-border py-sp-6 first:border-t-0 first:pt-0">
+      <h2 className="text-fs-17 font-semibold text-ink">{title}</h2>
+      {note && <p className="mt-sp-1 max-w-[70ch] text-fs-12 text-muted">{note}</p>}
+      <div className="mt-sp-4 flex flex-wrap gap-sp-4">{children}</div>
+    </section>
+  );
+}
+
+function Specimen({ label, children }: { label: string; children: React.ReactNode }) {
+  return (
+    <div className="flex flex-col items-start gap-sp-2">
+      <div className="flex min-h-[48px] items-center rounded-r-2 border border-border bg-surface p-sp-3">
+        {children}
+      </div>
+      <span className="font-mono text-fs-11 text-faint">{label}</span>
+    </div>
+  );
+}
+
+function fakeSession(overrides: Partial<Session>): Session {
+  return {
+    id: "00000000-0000-0000-0000-000000000000",
+    cwd: "/home/dev/maestro",
+    command: "claude",
+    env: {},
+    metadata: {},
+    status: "Running",
+    created_at: new Date().toISOString(),
+    activity_since: new Date(Date.now() - 4 * 60_000).toISOString(),
+    ...overrides,
+  };
+}
+
+const NOOP_CARD_HANDLERS: Omit<SessionCardProps, "session" | "depth" | "now" | "highlighted" | "active" | "open" | "previewing" | "renaming"> = {
+  onSelect: () => {},
+  onOpenMenu: () => {},
+  onSpawnSimilar: () => {},
+  onKill: () => {},
+  onRenameCommit: () => {},
+  onRenameCancel: () => {},
+};
+
+const CARD_SPECIMENS: Array<{ label: string; props: Omit<SessionCardProps, keyof typeof NOOP_CARD_HANDLERS> }> = [
+  {
+    label: "idle",
+    props: {
+      session: fakeSession({ command: "bash" }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: false,
+      open: false,
+      previewing: false,
+      renaming: false,
+    },
+  },
+  {
+    label: "active, focused",
+    props: {
+      session: fakeSession({ activity: "Active", command: "vite dev" }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: true,
+      open: true,
+      previewing: false,
+      renaming: false,
+    },
+  },
+  {
+    label: "awaiting-input",
+    props: {
+      session: fakeSession({ activity: "AwaitingInput", activity_since: new Date(Date.now() - 12_000).toISOString() }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: false,
+      open: false,
+      previewing: false,
+      renaming: false,
+    },
+  },
+  {
+    label: "error",
+    props: {
+      session: fakeSession({ activity: "Error", activity_detail: "tests failing", activity_since: new Date(Date.now() - 7_200_000).toISOString() }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: false,
+      open: false,
+      previewing: false,
+      renaming: false,
+    },
+  },
+  {
+    label: "previewing",
+    props: {
+      session: fakeSession({ command: "opencode" }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: false,
+      open: false,
+      previewing: true,
+      renaming: false,
+    },
+  },
+  {
+    label: "exited",
+    props: {
+      session: fakeSession({ status: "Dead", command: "btop" }),
+      depth: 0,
+      now: Date.now(),
+      highlighted: false,
+      active: false,
+      open: false,
+      previewing: false,
+      renaming: false,
+    },
+  },
+];
+
+const ACTIVITY_STATES = Object.keys(STATE_WORDS) as Array<keyof typeof STATE_WORDS>;
+
+export function DesignKit() {
+  const { theme, palette, toggleTheme, setPalette } = useTheme();
+  // "open" is deliberately display:none in the real app (.mv-pane's rule,
+  // styles.css) — a streaming pane already shows it's connected — so start on
+  // a state the kit page can actually show.
+  const [attachState, setAttachState] = useState<"connecting" | "open" | "closed">("connecting");
+
+  return (
+    // #root is a fixed-height, overflow-hidden flex column (main.css) built for
+    // the app shell's own internal scrolling — this page needs its own scroll
+    // container to match, or everything past the first viewport is clipped.
+    <div className="h-full overflow-y-auto bg-bg text-ink">
+      <header className="flex items-center justify-between border-b border-border px-sp-4 py-sp-3">
+        <h1 className="text-fs-20 font-semibold">
+          maestro<span className="text-accent">_</span> · design kit
+        </h1>
+        <div className="flex items-center gap-sp-2">
+          <button type="button" className="btn btn-ghost" onClick={toggleTheme}>
+            {theme === "dark" ? "☀ light" : "☾ dark"}
+          </button>
+        </div>
+      </header>
+
+      <main className="mx-auto max-w-5xl px-sp-4 py-sp-4">
+        <Section
+          title="Colour palettes"
+          note="6 palettes, picked via data-palette on <html> through ThemeContext. Switching one recolours every token below live."
+        >
+          {PALETTES.map((p) => (
+            <button
+              key={p}
+              type="button"
+              onClick={() => setPalette(p)}
+              className={`flex flex-col items-center gap-sp-1 rounded-r-2 border p-sp-2 ${
+                p === palette ? "border-accent" : "border-border"
+              }`}
+            >
+              <span
+                className="h-sp-6 w-sp-8 rounded-r-1"
+                style={{ background: PALETTE_ACCENT[p] }}
+              />
+              <span className="font-mono text-fs-11 text-muted">{p}</span>
+            </button>
+          ))}
+        </Section>
+
+        <Section title="Colour tokens" note="Current palette + theme, applied through var(--token).">
+          {COLOR_TOKENS.map((t) => (
+            <div key={t} className="flex flex-col items-start gap-sp-1">
+              <div
+                className="h-sp-8 w-sp-8 rounded-r-2 border border-border"
+                style={{ background: `var(${t})` }}
+              />
+              <span className="font-mono text-fs-11 text-faint">{t}</span>
+            </div>
+          ))}
+        </Section>
+
+        <Section title="Typography" note="fontSize -> var(--fs-N), from tailwind.config.ts.">
+          {FONT_SIZE_TOKENS.map(({ token, sizeClass }) => (
+            <Specimen key={token} label={token}>
+              <span className={`font-mono ${sizeClass}`}>Sessions</span>
+            </Specimen>
+          ))}
+        </Section>
+
+        <Section title="Spacing scale" note="spacing -> var(--sp-N).">
+          {SPACING_TOKENS.map(({ token, widthClass }) => (
+            <div key={token} className="flex flex-col items-start gap-sp-1">
+              <div className={`h-sp-3 bg-accent ${widthClass}`} />
+              <span className="font-mono text-fs-11 text-faint">{token}</span>
+            </div>
+          ))}
+        </Section>
+
+        <Section title="Border radii" note="borderRadius -> var(--r-N).">
+          {RADIUS_TOKENS.map(({ token, radiusClass }) => (
+            <div key={token} className="flex flex-col items-start gap-sp-1">
+              <div className={`h-sp-6 w-sp-8 border-2 border-accent ${radiusClass}`} />
+              <span className="font-mono text-fs-11 text-faint">{token}</span>
+            </div>
+          ))}
+        </Section>
+
+        <Section title="Z-index scale" note="zIndex -> var(--z-*).">
+          {Z_INDEX_TOKENS.map((z) => (
+            <div key={z.name} className="flex items-baseline gap-sp-2 font-mono text-fs-12">
+              <span className="text-muted">{z.name}</span>
+              <span className="text-ink">{z.value}</span>
+            </div>
+          ))}
+        </Section>
+
+        <Section title="Buttons" note="Terminal-native bracket chrome — .btn / .btn-primary / .btn-ghost / .btn-icon / .btn-danger.">
+          <Specimen label="btn">
+            <button type="button" className="btn">Cancel</button>
+          </Specimen>
+          <Specimen label="btn-primary">
+            <button type="button" className="btn btn-primary">+ Spawn</button>
+          </Specimen>
+          <Specimen label="btn-ghost">
+            <button type="button" className="btn btn-ghost">Dismiss</button>
+          </Specimen>
+          <Specimen label="btn-icon">
+            <button type="button" className="btn btn-icon">✕</button>
+          </Specimen>
+          <Specimen label="btn-danger">
+            <button type="button" className="btn btn-danger">Kill</button>
+          </Specimen>
+          <Specimen label="btn:disabled">
+            <button type="button" className="btn btn-primary" disabled>+ Spawn</button>
+          </Specimen>
+        </Section>
+
+        <Section title="Activity rail" note="ActivityRail.tsx — one state per session card, colour-coded and never colour-only (title/aria-label carry the word).">
+          {ACTIVITY_STATES.map((slug) => (
+            <Specimen key={slug} label={`${slug} · ${STATE_WORDS[slug]}`}>
+              <div className="relative h-[32px] w-[24px] overflow-hidden rounded-r-1 bg-surface-2">
+                <ActivityRail activity={slug} />
+              </div>
+            </Specimen>
+          ))}
+        </Section>
+
+        <Section title="Session cards" note="SessionCard.tsx, docs/SIDEBAR.md states.">
+          <div className="w-full max-w-sm divide-y divide-border rounded-r-2 border border-border bg-surface-2">
+            {CARD_SPECIMENS.map(({ label, props }) => (
+              <div key={label} className="relative">
+                <SessionCard {...props} {...NOOP_CARD_HANDLERS} />
+              </div>
+            ))}
+          </div>
+        </Section>
+
+        <Section title="Terminal chrome" note="attach-header + attach-body, as worn by TerminalPane/StructuredPane.">
+          <div className="w-full max-w-lg overflow-hidden rounded-r-2 border border-border">
+            <div className="attach-header">
+              <PaneTitle
+                sessionId="11111111-2222-3333-4444-555555555555"
+                session={fakeSession({ command: "claude" })}
+              />
+              <span className="flex-1" />
+              <button
+                type="button"
+                className="attach-state"
+                data-state={attachState}
+                onClick={() =>
+                  setAttachState((s) => (s === "open" ? "connecting" : s === "connecting" ? "closed" : "open"))
+                }
+                title="Click to cycle"
+              >
+                {attachState}
+              </button>
+              <button type="button" className="btn btn-icon disconnect" title="Disconnect">
+                ⏻
+              </button>
+            </div>
+            <div className="attach-body h-[120px] items-start">
+              <span className="font-mono text-fs-13 text-muted">$ pnpm test</span>
+            </div>
+          </div>
+        </Section>
+      </main>
+    </div>
+  );
+}

web/src/components/layout/Drawer.test.tsx

@@ -0,0 +1,154 @@
+// @vitest-environment happy-dom
+import { act, cleanup, fireEvent, render } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { OPEN_SPAWN_EVENT, SPAWN_SIMILAR_EVENT } from "../../uiEvents.js";
+import { TOGGLE_DRAWER_EVENT } from "../../uiEvents.js";
+import { Drawer } from "./Drawer.js";
+
+/** Force the mobile media query on, whatever happy-dom's viewport says
+ *  (mirrors ../layout/MultiView's own `forceMobile` in multiview.test.ts). */
+function forceMobile(matches: boolean): void {
+  vi.spyOn(window, "matchMedia").mockImplementation(
+    (query: string) =>
+      ({
+        matches: query.includes("859") && matches,
+        media: query,
+        onchange: null,
+        addEventListener() {},
+        removeEventListener() {},
+        addListener() {},
+        removeListener() {},
+        dispatchEvent: () => false,
+      }) as unknown as MediaQueryList,
+  );
+}
+
+function shell(): HTMLElement {
+  return document.querySelector(".app-shell") as HTMLElement;
+}
+
+function touch(type: "touchstart" | "touchend", x: number, y: number): void {
+  const touches = [{ clientX: x, clientY: y }];
+  const event = new Event(type, { bubbles: true }) as unknown as {
+    touches: typeof touches;
+    changedTouches: typeof touches;
+  };
+  event.touches = touches;
+  event.changedTouches = touches;
+  act(() => {
+    document.dispatchEvent(event as unknown as Event);
+  });
+}
+
+beforeEach(() => forceMobile(true));
+
+afterEach(() => {
+  cleanup();
+  vi.restoreAllMocks();
+});
+
+function openViaToggle(): void {
+  act(() => {
+    document.dispatchEvent(new CustomEvent(TOGGLE_DRAWER_EVENT));
+  });
+}
+
+describe("Drawer (#35)", () => {
+  it("toggles open on the toggle event, off on desktop by class alone", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+    openViaToggle();
+    expect(shell().classList.contains("drawer-open")).toBe(true);
+  });
+
+  it("closes when a session row is tapped", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    openViaToggle();
+    fireEvent.click(document.querySelector(".tree-leaf") as HTMLElement);
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("closes when a spawn is requested", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    openViaToggle();
+    act(() => {
+      document.dispatchEvent(new CustomEvent(OPEN_SPAWN_EVENT));
+    });
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("closes when spawn similar is requested", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    openViaToggle();
+    act(() => {
+      document.dispatchEvent(new CustomEvent(SPAWN_SIMILAR_EVENT, { detail: {} }));
+    });
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("closes on a backdrop click", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    openViaToggle();
+    fireEvent.click(document.querySelector(".mv-backdrop") as HTMLElement);
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("opens on a rightward swipe and closes on a leftward one, only on mobile", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    touch("touchstart", 0, 100);
+    touch("touchend", 100, 100);
+    expect(shell().classList.contains("drawer-open")).toBe(true);
+
+    touch("touchstart", 100, 100);
+    touch("touchend", 0, 100);
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("ignores swipes on desktop", () => {
+    forceMobile(false);
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    touch("touchstart", 0, 100);
+    touch("touchend", 100, 100);
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+
+  it("ignores a mostly-vertical or too-short gesture", () => {
+    render(
+      <Drawer sidebar={<div className="tree-leaf">row</div>}>
+        <div>content</div>
+      </Drawer>,
+    );
+    touch("touchstart", 0, 0);
+    touch("touchend", 10, 100);
+    expect(shell().classList.contains("drawer-open")).toBe(false);
+  });
+});

web/src/components/layout/Drawer.tsx

@@ -0,0 +1,92 @@
+// React port of ../../drawer.ts (#35): the mobile off-canvas sidebar. On
+// desktop the `drawer-open` class is inert — CSS gates the drawer styling to
+// narrow viewports (styles.css, `.app-shell`).
+//
+// Anything that puts a new view in the content area must close the drawer, or
+// it renders behind the sidebar and the tap reads as a dead button — this
+// listens for the same TOGGLE_DRAWER_EVENT/OPEN_SPAWN_EVENT/SPAWN_SIMILAR_EVENT
+// the rest of the shell already raises, so it needs no wiring from callers.
+
+import type { ReactNode } from "react";
+import { useEffect, useRef, useState } from "react";
+
+import { OPEN_SPAWN_EVENT, SPAWN_SIMILAR_EVENT, TOGGLE_DRAWER_EVENT } from "../../uiEvents.js";
+
+export interface DrawerProps {
+  sidebar: ReactNode;
+  children: ReactNode;
+  className?: string;
+}
+
+export function Drawer({ sidebar, children, className }: DrawerProps) {
+  const [open, setOpen] = useState(false);
+  const sidebarRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const onToggle = () => setOpen((o) => !o);
+    const onClose = () => setOpen(false);
+    document.addEventListener(TOGGLE_DRAWER_EVENT, onToggle);
+    document.addEventListener(OPEN_SPAWN_EVENT, onClose);
+    document.addEventListener(SPAWN_SIMILAR_EVENT, onClose);
+    return () => {
+      document.removeEventListener(TOGGLE_DRAWER_EVENT, onToggle);
+      document.removeEventListener(OPEN_SPAWN_EVENT, onClose);
+      document.removeEventListener(SPAWN_SIMILAR_EVENT, onClose);
+    };
+  }, []);
+
+  // Horizontal swipes drive the drawer (right opens, left closes) rather than
+  // the browser's back/forward navigation. Only a clearly horizontal gesture
+  // past a threshold counts, so vertical terminal scrolling (which owns its
+  // own touch handler) is untouched.
+  useEffect(() => {
+    const mobileMq = window.matchMedia("(max-width: 859px)");
+    let sx = 0;
+    let sy = 0;
+    let tracking = false;
+
+    const onTouchStart = (e: TouchEvent) => {
+      tracking = mobileMq.matches && e.touches.length === 1;
+      if (tracking) {
+        sx = e.touches[0].clientX;
+        sy = e.touches[0].clientY;
+      }
+    };
+    const onTouchEnd = (e: TouchEvent) => {
+      if (!tracking) return;
+      tracking = false;
+      const t = e.changedTouches[0];
+      const dx = t.clientX - sx;
+      const dy = t.clientY - sy;
+      if (Math.abs(dx) < 60 || Math.abs(dx) < Math.abs(dy) * 1.5) return;
+      setOpen((o) => {
+        if (dx > 0 && !o) return true;
+        if (dx < 0 && o) return false;
+        return o;
+      });
+    };
+
+    document.addEventListener("touchstart", onTouchStart, { passive: true });
+    document.addEventListener("touchend", onTouchEnd, { passive: true });
+    return () => {
+      document.removeEventListener("touchstart", onTouchStart);
+      document.removeEventListener("touchend", onTouchEnd);
+    };
+  }, []);
+
+  return (
+    <div className={`app-shell flex h-full min-h-0 ${open ? "drawer-open" : ""} ${className ?? ""}`}>
+      <div
+        ref={sidebarRef}
+        className="sidebar flex h-full min-h-0 flex-col bg-surface"
+        onClick={(e) => {
+          if ((e.target as HTMLElement).closest(".tree-leaf")) setOpen(false);
+        }}
+      >
+        {sidebar}
+      </div>
+      <section className="content min-h-0 flex-1">{children}</section>
+      <div className="mv-backdrop" onClick={() => setOpen(false)} />
+    </div>
+  );
+}

web/src/components/layout/MultiView.test.tsx

@@ -0,0 +1,152 @@
+// @vitest-environment happy-dom
+import { act, cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { leaves } from "../../layout.js";
+import { createLayoutStore } from "../../stores/layoutStore.js";
+import type { Session } from "../../types.js";
+import { MultiView } from "./MultiView.js";
+
+vi.mock("../terminal/TerminalPane.js", () => ({
+  TerminalPane: ({ sessionId }: { sessionId: string }) => <div data-testid={`terminal-${sessionId}`} />,
+}));
+
+vi.mock("../structured/StructuredPane.js", () => ({
+  StructuredPane: ({ sessionId }: { sessionId: string }) => <div data-testid={`structured-${sessionId}`} />,
+}));
+
+afterEach(cleanup);
+
+function store() {
+  return createLayoutStore({
+    load: () => null,
+    save: vi.fn(),
+    scheduler: { setTimer: () => 1, clearTimer: () => {} },
+  });
+}
+
+function session(id: string, over: Partial<Session> = {}): Session {
+  return {
+    id,
+    cwd: "/home/n",
+    command: "claude",
+    env: {},
+    metadata: {},
+    status: "Running",
+    created_at: "2026-01-01T00:00:00Z",
+    ...over,
+  } as Session;
+}
+
+describe("MultiView", () => {
+  it("shows the empty state when the active tab has no panes", () => {
+    const s = store();
+    render(<MultiView store={s} />);
+    expect(screen.getByText(/No session open/)).toBeTruthy();
+  });
+
+  it("renders a pane per leaf, dispatching to the terminal or structured body", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    s.getState().openSessionBeside("s2");
+    const sessions = new Map([
+      ["s1", session("s1")],
+      ["s2", session("s2", { view: "Structured" })],
+    ]);
+    render(<MultiView store={s} sessions={sessions} />);
+    expect(screen.getByTestId("terminal-s1")).toBeTruthy();
+    expect(screen.getByTestId("structured-s2")).toBeTruthy();
+  });
+
+  it("split right adds a second pane to the tree", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+    fireEvent.click(screen.getByTitle("Split right"));
+    expect(screen.getAllByText("Empty pane")).toHaveLength(1);
+  });
+
+  it("close pane removes it", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    const leafId = leaves(s.getState().layout.tabs[0].root)[0].id;
+    s.getState().splitFocused(leafId, "row"); // adds an empty leaf beside s1
+    render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+    // splitFocused(after: true) puts the fresh empty leaf second — close it.
+    fireEvent.click(screen.getAllByTitle("Close pane")[1]);
+    expect(screen.queryByText("Empty pane")).toBeNull();
+    expect(screen.getByTestId("terminal-s1")).toBeTruthy();
+  });
+
+  it("prunes a leaf whose session no longer exists, once the live set is known", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    s.getState().openSessionBeside("dead");
+    render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+    expect(screen.getByTestId("terminal-s1")).toBeTruthy();
+    expect(screen.queryByTestId("terminal-dead")).toBeNull();
+  });
+
+  it("does not touch the layout while the live set is still unknown", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    render(<MultiView store={s} />);
+    expect(screen.getByTestId("terminal-s1")).toBeTruthy();
+  });
+
+  describe("preview mode (docs/PREVIEW.md)", () => {
+    it("shows a session no pane holds in a throwaway tab, marked as a preview", () => {
+      const s = store();
+      s.getState().openSession("s1");
+      render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+
+      act(() => s.getState().previewSession("s9"));
+      // s1's own tab is still in the strip — the preview never touched it.
+      expect(screen.getByText("Tab 1 · 1")).toBeTruthy();
+      const pane = document.querySelector('[data-session-id="s9"]');
+      expect(pane).toBeTruthy();
+      expect(pane!.querySelector(".bg-preview-tint")).toBeTruthy();
+      expect(screen.getByText("preview")).toBeTruthy();
+    });
+
+    it("puts the layout back byte for byte once the preview ends", () => {
+      const s = store();
+      s.getState().openSession("s1");
+      render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+      const before = JSON.stringify(s.getState().layout);
+
+      act(() => s.getState().previewSession("s9"));
+      act(() => s.getState().previewSession(null));
+
+      expect(JSON.stringify(s.getState().layout)).toBe(before);
+      expect(screen.queryByText("preview")).toBeNull();
+    });
+
+    it("does not grab the keyboard while previewing", () => {
+      const s = store();
+      s.getState().openSession("s1");
+      render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+
+      act(() => s.getState().previewSession("s9"));
+      const pane = document.querySelector('[data-session-id="s9"]') as HTMLElement;
+      expect(pane.querySelector('[data-testid="terminal-s9"]')).toBeTruthy();
+      // TerminalPane's `focus` prop is verified by TerminalPane's own tests;
+      // here the preview must never end up as the active-tab's accent pane.
+      expect(pane.className).not.toContain("border-accent");
+    });
+
+    it("clicking into a previewed pane commits it: no more preview, nothing moves a second time", () => {
+      const s = store();
+      s.getState().openSession("s1");
+      render(<MultiView store={s} sessions={new Map([["s1", session("s1")]])} />);
+
+      act(() => s.getState().previewSession("s9"));
+      const pane = document.querySelector('[data-session-id="s9"]') as HTMLElement;
+      fireEvent.pointerDown(pane);
+
+      expect(s.getState().preview).toBeNull();
+      expect(screen.queryByText("preview")).toBeNull();
+      expect(leaves(s.getState().layout.tabs[1].root).map((l) => l.sessionId)).toEqual(["s9"]);
+    });
+  });
+});

web/src/components/layout/MultiView.tsx

@@ -0,0 +1,271 @@
+// React port of multiview.ts's tab + split tree (issue #249) plus its preview
+// mode (issue #251, docs/PREVIEW.md). Sidebar drag-to-dock and the mobile
+// single-pane collapse stay with whichever issue wires this into the shell
+// (#253) — this renders the tree itself: tabs, nested splits, pane chrome.
+
+import type { ReactNode } from "react";
+import { forwardRef, useEffect, useImperativeHandle, useRef } from "react";
+import { useStore } from "zustand";
+
+import { activeTab, type Dir, type Node } from "../../layout.js";
+import { usePreview } from "../../hooks/usePreview.js";
+import type { LayoutStore, LayoutStoreApi } from "../../stores/layoutStore.js";
+import type { Session, Uuid } from "../../types.js";
+import { PaneContainer, type PaneContainerHandle } from "./PaneContainer.js";
+import { PaneTitle } from "./PaneTitle.js";
+import { TabBar } from "./TabBar.js";
+
+/** Reaching the focused pane from outside the tree — what the shell's
+ *  leader chords need (focus.toggle, the literal-byte escape hatches). */
+export interface MultiViewHandle {
+  /** Hand the keyboard to the focused pane's terminal (or composer). */
+  focusPane(): void;
+  /** Type into the focused pane. A structured pane has no PTY and ignores it. */
+  sendInput(data: string): void;
+}
+
+export interface MultiViewProps {
+  store: LayoutStoreApi;
+  /** Live sessions, keyed by id — drives pane titles and (once known) boot
+   *  reconciliation. Passing `undefined` defers reconciliation. */
+  sessions?: ReadonlyMap<Uuid, Session>;
+  onDisconnect?: (sessionId: Uuid) => void;
+  emptyState?: ReactNode;
+}
+
+export const MultiView = forwardRef<MultiViewHandle, MultiViewProps>(function MultiView(
+  { store, sessions, onDisconnect, emptyState },
+  ref,
+) {
+  const layout = useStore(store, (s: LayoutStore) => s.layout);
+  const tab = activeTab(layout);
+
+  // Live pane handles, keyed by leaf. Read at call time (not render time) so
+  // the chords always reach whatever is focused right now.
+  const panes = useRef(new Map<string, PaneContainerHandle>()).current;
+  const focusedLeafRef = useRef<string | null>(null);
+  focusedLeafRef.current = tab.focusedLeafId;
+  useImperativeHandle(
+    ref,
+    () => ({
+      focusPane: () => panes.get(focusedLeafRef.current ?? "")?.focusTerminal(),
+      sendInput: (data: string) => panes.get(focusedLeafRef.current ?? "")?.sendInput(data),
+    }),
+    [panes],
+  );
+  const { previewedSessionId, commit: commitPreview } = usePreview({ store });
+  const isPreviewing = previewedSessionId !== null;
+
+  const reconciledRef = useRef(false);
+  useEffect(() => {
+    if (reconciledRef.current || !sessions) return;
+    reconciledRef.current = true;
+    store.getState().reconcile(new Set(sessions.keys()));
+  }, [sessions, store]);
+
+  return (
+    <div className="mv flex h-full min-h-0 flex-col">
+      <TabBar store={store} />
+      <div className="mv-canvas relative min-h-0 flex-1">
+        {tab.root ? (
+          <SplitNode
+            node={tab.root}
+            tab={tab}
+            panes={panes}
+            store={store}
+            sessions={sessions}
+            onDisconnect={onDisconnect}
+            previewedSessionId={previewedSessionId}
+            commitPreview={commitPreview}
+          />
+        ) : (
+          (emptyState ?? (
+            <div className="mv-empty flex h-full items-center justify-center p-sp-4 text-fs-13 text-faint">
+              No session open — pick one from the sidebar, or spawn a new one.
+            </div>
+          ))
+        )}
+        {isPreviewing && (
+          <>
+            <div className="mv-preview-ring pointer-events-none absolute inset-0 rounded-r-2 border border-dashed border-preview-ring" />
+            <div className="mv-preview-chip pointer-events-none absolute right-sp-2 top-sp-2 z-sticky rounded-r-pill bg-preview px-sp-2 py-[2px] text-fs-11 text-preview-ink">
+              preview
+            </div>
+          </>
+        )}
+      </div>
+    </div>
+  );
+});
+
+interface TreeProps {
+  tab: { id: string; focusedLeafId: string | null };
+  /** Pane handles by leaf id — each `Pane` registers and unregisters its own. */
+  panes: Map<string, PaneContainerHandle>;
+  store: LayoutStoreApi;
+  sessions?: ReadonlyMap<Uuid, Session>;
+  onDisconnect?: (sessionId: Uuid) => void;
+  previewedSessionId: Uuid | null;
+  commitPreview: (sessionId: Uuid) => void;
+}
+
+function SplitNode({ node, ...rest }: TreeProps & { node: Node }) {
+  if (node.kind === "leaf") {
+    return <Pane leaf={node} isFocused={rest.tab.focusedLeafId === node.id} {...rest} />;
+  }
+  return <SplitContainer node={node} {...rest} />;
+}
+
+function SplitContainer({ node, ...rest }: TreeProps & { node: Extract<Node, { kind: "split" }> }) {
+  const slotA = useRef<HTMLDivElement | null>(null);
+  const slotB = useRef<HTMLDivElement | null>(null);
+  const containerRef = useRef<HTMLDivElement | null>(null);
+
+  const onDividerPointerDown = (e: React.PointerEvent<HTMLDivElement>) => {
+    e.preventDefault();
+    const divider = e.currentTarget;
+    const container = containerRef.current;
+    if (!container) return;
+    divider.setPointerCapture(e.pointerId);
+    const rect = container.getBoundingClientRect();
+    const move = (ev: PointerEvent) => {
+      const frac =
+        node.dir === "row" ? (ev.clientX - rect.left) / rect.width : (ev.clientY - rect.top) / rect.height;
+      node.ratio = Math.max(0.1, Math.min(0.9, frac));
+      if (slotA.current) slotA.current.style.flexGrow = String(node.ratio);
+      if (slotB.current) slotB.current.style.flexGrow = String(1 - node.ratio);
+    };
+    const up = (ev: PointerEvent) => {
+      try {
+        divider.releasePointerCapture(ev.pointerId);
+      } catch {
+        // already released
+      }
+      divider.removeEventListener("pointermove", move);
+      divider.removeEventListener("pointerup", up);
+      rest.store.getState().commitLayout();
+    };
+    divider.addEventListener("pointermove", move);
+    divider.addEventListener("pointerup", up);
+  };
+
+  return (
+    <div
+      ref={containerRef}
+      className={`mv-split flex h-full min-h-0 w-full ${node.dir === "row" ? "flex-row" : "flex-col"}`}
+    >
+      <div ref={slotA} className="mv-slot min-h-0 min-w-0" style={{ flex: `${node.ratio} 1 0` }}>
+        <SplitNode node={node.a} {...rest} />
+      </div>
+      <div
+        className={
+          "mv-divider flex-none bg-border-strong hover:bg-accent " +
+          (node.dir === "row" ? "w-[3px] cursor-col-resize" : "h-[3px] cursor-row-resize")
+        }
+        onPointerDown={onDividerPointerDown}
+      />
+      <div ref={slotB} className="mv-slot min-h-0 min-w-0" style={{ flex: `${1 - node.ratio} 1 0` }}>
+        <SplitNode node={node.b} {...rest} />
+      </div>
+    </div>
+  );
+}
+
+function Pane({
+  leaf,
+  isFocused,
+  panes,
+  store,
+  sessions,
+  onDisconnect,
+  previewedSessionId,
+  commitPreview,
+}: TreeProps & { leaf: Extract<Node, { kind: "leaf" }>; isFocused: boolean }) {
+  const session = leaf.sessionId ? sessions?.get(leaf.sessionId) : undefined;
+  const isPreview = leaf.sessionId !== null && leaf.sessionId === previewedSessionId;
+  const splitFocused = (dir: Dir) => store.getState().splitFocused(leaf.id, dir);
+
+  return (
+    <div
+      className={
+        "mv-pane flex h-full min-h-0 min-w-0 flex-col border " +
+        (isFocused && !isPreview ? "border-accent" : "border-border-strong")
+      }
+      data-leaf-id={leaf.id}
+      data-session-id={leaf.sessionId ?? undefined}
+      onPointerDownCapture={() => {
+        // Clicking into a previewed pane is the operator choosing it
+        // (docs/PREVIEW.md).
+        if (isPreview) commitPreview(leaf.sessionId!);
+        store.getState().focusLeaf(leaf.id);
+      }}
+    >
+      <div
+        className={
+          "mv-pane-header flex items-center justify-between gap-sp-2 border-b border-border-strong px-sp-2 py-sp-1 text-fs-12 " +
+          (isPreview ? "bg-preview-tint text-preview" : "bg-surface")
+        }
+      >
+        {leaf.sessionId ? (
+          <PaneTitle sessionId={leaf.sessionId} session={session} />
+        ) : (
+          <span className="text-faint">Empty pane</span>
+        )}
+        <div className="mv-pane-tools flex items-center gap-sp-1">
+          {leaf.sessionId && onDisconnect && (
+            <button
+              type="button"
+              className="mv-tool rounded-r-1 px-sp-1 text-faint hover:bg-surface-3 hover:text-ink"
+              title="Disconnect"
+              onClick={() => onDisconnect(leaf.sessionId!)}
+            >
+              ⏻
+            </button>
+          )}
+          <button
+            type="button"
+            className="mv-tool rounded-r-1 px-sp-1 text-faint hover:bg-surface-3 hover:text-ink"
+            title="Split right"
+            onClick={() => splitFocused("row")}
+          >
+            ▥
+          </button>
+          <button
+            type="button"
+            className="mv-tool rounded-r-1 px-sp-1 text-faint hover:bg-surface-3 hover:text-ink"
+            title="Split down"
+            onClick={() => splitFocused("col")}
+          >
+            ▤
+          </button>
+          <button
+            type="button"
+            className="mv-tool rounded-r-1 px-sp-1 text-faint hover:bg-surface-3 hover:text-ink"
+            title="Close pane"
+            onClick={() => store.getState().closePane(leaf.id)}
+          >
+            ✕
+          </button>
+        </div>
+      </div>
+      <div className="mv-pane-host min-h-0 flex-1">
+        {leaf.sessionId ? (
+          <PaneContainer
+            ref={(handle) => {
+              if (handle) panes.set(leaf.id, handle);
+              else panes.delete(leaf.id);
+            }}
+            sessionId={leaf.sessionId}
+            session={session}
+            focus={isFocused && previewedSessionId === null}
+            onClosed={() => store.getState().closeSession(leaf.sessionId!)}
+          />
+        ) : (
+          <div className="mv-pane-empty flex h-full items-center justify-center p-sp-4 text-fs-13 text-faint">
+            Empty pane — pick a session from the sidebar, or spawn one.
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

web/src/components/layout/PaneContainer.test.tsx

@@ -0,0 +1,54 @@
+// @vitest-environment happy-dom
+import { cleanup, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import type { Session } from "../../types.js";
+import { PaneContainer } from "./PaneContainer.js";
+
+vi.mock("../terminal/TerminalPane.js", () => ({
+  TerminalPane: ({ sessionId, focus }: { sessionId: string; focus?: boolean }) => (
+    <div data-testid="terminal-pane" data-session-id={sessionId} data-focus={String(focus)} />
+  ),
+}));
+
+vi.mock("../structured/StructuredPane.js", () => ({
+  StructuredPane: ({ sessionId, focus }: { sessionId: string; focus?: boolean }) => (
+    <div data-testid="structured-pane" data-session-id={sessionId} data-focus={String(focus)} />
+  ),
+}));
+
+afterEach(cleanup);
+
+function session(over: Partial<Session> = {}): Session {
+  return {
+    id: "s1",
+    cwd: "/home/n",
+    command: "claude",
+    env: {},
+    metadata: {},
+    status: "Running",
+    created_at: "2026-01-01T00:00:00Z",
+    ...over,
+  } as Session;
+}
+
+describe("PaneContainer", () => {
+  it("renders TerminalPane when the session has no view (defaults to Terminal)", () => {
+    render(<PaneContainer sessionId="s1" session={session()} />);
+    expect(screen.getByTestId("terminal-pane")).toBeTruthy();
+    expect(screen.queryByTestId("structured-pane")).toBeNull();
+  });
+
+  it("renders TerminalPane when the session isn't known yet", () => {
+    render(<PaneContainer sessionId="s1" />);
+    expect(screen.getByTestId("terminal-pane")).toBeTruthy();
+  });
+
+  it("renders StructuredPane for a Structured session", () => {
+    render(<PaneContainer sessionId="s1" session={session({ view: "Structured" })} focus={false} />);
+    const pane = screen.getByTestId("structured-pane");
+    expect(pane.dataset.sessionId).toBe("s1");
+    expect(pane.dataset.focus).toBe("false");
+    expect(screen.queryByTestId("terminal-pane")).toBeNull();
+  });
+});

web/src/components/layout/PaneContainer.tsx

@@ -0,0 +1,49 @@
+// Dispatches a leaf's session to the right body — TerminalPane for a PTY
+// session, StructuredPane for an ACP one (session.view, #133/#140/#249).
+
+import { forwardRef, useImperativeHandle, useRef } from "react";
+
+import type { Session, Uuid } from "../../types.js";
+import { StructuredPane, type StructuredPaneHandle } from "../structured/StructuredPane.js";
+import { TerminalPane, type TerminalPaneHandle } from "../terminal/TerminalPane.js";
+
+export interface PaneContainerHandle {
+  focusTerminal(): void;
+  /** No-op for a structured pane — it has no PTY (pane.ts's PaneConnection contract). */
+  sendInput(data: string): void;
+}
+
+export interface PaneContainerProps {
+  sessionId: Uuid;
+  session?: Session;
+  /** Grabs the keyboard once connected. A sidebar preview passes `false`. */
+  focus?: boolean;
+  onClosed?: () => void;
+  className?: string;
+}
+
+export const PaneContainer = forwardRef<PaneContainerHandle, PaneContainerProps>(function PaneContainer(
+  { sessionId, session, focus, onClosed, className },
+  ref,
+) {
+  const terminalRef = useRef<TerminalPaneHandle>(null);
+  const structuredRef = useRef<StructuredPaneHandle>(null);
+
+  useImperativeHandle(
+    ref,
+    () => ({
+      focusTerminal: () => {
+        terminalRef.current?.focusTerminal();
+        structuredRef.current?.focusComposer();
+      },
+      sendInput: (data: string) => terminalRef.current?.sendInput(data),
+    }),
+    [],
+  );
+
+  return session?.view === "Structured" ? (
+    <StructuredPane ref={structuredRef} sessionId={sessionId} focus={focus} onClosed={onClosed} className={className} />
+  ) : (
+    <TerminalPane ref={terminalRef} sessionId={sessionId} focus={focus} onClosed={onClosed} className={className} />
+  );
+});

web/src/components/layout/PaneTitle.test.tsx

@@ -0,0 +1,48 @@
+// @vitest-environment happy-dom
+import { cleanup, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it } from "vitest";
+
+import type { Session } from "../../types.js";
+import { PaneTitle } from "./PaneTitle.js";
+
+afterEach(cleanup);
+
+function session(over: Partial<Session> = {}): Session {
+  return {
+    id: "s1",
+    cwd: "/home/n",
+    command: "claude",
+    env: {},
+    metadata: {},
+    status: "Running",
+    created_at: "2026-01-01T00:00:00Z",
+    ...over,
+  } as Session;
+}
+
+describe("PaneTitle", () => {
+  it("falls back to a short session id when the session isn't known yet", () => {
+    render(<PaneTitle sessionId="abcdef12-3456-7890-abcd-ef1234567890" />);
+    expect(screen.getByText(/abcdef12/)).toBeTruthy();
+  });
+
+  it("shows the name alone when the command matches it", () => {
+    render(<PaneTitle sessionId="s1" session={session({ command: "claude", metadata: { name: "claude" } })} />);
+    expect(screen.getByText("claude")).toBeTruthy();
+    expect(document.querySelector(".at-cmd")).toBeNull();
+  });
+
+  it("shows the command alongside a custom name", () => {
+    render(
+      <PaneTitle sessionId="s1" session={session({ command: "hx src/main.rs", metadata: { name: "editor" } })} />,
+    );
+    expect(screen.getByText("editor")).toBeTruthy();
+    expect(document.querySelector(".at-cmd")).not.toBeNull();
+  });
+
+  it("never injects markup from a session name", () => {
+    render(<PaneTitle sessionId="s1" session={session({ metadata: { name: "<img onerror=x>" } })} />);
+    expect(document.querySelector("img")).toBeNull();
+    expect(screen.getByText("<img onerror=x>")).toBeTruthy();
+  });
+});

web/src/components/layout/PaneTitle.tsx

@@ -0,0 +1,39 @@
+// React port of paneTitle.ts: a pane header's session identity — the name,
+// then the command as its tool mark when recognised, same as the sidebar
+// card's own CommandFragment (SessionCard.tsx). JSX escapes text nodes, so
+// unlike the vanilla string-builder this needs no manual HTML escaping.
+
+import { splitCommand, toolIconSvg } from "../../toolIcon.js";
+import { sessionName, type Session, type Uuid } from "../../types.js";
+
+export interface PaneTitleProps {
+  sessionId: Uuid;
+  session?: Session;
+  className?: string;
+}
+
+export function PaneTitle({ sessionId, session, className }: PaneTitleProps) {
+  if (!session) {
+    return (
+      <span className={className ?? "at-title"} title={sessionId}>
+        session <span className="sid">{sessionId.slice(0, 8)}</span>
+      </span>
+    );
+  }
+
+  const name = sessionName(session);
+  const showCommand = Boolean(session.command) && session.command !== name;
+  const { tool, program } = splitCommand(session.command);
+  const icon = tool ? toolIconSvg(tool) : null;
+
+  return (
+    <span className={className ?? "at-title"} title={`${name} · ${session.command}  (${sessionId})`}>
+      <span className="at-name">{name}</span>
+      {showCommand && (
+        <span className="at-cmd">
+          {icon ? <span className="contents" dangerouslySetInnerHTML={{ __html: icon }} /> : <span>{program}</span>}
+        </span>
+      )}
+    </span>
+  );
+}

web/src/components/layout/TabBar.test.tsx

@@ -0,0 +1,88 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { createLayoutStore } from "../../stores/layoutStore.js";
+import { TabBar } from "./TabBar.js";
+
+afterEach(cleanup);
+
+function store() {
+  return createLayoutStore({
+    load: () => null,
+    save: vi.fn(),
+    scheduler: { setTimer: () => 1, clearTimer: () => {} },
+  });
+}
+
+function dataTransfer() {
+  const data = new Map<string, string>();
+  return {
+    setData: (type: string, value: string) => data.set(type, value),
+    getData: (type: string) => data.get(type) ?? "",
+    effectAllowed: "",
+  };
+}
+
+describe("TabBar", () => {
+  it("renders one tab per layout tab, marking the active one", () => {
+    const s = store();
+    s.getState().addTab();
+    render(<TabBar store={s} />);
+    const tabs = screen.getAllByRole("tab");
+    expect(tabs).toHaveLength(2);
+    expect(tabs[1].getAttribute("aria-selected")).toBe("true");
+    expect(tabs[0].getAttribute("aria-selected")).toBe("false");
+  });
+
+  it("shows the open-session count next to a tab's title", () => {
+    const s = store();
+    s.getState().openSession("s1");
+    render(<TabBar store={s} />);
+    expect(screen.getByText(/· 1/)).toBeTruthy();
+  });
+
+  it("clicking a tab selects it", () => {
+    const s = store();
+    s.getState().addTab();
+    const [first] = s.getState().layout.tabs;
+    render(<TabBar store={s} />);
+    fireEvent.click(screen.getAllByRole("tab")[0]);
+    expect(s.getState().layout.activeTabId).toBe(first.id);
+  });
+
+  it("the + button adds a tab", () => {
+    const s = store();
+    render(<TabBar store={s} />);
+    fireEvent.click(screen.getByTitle("New tab"));
+    expect(s.getState().layout.tabs).toHaveLength(2);
+  });
+
+  it("hides the close control on the last remaining tab", () => {
+    const s = store();
+    render(<TabBar store={s} />);
+    expect(screen.queryByTitle("Close tab")).toBeNull();
+  });
+
+  it("closing a tab removes it", () => {
+    const s = store();
+    s.getState().addTab();
+    render(<TabBar store={s} />);
+    fireEvent.click(screen.getAllByTitle("Close tab")[0]);
+    expect(s.getState().layout.tabs).toHaveLength(1);
+  });
+
+  it("dragging a tab onto another reorders them", () => {
+    const s = store();
+    s.getState().addTab();
+    s.getState().addTab();
+    const [a, b, c] = s.getState().layout.tabs;
+    render(<TabBar store={s} />);
+    const tabs = screen.getAllByRole("tab");
+    const dt = dataTransfer();
+    fireEvent.dragStart(tabs[0], { dataTransfer: dt });
+    fireEvent.dragOver(tabs[2], { dataTransfer: dt });
+    fireEvent.drop(tabs[2], { dataTransfer: dt });
+    expect(s.getState().layout.tabs.map((t) => t.id)).toEqual([b.id, c.id, a.id]);
+  });
+});

web/src/components/layout/TabBar.tsx

@@ -0,0 +1,102 @@
+// The tab strip above the canvas (issue #249): click to switch, drag to
+// reorder, a close ✕ per tab (hidden on the last one), a trailing + to add.
+
+import { useState } from "react";
+import { useStore } from "zustand";
+
+import { leaves } from "../../layout.js";
+import type { LayoutStore, LayoutStoreApi } from "../../stores/layoutStore.js";
+
+export interface TabBarProps {
+  store: LayoutStoreApi;
+}
+
+export function TabBar({ store }: TabBarProps) {
+  const layout = useStore(store, (s: LayoutStore) => s.layout);
+  const previewTempTabId = useStore(store, (s: LayoutStore) => s.preview?.tempTabId ?? null);
+  const [draggingId, setDraggingId] = useState<string | null>(null);
+  const [overId, setOverId] = useState<string | null>(null);
+
+  return (
+    <div className="mv-tabs flex items-center gap-sp-1 overflow-x-auto border-b border-border-strong bg-surface px-sp-2 text-fs-12" role="tablist">
+      {layout.tabs.map((tab) => {
+        const count = leaves(tab.root).filter((l) => l.sessionId).length;
+        const isActive = tab.id === layout.activeTabId;
+        const isDropTarget = overId === tab.id && draggingId !== null && draggingId !== tab.id;
+        // A preview's throwaway tab is not a place to go — it goes on its
+        // own the moment the preview ends (docs/PREVIEW.md).
+        const isPreviewTab = tab.id === previewTempTabId;
+        return (
+          <button
+            key={tab.id}
+            type="button"
+            role="tab"
+            aria-selected={isActive}
+            draggable
+            data-tab-id={tab.id}
+            className={
+              "mv-tab flex items-center gap-sp-1 rounded-t-r-1 px-sp-2 py-sp-1 " +
+              (isPreviewTab
+                ? "border border-dashed border-preview-ring italic text-preview"
+                : isActive
+                  ? "bg-surface-2 text-ink"
+                  : "text-faint hover:text-ink") +
+              (isDropTarget ? " outline outline-2 outline-accent" : "")
+            }
+            onDragStart={(e) => {
+              setDraggingId(tab.id);
+              e.dataTransfer.setData("text/plain", tab.id);
+              e.dataTransfer.effectAllowed = "move";
+            }}
+            onDragOver={(e) => {
+              if (!draggingId || draggingId === tab.id) return;
+              e.preventDefault();
+              setOverId(tab.id);
+            }}
+            onDragLeave={() => setOverId((current) => (current === tab.id ? null : current))}
+            onDrop={(e) => {
+              e.preventDefault();
+              const fromId = e.dataTransfer.getData("text/plain") || draggingId;
+              setDraggingId(null);
+              setOverId(null);
+              if (fromId && fromId !== tab.id) store.getState().reorderTab(fromId, tab.id);
+            }}
+            onDragEnd={() => {
+              setDraggingId(null);
+              setOverId(null);
+            }}
+            onClick={() => {
+              if (isPreviewTab) return;
+              store.getState().selectTab(tab.id);
+            }}
+          >
+            <span>
+              {tab.title}
+              {count ? ` · ${count}` : ""}
+            </span>
+            {layout.tabs.length > 1 && !isPreviewTab && (
+              <span
+                className="mv-tab-close text-faint hover:text-ink"
+                title="Close tab"
+                onClick={(e) => {
+                  e.stopPropagation();
+                  store.getState().closeTab(tab.id);
+                }}
+              >
+                ✕
+              </span>
+            )}
+          </button>
+        );
+      })}
+      <button
+        type="button"
+        className="mv-tab-add px-sp-2 py-sp-1 text-muted hover:text-ink"
+        title="New tab"
+        onClick={() => store.getState().addTab()}
+      >
+        +
+      </button>
+    </div>
+  );
+}

web/src/components/sidebar/ContextMenu.tsx

@@ -1,64 +0,0 @@
-// Right-click menu on a session card (docs/SIDEBAR.md): rename, spawn similar,
-// kill. Rendered into <body> so a scrolling sidebar cannot clip it.
-
-import { useEffect, useRef } from "react";
-import { createPortal } from "react-dom";
-
-export interface ContextMenuItem {
-  label: string;
-  danger?: boolean;
-  onSelect(): void;
-}
-
-export interface ContextMenuProps {
-  x: number;
-  y: number;
-  items: ContextMenuItem[];
-  onClose(): void;
-}
-
-export function ContextMenu({ x, y, items, onClose }: ContextMenuProps) {
-  const ref = useRef<HTMLDivElement>(null);
-
-  useEffect(() => {
-    const onKey = (e: KeyboardEvent) => {
-      if (e.key === "Escape") onClose();
-    };
-    const onDown = (e: Event) => {
-      if (!ref.current?.contains(e.target as Node)) onClose();
-    };
-    document.addEventListener("keydown", onKey);
-    document.addEventListener("pointerdown", onDown, true);
-    return () => {
-      document.removeEventListener("keydown", onKey);
-      document.removeEventListener("pointerdown", onDown, true);
-    };
-  }, [onClose]);
-
-  return createPortal(
-    <div
-      ref={ref}
-      role="menu"
-      className="context-menu fixed z-modal min-w-[160px] rounded-r-2 border border-border-strong bg-surface py-sp-1 shadow-2"
-      style={{ left: x, top: y }}
-    >
-      {items.map((item) => (
-        <button
-          key={item.label}
-          type="button"
-          role="menuitem"
-          className={`block w-full px-sp-3 py-sp-1 text-left text-fs-12 hover:bg-surface-2 ${
-            item.danger ? "text-danger" : "text-ink"
-          }`}
-          onClick={() => {
-            onClose();
-            item.onSelect();
-          }}
-        >
-          {item.label}
-        </button>
-      ))}
-    </div>,
-    document.body,
-  );
-}

web/src/components/sidebar/KillConfirm.tsx

@@ -1,63 +0,0 @@
-// docs/SIDEBAR.md "Killing a session": every kill confirms first, and the
-// confirmation names what the card last saw in the way — the daemon refuses an
-// unforced kill over such a tree, and saying so beforehand is cheaper than the
-// refusal. Cancel holds the focus so a stray Enter kills nothing.
-
-import { useEffect, useRef } from "react";
-import { createPortal } from "react-dom";
-
-import type { InTheWay } from "../../types.js";
-import { formatInTheWay } from "../../types.js";
-
-export interface KillConfirmProps {
-  name: string;
-  blockers: InTheWay | null;
-  /** Set when the daemon already refused an unforced kill: this pass forces. */
-  force?: boolean;
-  onConfirm(): void;
-  onCancel(): void;
-}
-
-export function KillConfirm(props: KillConfirmProps) {
-  const cancel = useRef<HTMLButtonElement>(null);
-  useEffect(() => cancel.current?.focus(), []);
-
-  return createPortal(
-    <div
-      role="dialog"
-      aria-modal="true"
-      aria-label={props.force ? "Force kill session" : "Kill session"}
-      className="kill-confirm fixed inset-0 z-modal flex items-center justify-center bg-bg/70"
-      onKeyDown={(e) => {
-        if (e.key === "Escape") props.onCancel();
-      }}
-    >
-      <div className="min-w-[280px] rounded-r-2 border border-border-strong bg-surface p-sp-4 shadow-2">
-        <p className="text-fs-13 text-ink">
-          {props.force ? "Force kill" : "Kill"} <strong>{props.name}</strong>?
-        </p>
-        {props.blockers && (
-          <p className="mt-sp-2 text-fs-12 text-warn">{formatInTheWay(props.blockers)}</p>
-        )}
-        <div className="mt-sp-3 flex justify-end gap-sp-2">
-          <button
-            ref={cancel}
-            type="button"
-            className="rounded-r-1 border border-border px-sp-3 py-sp-1 text-fs-12 text-ink"
-            onClick={props.onCancel}
-          >
-            Cancel
-          </button>
-          <button
-            type="button"
-            className="rounded-r-1 bg-danger px-sp-3 py-sp-1 text-fs-12 text-accent-ink"
-            onClick={props.onConfirm}
-          >
-            {props.force ? "Force kill" : "Kill"}
-          </button>
-        </div>
-      </div>
-    </div>,
-    document.body,
-  );
-}

web/src/components/sidebar/Sidebar.tsx

@@ -10,9 +10,10 @@ import type { CatalogStore, CatalogStoreApi } from "../../stores/catalogStore.js
 import type { InTheWay, Session } from "../../types.js";
 import { sessionBlockers, sessionName } from "../../types.js";
 import { buildTree, type TreeNode } from "../../tree.js";
-import { ContextMenu, type ContextMenuItem } from "./ContextMenu.js";
+import { KILL_SESSION_EVENT, RENAME_SESSION_EVENT } from "../../uiEvents.js";
+import { ContextMenu, type ContextMenuItem } from "../common/ContextMenu.js";
 import { FolderNode } from "./FolderNode.js";
-import { KillConfirm } from "./KillConfirm.js";
+import { KillDialog } from "../dialogs/KillDialog.js";
 import { SessionCard } from "./SessionCard.js";
 import { SidebarSearch } from "./SidebarSearch.js";
 import { filterSessions, firstRowUnder, navRows, sessionKey } from "./model.js";
@@ -58,6 +59,8 @@ interface KillState {
   session: Session;
   blockers: InTheWay | null;
   force: boolean;
+  /** The daemon's refusal message, once an unforced kill has been refused. */
+  reason?: string;
 }
 
 export function Sidebar(props: SidebarProps) {
@@ -158,6 +161,27 @@ export function Sidebar(props: SidebarProps) {
     return sessions.find((s) => s.id === row.id);
   }, [rows, navKey, sessions]);
 
+  // The command bar's action page raises these rather than reimplementing
+  // either flow (docs/COMMAND-BAR.md): a kill from the bar goes through the
+  // same confirm-and-blockers dialog the card's ✕ does, and a rename from the
+  // bar opens the card's own inline field.
+  useEffect(() => {
+    const onKillRequest = (e: Event) => {
+      const s = (e as CustomEvent<Session>).detail;
+      if (s) beginKill(s);
+    };
+    const onRenameRequest = (e: Event) => {
+      const s = (e as CustomEvent<Session>).detail;
+      if (s) setRenamingId(s.id);
+    };
+    document.addEventListener(KILL_SESSION_EVENT, onKillRequest);
+    document.addEventListener(RENAME_SESSION_EVENT, onRenameRequest);
+    return () => {
+      document.removeEventListener(KILL_SESSION_EVENT, onKillRequest);
+      document.removeEventListener(RENAME_SESSION_EVENT, onRenameRequest);
+    };
+  }, [beginKill]);
+
   const onKeyDown = (e: React.KeyboardEvent) => {
     // The inline rename field owns its own keys; the walk stays out of it.
     if (e.target instanceof HTMLInputElement) return;
@@ -296,15 +320,18 @@ export function Sidebar(props: SidebarProps) {
         />
       )}
       {kill && (
-        <KillConfirm
+        <KillDialog
           name={sessionName(kill.session)}
           blockers={kill.blockers}
           force={kill.force}
+          reason={kill.reason}
           onCancel={() => setKill(null)}
-          onConfirm={() => {
+          onConfirm={async () => {
             const { session: s, force } = kill;
-            setKill(null);
-            void killSession(s.id, force).catch((e: unknown) => {
+            try {
+              await killSession(s.id, force);
+              setKill(null);
+            } catch (e: unknown) {
               // The daemon refuses an unforced kill over a worktree holding
               // unsaved work; that refusal needs its own prompt
               // (docs/WORKTREES.md).
@@ -313,9 +340,12 @@ export function Sidebar(props: SidebarProps) {
                   session: s,
                   blockers: e.unsavedWork ?? sessionBlockers(s),
                   force: true,
+                  reason: e.message,
                 });
+                return;
               }
-            });
+              throw e;
+            }
           }}
         />
       )}

web/src/components/sidebar/index.ts

@@ -3,6 +3,5 @@ export { SessionCard, type SessionCardProps } from "./SessionCard.js";
 export { FolderNode, type FolderNodeProps } from "./FolderNode.js";
 export { SidebarSearch, type SidebarSearchProps } from "./SidebarSearch.js";
 export { ActivityRail } from "./ActivityRail.js";
-export { ContextMenu, type ContextMenuItem } from "./ContextMenu.js";
-export { KillConfirm } from "./KillConfirm.js";
+export { ContextMenu, type ContextMenuItem } from "../common/ContextMenu.js";
 export * from "./model.js";

web/src/components/spawn/BranchPicker.tsx

@@ -3,7 +3,7 @@
 // spawnForm.ts's `.adv-group`/`.wt-body`/`.wt-mode` markup.
 
 import type { BranchInfo } from "../../types.js";
-import type { WorktreeBranchMode } from "../../spawnForm.js";
+import type { WorktreeBranchMode } from "./model.js";
 
 export interface BranchPickerProps {
   enabled: boolean;

web/src/components/spawn/SpawnForm.tsx

@@ -42,7 +42,7 @@ import {
   type SpawnFormSeed,
   type SpawnFormValues,
   type WorktreeBranchMode,
-} from "../../spawnForm.js";
+} from "./model.js";
 import { splitCommand, toolIconSvg, TOOL_LABELS } from "../../toolIcon.js";
 import { abbreviateCwd } from "../../types.js";
 import type { BranchInfo, Project, Session, SpawnPreset } from "../../types.js";

web/src/components/spawn/index.ts

@@ -5,4 +5,4 @@ export { BranchPicker, type BranchPickerProps } from "./BranchPicker.js";
 export { useFastForward, type UseFastForwardOptions } from "./useFastForward.js";
 // spawnSimilar.ts is pure seed-building logic with no DOM dependency — reused
 // as-is rather than re-implemented for React (#248).
-export { spawnSimilarSeed, spawnSimilarProjectSeed } from "../../spawnSimilar.js";
+export { spawnSimilarSeed, spawnSimilarProjectSeed } from "./spawnSimilar.js";

web/src/components/spawn/model.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 
-import { buildSpawnRequest, type SpawnFormValues } from "./spawnForm.js";
+import { buildSpawnRequest, type SpawnFormValues } from "./model.js";
 
 const base: SpawnFormValues = {
   command: "claude",

web/src/components/spawn/model.ts

@@ -0,0 +1,104 @@
+// Pure spawn-form model, kept when spawnForm.ts's imperative DOM form was
+// deleted (#253): the value/seed shapes, the request builder, and the preset
+// fallback. SpawnForm.tsx and useFastForward.ts render from these.
+
+import { splitCommand } from "../../toolIcon.js";
+import type { CreateSessionRequest, SpawnPreset } from "../../types.js";
+
+export const STRUCTURED_VIEW_TOOLS = new Set(["claude", "codex"]);
+
+export function supportsStructuredView(command: string): boolean {
+  const tool = splitCommand(command).tool;
+  return tool !== null && STRUCTURED_VIEW_TOOLS.has(tool);
+}
+
+/** Where a worktree's branch comes from: freshly created (default) or picked
+ * from the repository's existing branches (#61). */
+export type WorktreeBranchMode = "new" | "existing";
+
+/** Seed values for the spawn form — used by "Spawn similar" to open the modal
+ * with the same cwd, command, and name as an existing session, and by the
+ * fast-forward fallback to pre-fill whatever it did resolve. */
+export interface SpawnFormSeed {
+  command?: string;
+  cwd?: string;
+  name?: string;
+  worktreeEnabled?: boolean;
+  worktreeBranch?: string;
+  /** Whether the operator typed the branch themselves, rather than it having
+   *  been auto-synced from the session name. Carried separately because the
+   *  value alone cannot distinguish the two. */
+  worktreeBranchEdited?: boolean;
+  worktreeBranchMode?: WorktreeBranchMode;
+  cwdRawVisible?: boolean;
+}
+
+/** The form's current values, reported on every change. */
+export interface SpawnFormValues {
+  command: string;
+  cwd: string;
+  name: string;
+  structuredView: boolean;
+  autoApprove: boolean;
+  worktreeEnabled: boolean;
+  worktreeBranch: string;
+  worktreeBranchEdited: boolean;
+  /** "new" creates the branch; "existing" checks out a picked one (#61). */
+  worktreeBranchMode: WorktreeBranchMode;
+  /** Whether the cwd lives in the raw text input (vs a picked recent row). */
+  cwdRawVisible?: boolean;
+}
+
+export function buildSpawnRequest(
+  values: SpawnFormValues,
+  baseRepo: string | null,
+): { req: CreateSessionRequest } | { error: string } {
+  if (!values.cwd) return { error: "Pick a working directory." };
+  if (!values.command) return { error: "Pick a command (or fill the custom command)." };
+
+  const metadata: Record<string, unknown> = {};
+  const name = values.name.trim();
+  if (name) metadata.name = name;
+
+  const req: CreateSessionRequest = {
+    cwd: values.cwd,
+    command: values.command,
+    metadata,
+  };
+
+  if (values.structuredView && supportsStructuredView(values.command)) {
+    req.view = "Structured";
+  }
+
+  if (values.autoApprove) {
+    req.auto_approve = true;
+  }
+
+  if (values.worktreeEnabled) {
+    const mode = values.worktreeBranchMode ?? "new";
+    const branch = values.worktreeBranch.trim();
+    if (!baseRepo) return { error: "Worktree needs a directory inside a git repository." };
+    if (!branch) {
+      return { error: mode === "existing" ? "Pick an existing branch." : "Worktree requires a branch name." };
+    }
+    req.worktree = {
+      base_repo: baseRepo,
+      branch,
+      // Existing-mode picks must check out as-is; the daemon creates
+      // anything else with `worktree add -b` (#56/#61).
+      create_branch: mode !== "existing",
+    };
+  }
+
+  return { req };
+}
+
+/** Built-ins used when the daemon's `/api/info` presets can't be fetched
+ * (older daemon, transient error). Mirrors `maestro_config::builtin_presets`.
+ * Exported for the fast-forward spawn's preset fallback (#67). */
+export const FALLBACK_PRESETS: SpawnPreset[] = [
+  { id: "claude", label: "Claude", command: "claude" },
+  { id: "opencode", label: "opencode", command: "opencode" },
+  { id: "zsh", label: "Shell", command: "zsh" },
+  { id: "custom", label: "Custom…", command: "" },
+];

web/src/components/spawn/spawnSimilar.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 import { spawnSimilarProjectSeed, spawnSimilarSeed } from "./spawnSimilar.js";
-import type { Session } from "./types.js";
+import type { Session } from "../../types.js";
 
 function session(overrides: Partial<Session> = {}): Session {
   return {

web/src/components/spawn/spawnSimilar.ts

@@ -1,8 +1,8 @@
 // "Spawn similar" (#28): the seed a cloned session hands to the spawn modal.
 // Pure — the caller owns opening the dialog.
 
-import type { SpawnFormSeed } from "./spawnForm.js";
-import type { Session } from "./types.js";
+import type { SpawnFormSeed } from "./model.js";
+import type { Session } from "../../types.js";
 
 /** Clone a session into form values: same project, same command, same
  *  worktree decision, fresh name.

web/src/components/spawn/useFastForward.ts

@@ -8,7 +8,7 @@ import { useCallback } from "react";
 
 import { createSession, fetchNames, getDaemonInfo, projects as fetchProjects } from "../../api.js";
 import { buildFastForwardRequest, fastForwardSeed, resolveFastForward } from "../../fastForward.js";
-import { FALLBACK_PRESETS, type SpawnFormSeed } from "../../spawnForm.js";
+import { FALLBACK_PRESETS, type SpawnFormSeed } from "./model.js";
 import type { Project, Session, SpawnPreset } from "../../types.js";
 
 export interface UseFastForwardOptions {

web/src/components/structured/ApprovalView.test.tsx

@@ -0,0 +1,84 @@
+// @vitest-environment happy-dom
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { ApprovalView } from "./ApprovalView.js";
+
+afterEach(cleanup);
+
+const ALL_OPTIONS = [
+  { optionId: "a1", name: "Allow once", kind: "allow_once" as const },
+  { optionId: "a2", name: "Allow always", kind: "allow_always" as const },
+  { optionId: "r1", name: "Reject", kind: "reject_once" as const },
+];
+
+function buttons(): string[] {
+  return [...document.querySelectorAll(".st-approval-acts button")].map((b) => b.textContent ?? "");
+}
+
+describe("ApprovalView", () => {
+  it("asks the operator with the three decisions the daemon exposes", () => {
+    render(
+      <ApprovalView
+        request={{ toolCall: { title: "Write(a.ts)", locations: [{ path: "/repo/a.ts" }] }, options: ALL_OPTIONS }}
+        pending
+        onDecide={() => Promise.resolve()}
+      />,
+    );
+    expect(buttons()).toEqual(["Allow once", "Allow for session", "Deny"]);
+    expect(screen.getByText("Write(a.ts)")).toBeTruthy();
+    expect(screen.getByText("/repo/a.ts")).toBeTruthy();
+  });
+
+  it("submits the decision the operator picked", async () => {
+    const onDecide = vi.fn().mockResolvedValue(undefined);
+    render(<ApprovalView request={{ options: ALL_OPTIONS }} pending onDecide={onDecide} />);
+    fireEvent.click(screen.getByText("Deny"));
+    await waitFor(() => expect(onDecide).toHaveBeenCalledWith("deny"));
+  });
+
+  it("disables every button once one is pressed, so a decision is sent once", () => {
+    render(<ApprovalView request={{ options: ALL_OPTIONS }} pending onDecide={() => new Promise(() => {})} />);
+    fireEvent.click(screen.getByText("Allow once"));
+    const all = [...document.querySelectorAll<HTMLButtonElement>(".st-approval-acts button")];
+    expect(all.every((b) => b.disabled)).toBe(true);
+  });
+
+  it("restores the controls when the decision failed and this approval is still pending", async () => {
+    const onDecide = vi.fn().mockRejectedValue(new Error("nope"));
+    render(<ApprovalView request={{ options: ALL_OPTIONS }} pending onDecide={onDecide} />);
+    fireEvent.click(screen.getByText("Allow once"));
+    await waitFor(() => {
+      const all = [...document.querySelectorAll<HTMLButtonElement>(".st-approval-acts button")];
+      expect(all.every((b) => !b.disabled)).toBe(true);
+    });
+  });
+
+  it("offers no button for a decision the request cannot back", () => {
+    render(
+      <ApprovalView
+        request={{ options: [{ optionId: "a1", name: "Allow once", kind: "allow_once" }] }}
+        pending
+        onDecide={() => Promise.resolve()}
+      />,
+    );
+    expect(buttons()).toEqual(["Allow once"]);
+  });
+
+  it("says so when the request offers no decision at all", () => {
+    render(<ApprovalView request={{ options: [] }} pending onDecide={() => Promise.resolve()} />);
+    expect(screen.getByText("no decision offered")).toBeTruthy();
+  });
+
+  it("renders a resolved approval as a one-liner, with no controls", () => {
+    render(
+      <ApprovalView
+        request={{ toolCall: { title: "Write(a.ts)" }, options: ALL_OPTIONS }}
+        pending={false}
+        onDecide={() => Promise.resolve()}
+      />,
+    );
+    expect(screen.getByText("Write(a.ts) — approved")).toBeTruthy();
+    expect(document.querySelector(".st-approval-acts")).toBeNull();
+  });
+});

web/src/components/structured/ApprovalView.tsx

@@ -0,0 +1,80 @@
+// An `Approval` row. The daemon exposes exactly three decisions
+// (docs/STRUCTURED-VIEW.md) and mints the nonce; this only solicits one of
+// them. A decision the request offers no matching ACP option for is not shown
+// — its button would "allow" something that silently resolves `Cancelled`.
+
+import { useState } from "react";
+
+import type { AcpPermissionOption, AcpToolCallLike, StructuredApprovalDecision } from "../../types.js";
+import { offeredDecisions, toolKindLabel } from "./model.js";
+
+const SPECS: [StructuredApprovalDecision, string, string][] = [
+  ["allow_once", "Allow once", "primary"],
+  ["allow_for_session", "Allow for session", ""],
+  ["deny", "Deny", "deny"],
+];
+
+export interface ApprovalViewProps {
+  /** The `RequestPermissionRequest` the row carries — serialized without its
+   *  nonce, which never leaves the daemon's live wire. */
+  request: { toolCall?: AcpToolCallLike; options?: AcpPermissionOption[] };
+  /** Whether this is the one live approval. A restored/answered row is not. */
+  pending: boolean;
+  /** Resolves once the decision reached the daemon; rejects only while this
+   *  approval is still the pending one, so the buttons can come back. */
+  onDecide: (decision: StructuredApprovalDecision) => Promise<void>;
+}
+
+export function ApprovalView({ request, pending, onDecide }: ApprovalViewProps) {
+  const [busy, setBusy] = useState(false);
+  const toolCall = request.toolCall ?? {};
+  const what = toolCall.title ?? toolKindLabel(toolCall.kind);
+
+  // Resolved approvals render as a compact one-liner inside a tool group (or
+  // are dropped entirely when standalone — see model.ts's transcriptItems).
+  if (!pending) {
+    return <div className="st-row st-row-approval st-approval-compact">{`${what} — approved`}</div>;
+  }
+
+  const offered = offeredDecisions(request.options ?? []);
+  const path = toolCall.locations?.[0]?.path;
+
+  const decide = (decision: StructuredApprovalDecision) => {
+    setBusy(true);
+    onDecide(decision).catch(() => {
+      // Rejects only while this approval is still pending — restore the
+      // controls so the operator can retry. The error itself is surfaced by
+      // the pane's banner.
+      setBusy(false);
+    });
+  };
+
+  return (
+    <div className="st-row st-row-approval">
+      <div className="st-approval">
+        <div className="st-approval-title">
+          <span aria-hidden="true">⚠</span> permission requested
+        </div>
+        <div className="st-approval-what">{what}</div>
+        {path && <div className="st-approval-path">{path}</div>}
+        {offered.length > 0 ? (
+          <div className="st-approval-acts">
+            {SPECS.filter(([decision]) => offered.includes(decision)).map(([decision, label, cls]) => (
+              <button
+                key={decision}
+                type="button"
+                className={cls ? `act ${cls}` : "act"}
+                disabled={busy}
+                onClick={() => decide(decision)}
+              >
+                {label}
+              </button>
+            ))}
+          </div>
+        ) : (
+          <div className="st-approval-resolved">no decision offered</div>
+        )}
+      </div>
+    </div>
+  );
+}

web/src/components/structured/Composer.tsx

@@ -0,0 +1,391 @@
+// The composer: draft, attachments, `/` command autocomplete off the live
+// `available_commands_update` notices, the session-settings menu, and the
+// send/cancel pair. Sending is the pane's job — this only hands it a draft and
+// the files that go with it.
+
+import {
+  useCallback,
+  useEffect,
+  useLayoutEffect,
+  useRef,
+  useState,
+  type ChangeEvent,
+  type ClipboardEvent,
+  type DragEvent,
+  type FormEvent,
+  type KeyboardEvent,
+} from "react";
+
+import type { AcpSessionConfigChoice, AcpSessionConfigOption } from "../../types.js";
+import {
+  applyCommand,
+  commandTokenAt,
+  filterCommands,
+  orderConfigOptions,
+  type AvailableCommand,
+} from "./model.js";
+
+/** Per-message ceilings the daemon enforces on uploads
+ *  (docs/STRUCTURED-VIEW.md, "Prompt and cancel"). */
+export const MAX_ATTACHMENTS = 10;
+export const MAX_ATTACHMENT_BYTES = 20 * 1024 * 1024;
+/** Pasted text at or above either bound becomes a `.txt` attachment instead of
+ *  going inline. */
+const PASTE_TO_FILE_CHARS = 4_000;
+const PASTE_TO_FILE_LINES = 40;
+
+export interface ComposerProps {
+  /** Files chosen but not yet sent. Owned by the pane so a failed send can put
+   *  them back. */
+  attachments: File[];
+  onAttachmentsChange(files: File[]): void;
+  commands: AvailableCommand[];
+  configOptions: AcpSessionConfigOption[];
+  /** A turn is in flight — the cancel control replaces nothing, it appears
+   *  beside send (a queued message is still allowed). */
+  turnActive: boolean;
+  /** An upload/POST is in flight: the attachment controls are frozen. */
+  uploading: boolean;
+  configBusy: boolean;
+  /** Restored into the box when a send fails. */
+  draft: string;
+  onDraftChange(draft: string): void;
+  onSubmit(text: string, attachments: File[]): void;
+  onCancel(): void;
+  onConfigChange(option: AcpSessionConfigOption, value: string | boolean): void;
+  onError(message: string): void;
+  menuId: string;
+}
+
+function configChoices(option: AcpSessionConfigOption): AcpSessionConfigChoice[] {
+  return (option.options ?? []).flatMap((choice) => ("options" in choice ? choice.options : [choice]));
+}
+
+function currentConfigLabel(option: AcpSessionConfigOption): string {
+  if (typeof option.currentValue === "boolean") return option.currentValue ? "On" : "Off";
+  return configChoices(option).find((choice) => choice.value === option.currentValue)?.name
+    ?? String(option.currentValue);
+}
+
+export function Composer({
+  attachments,
+  onAttachmentsChange,
+  commands,
+  configOptions,
+  turnActive,
+  uploading,
+  configBusy,
+  draft,
+  onDraftChange,
+  onSubmit,
+  onCancel,
+  onConfigChange,
+  onError,
+  menuId,
+}: ComposerProps) {
+  const inputRef = useRef<HTMLTextAreaElement | null>(null);
+  const fileRef = useRef<HTMLInputElement | null>(null);
+  const configRef = useRef<HTMLDivElement | null>(null);
+  const [caret, setCaret] = useState(0);
+  const [activeCommand, setActiveCommand] = useState(0);
+  const [configOpen, setConfigOpen] = useState(false);
+  /** Escape closes the menu until the draft or caret moves again. */
+  const [menuDismissed, setMenuDismissed] = useState(false);
+  const pasteCount = useRef(0);
+
+  // Grow with the draft, up to the CSS max-height; past that it scrolls.
+  useLayoutEffect(() => {
+    const input = inputRef.current;
+    if (!input) return;
+    input.style.height = "auto";
+    input.style.overflowY = "hidden";
+    input.style.height = `${Math.min(input.scrollHeight, 160)}px`;
+    if (input.scrollHeight > 160) input.style.overflowY = "auto";
+  }, [draft]);
+
+  useEffect(() => {
+    if (!configOpen) return;
+    const onPointerDown = (event: PointerEvent) => {
+      if (!configRef.current?.contains(event.target as Node)) setConfigOpen(false);
+    };
+    document.addEventListener("pointerdown", onPointerDown);
+    return () => document.removeEventListener("pointerdown", onPointerDown);
+  }, [configOpen]);
+
+  const token = commandTokenAt(draft, caret, caret);
+  const matches = token && commands.length > 0 ? filterCommands(commands, token.query) : [];
+  const menuOpen = matches.length > 0 && !menuDismissed;
+  const activeIndex = menuOpen ? Math.min(Math.max(activeCommand, 0), matches.length - 1) : -1;
+
+  const addFiles = useCallback(
+    (files: File[]) => {
+      if (uploading) return;
+      const next = [...attachments];
+      for (const file of files) {
+        if (file.size > MAX_ATTACHMENT_BYTES) {
+          onError(`${file.name} exceeds 20 MiB. Choose a smaller file.`);
+        } else if (next.length >= MAX_ATTACHMENTS) {
+          onError(`Attach up to ${MAX_ATTACHMENTS} files per message.`);
+        } else {
+          next.push(file);
+        }
+      }
+      onAttachmentsChange(next);
+    },
+    [attachments, onAttachmentsChange, onError, uploading],
+  );
+
+  const syncCaret = () => {
+    setMenuDismissed(false);
+    setCaret(inputRef.current?.selectionStart ?? 0);
+  };
+
+  const chooseCommand = (command: AvailableCommand) => {
+    const input = inputRef.current;
+    if (!input) return;
+    const current = commandTokenAt(draft, input.selectionStart, input.selectionEnd);
+    if (!current) return;
+    const applied = applyCommand(draft, current, command.name);
+    onDraftChange(applied.value);
+    setActiveCommand(0);
+    // The caret has to move after React has written the new value.
+    requestAnimationFrame(() => {
+      input.focus();
+      input.setSelectionRange(applied.cursor, applied.cursor);
+      setCaret(applied.cursor);
+    });
+  };
+
+  const submit = () => {
+    if ((!draft.trim() && attachments.length === 0) || uploading) return;
+    onSubmit(draft, attachments);
+  };
+
+  const onKeyDown = (event: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (menuOpen) {
+      if (event.key === "ArrowDown" || event.key === "ArrowUp") {
+        event.preventDefault();
+        const direction = event.key === "ArrowDown" ? 1 : -1;
+        setActiveCommand((index) => (index + direction + matches.length) % matches.length);
+        return;
+      }
+      if ((event.key === "Enter" && !event.shiftKey) || event.key === "Tab") {
+        event.preventDefault();
+        chooseCommand(matches[activeIndex]);
+        return;
+      }
+      if (event.key === "Escape") {
+        event.preventDefault();
+        setMenuDismissed(true);
+        return;
+      }
+    }
+    if (event.key === "Enter" && !event.shiftKey) {
+      event.preventDefault();
+      submit();
+    }
+  };
+
+  const onPaste = (event: ClipboardEvent<HTMLTextAreaElement>) => {
+    const clipboard = event.clipboardData;
+    if (!clipboard || uploading) return;
+    if (clipboard.files.length) {
+      event.preventDefault();
+      addFiles(Array.from(clipboard.files));
+      return;
+    }
+    const text = clipboard.getData("text/plain");
+    if (text.length < PASTE_TO_FILE_CHARS && text.split("\n").length < PASTE_TO_FILE_LINES) return;
+    // No slot for it, or too big to upload: leave it inline rather than
+    // dropping it on the floor.
+    if (attachments.length >= MAX_ATTACHMENTS || new Blob([text]).size > MAX_ATTACHMENT_BYTES) return;
+    event.preventDefault();
+    addFiles([new File([text], `pasted-${++pasteCount.current}.txt`, { type: "text/plain" })]);
+  };
+
+  const ordered = orderConfigOptions(configOptions);
+  const summary = ordered.map((option) => `${option.name}: ${currentConfigLabel(option)}`).join("\n");
+
+  return (
+    <form
+      className="structured-composer"
+      onSubmit={(event: FormEvent) => {
+        event.preventDefault();
+        submit();
+      }}
+      onDragOver={(event: DragEvent) => {
+        if (event.dataTransfer?.types.includes("Files")) event.preventDefault();
+      }}
+      onDrop={(event: DragEvent) => {
+        if (!event.dataTransfer?.files.length) return;
+        event.preventDefault();
+        addFiles(Array.from(event.dataTransfer.files));
+      }}
+    >
+      <button
+        type="button"
+        className="structured-attach"
+        aria-label="Attach files"
+        title="Attach files (up to 20 MiB each)"
+        disabled={uploading}
+        onClick={() => fileRef.current?.click()}
+      >
+        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" aria-hidden="true">
+          <path d="m8 12 7-7a3 3 0 0 1 4 4L9 19a5 5 0 0 1-7-7L12 2M5 14l9-9" />
+        </svg>
+      </button>
+      <input
+        ref={fileRef}
+        className="structured-file-input"
+        type="file"
+        multiple
+        hidden
+        disabled={uploading}
+        onChange={(event: ChangeEvent<HTMLInputElement>) => {
+          addFiles(Array.from(event.target.files ?? []));
+          event.target.value = "";
+        }}
+      />
+      <div className="structured-input-wrap">
+        <div className="structured-attachments" aria-label="Attachments" aria-live="polite" hidden={attachments.length === 0}>
+          {attachments.map((file, index) => (
+            <span key={`${file.name}-${index}`} className="structured-attachment">
+              <span title={`${file.name} (${file.size.toLocaleString()} bytes)`}>{file.name}</span>
+              <button
+                type="button"
+                aria-label={`Remove ${file.name}`}
+                disabled={uploading}
+                onClick={() => onAttachmentsChange(attachments.filter((_, i) => i !== index))}
+              >
+                ×
+              </button>
+            </span>
+          ))}
+        </div>
+        <div id={menuId} className="structured-command-menu" role="listbox" hidden={!menuOpen}>
+          {matches.map((command, index) => (
+            <div
+              key={command.name}
+              id={`${menuId}-option-${index}`}
+              className="structured-command-option"
+              role="option"
+              aria-selected={index === activeIndex}
+              onPointerDown={(event) => event.preventDefault()}
+              onClick={() => chooseCommand(command)}
+            >
+              <div className="structured-command-title">
+                <span className="structured-command-name">{`/${command.name}`}</span>
+                <span className="structured-command-hint">{command.input?.hint ?? ""}</span>
+              </div>
+              <div className="structured-command-description">
+                {command.description.replace(/\s+/g, " ").trim()}
+              </div>
+            </div>
+          ))}
+        </div>
+        <textarea
+          ref={inputRef}
+          className="structured-input"
+          rows={1}
+          placeholder="Reply, or / for commands…"
+          autoComplete="off"
+          aria-autocomplete="list"
+          aria-expanded={menuOpen}
+          aria-controls={menuId}
+          aria-activedescendant={activeIndex >= 0 ? `${menuId}-option-${activeIndex}` : undefined}
+          value={draft}
+          onChange={(event) => {
+            onDraftChange(event.target.value);
+            setActiveCommand(0);
+            setMenuDismissed(false);
+            setCaret(event.target.selectionStart ?? event.target.value.length);
+          }}
+          onClick={syncCaret}
+          onSelect={syncCaret}
+          onKeyUp={(event) => {
+            if (["ArrowLeft", "ArrowRight", "Home", "End"].includes(event.key)) syncCaret();
+          }}
+          onKeyDown={onKeyDown}
+          onPaste={onPaste}
+        />
+      </div>
+      <div className="structured-config" ref={configRef} hidden={ordered.length === 0}>
+        <button
+          type="button"
+          className="structured-config-trigger"
+          aria-haspopup="true"
+          aria-expanded={configOpen}
+          aria-label={`Session settings. ${summary.replaceAll("\n", ". ")}`}
+          title={summary}
+          disabled={configBusy}
+          onClick={() => setConfigOpen((open) => !open)}
+        >
+          <svg viewBox="0 0 24 24" aria-hidden="true">
+            <path d="M4 7h10M18 7h2M4 17h2M10 17h10M14 4v6M6 14v6" />
+          </svg>
+        </button>
+        <div
+          className="structured-config-menu"
+          role="group"
+          aria-label="Session settings"
+          hidden={!configOpen}
+          onKeyDown={(event) => {
+            if (event.key !== "Escape") return;
+            setConfigOpen(false);
+            configRef.current?.querySelector<HTMLButtonElement>(".structured-config-trigger")?.focus();
+          }}
+        >
+          {ordered.map((option) => (
+            <label key={option.id} className="structured-config-row" title={option.description ?? undefined}>
+              <span className="structured-config-name">{option.name}</span>
+              {option.type === "select" ? (
+                <select
+                  className="structured-config-select"
+                  disabled={configBusy}
+                  value={String(option.currentValue)}
+                  onChange={(event) => onConfigChange(option, event.target.value)}
+                >
+                  {configChoices(option).map((choice) => (
+                    <option key={choice.value} value={choice.value} title={choice.description ?? ""}>
+                      {choice.name}
+                    </option>
+                  ))}
+                </select>
+              ) : option.type === "boolean" ? (
+                <input
+                  type="checkbox"
+                  className="structured-config-toggle"
+                  disabled={configBusy}
+                  checked={option.currentValue === true}
+                  onChange={(event) => onConfigChange(option, event.target.checked)}
+                />
+              ) : null}
+            </label>
+          ))}
+        </div>
+      </div>
+      <button type="submit" className="structured-send">
+        <span>Send</span>
+        <svg viewBox="0 0 20 20" aria-hidden="true">
+          <path d="m7 5 5 5-5 5M12 10H3" />
+        </svg>
+      </button>
+      {turnActive && (
+        <button
+          type="button"
+          className="structured-cancel"
+          aria-label="Cancel turn"
+          title="Cancel turn"
+          onClick={onCancel}
+        >
+          <svg className="structured-cancel-spinner" viewBox="0 0 24 24" aria-hidden="true">
+            <circle cx="12" cy="12" r="10" fill="none" stroke="currentColor" strokeWidth="2" strokeDasharray="50 14" strokeLinecap="round" />
+          </svg>
+          <svg className="structured-cancel-stop" viewBox="0 0 24 24" aria-hidden="true">
+            <rect x="6" y="6" width="12" height="12" rx="2" fill="currentColor" />
+          </svg>
+        </button>
+      )}
+    </form>
+  );
+}

web/src/components/structured/Copyable.tsx

@@ -0,0 +1,101 @@
+// docs/STRUCTURED-VIEW.md: the web client's user, agent, thought, tool-detail
+// and notice text blocks copy their complete source text when clicked or
+// keyboard-activated. The visible node is whatever it wraps; this only adds
+// the affordance and the "copied"/"error" state the CSS reads.
+
+import { useCallback, useEffect, useRef, useState, type ElementType, type ReactNode } from "react";
+
+async function writeClipboard(text: string): Promise<void> {
+  try {
+    await navigator.clipboard.writeText(text);
+    return;
+  } catch {
+    const textarea = document.createElement("textarea");
+    textarea.value = text;
+    textarea.style.position = "fixed";
+    textarea.style.opacity = "0";
+    document.body.appendChild(textarea);
+    textarea.select();
+    const copied = document.execCommand?.("copy") ?? false;
+    textarea.remove();
+    if (!copied) throw new Error("clipboard unavailable");
+  }
+}
+
+export interface CopyableProps {
+  /** The complete source text — not whatever the DOM happens to show. */
+  text: string;
+  /** Names the thing in the "Copy …" label ("message", "diff", "path", …). */
+  label: string;
+  as?: ElementType;
+  className?: string;
+  title?: string;
+  children?: ReactNode;
+  /** Extra attributes the row builders set (`data-row-id`, `lang`, …). */
+  [key: string]: unknown;
+}
+
+/** Wrapping a node in a copy affordance. Empty `text` renders the node plain —
+ *  a control that copies nothing is worse than no control. */
+export function Copyable({
+  text,
+  label,
+  as: Tag = "div",
+  className,
+  children,
+  ...rest
+}: CopyableProps) {
+  const [copyState, setCopyState] = useState<"copied" | "error" | null>(null);
+  const timer = useRef<number | null>(null);
+
+  useEffect(
+    () => () => {
+      if (timer.current !== null) window.clearTimeout(timer.current);
+    },
+    [],
+  );
+
+  const copy = useCallback(() => {
+    void writeClipboard(text).then(
+      () => {
+        setCopyState("copied");
+        if (timer.current !== null) window.clearTimeout(timer.current);
+        timer.current = window.setTimeout(() => setCopyState(null), 1200);
+      },
+      () => setCopyState("error"),
+    );
+  }, [text]);
+
+  if (!text) {
+    return (
+      <Tag className={className} {...rest}>
+        {children}
+      </Tag>
+    );
+  }
+
+  const ariaLabel = copyState === "copied" ? `${label} copied` : `Copy ${label}`;
+  return (
+    <Tag
+      className={className ? `${className} st-copyable` : "st-copyable"}
+      tabIndex={0}
+      role="button"
+      aria-label={ariaLabel}
+      title={`Copy ${label}`}
+      data-copy-state={copyState ?? undefined}
+      onClick={(event: React.MouseEvent) => {
+        // A link inside the block is a link, not a copy target.
+        if ((event.target as Element | null)?.closest("a")) return;
+        copy();
+      }}
+      onKeyDown={(event: React.KeyboardEvent) => {
+        if (event.key !== "Enter" && event.key !== " ") return;
+        event.preventDefault();
+        copy();
+      }}
+      {...rest}
+    >
+      {children}
+    </Tag>
+  );
+}

web/src/components/structured/DiffView.test.tsx

@@ -0,0 +1,50 @@
+// @vitest-environment happy-dom
+import { cleanup, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it } from "vitest";
+
+import { DiffView } from "./DiffView.js";
+import { toolDiffMeta } from "./model.js";
+
+afterEach(cleanup);
+
+function lines(kind: string): string[] {
+  return [...document.querySelectorAll(`.st-ln-${kind}`)].map((el) => el.textContent ?? "");
+}
+
+describe("DiffView", () => {
+  it("marks insertions and deletions with their column prefixes", () => {
+    render(<DiffView diff={{ path: "src/a.ts", oldText: "one\ntwo\n", newText: "one\nTWO\nthree\n" }} />);
+    expect(lines("del")).toEqual(["- two"]);
+    expect(lines("add")).toEqual(["+ TWO", "+ three"]);
+    expect(lines("ctx")).toEqual(["  one"]);
+    expect(screen.getByText("src/a.ts")).toBeTruthy();
+  });
+
+  it("carries the +added −removed counts the tool head shows", () => {
+    render(<DiffView diff={{ path: "a.ts", oldText: "one\ntwo\n", newText: "one\nTWO\nthree\n" }} />);
+    const body = document.querySelector<HTMLElement>(".st-diff")!;
+    expect(body.dataset.added).toBe("2");
+    expect(body.dataset.removed).toBe("1");
+    expect(toolDiffMeta([{ type: "diff", path: "a.ts", oldText: "one\ntwo\n", newText: "one\nTWO\nthree\n" }]))
+      .toBe("+2 −1");
+  });
+
+  it("renders every line of a new file as added", () => {
+    render(<DiffView diff={{ path: "new.ts", newText: "alpha\nbeta\n" }} />);
+    expect(lines("add")).toEqual(["+ alpha", "+ beta"]);
+    expect(lines("del")).toEqual([]);
+  });
+
+  it("collapses a long unchanged run to a hunk summary", () => {
+    const filler = Array.from({ length: 20 }, (_, i) => `line ${i}`).join("\n");
+    render(<DiffView diff={{ path: "a.ts", oldText: `head\n${filler}\n`, newText: `HEAD\n${filler}\n` }} />);
+    expect(lines("hunk")).toEqual(["⋯ 17 unchanged lines ⋯"]);
+  });
+
+  it("copies the whole diff, prefixes included", () => {
+    render(<DiffView diff={{ path: "a.ts", oldText: "one\n", newText: "two\n" }} />);
+    const body = document.querySelector<HTMLElement>(".st-diff")!;
+    expect(body.getAttribute("aria-label")).toBe("Copy diff");
+    expect(body.textContent).toBe("- one+ two");
+  });
+});

web/src/components/structured/DiffView.tsx

@@ -0,0 +1,56 @@
+// A `Diff` content block, rendered as coloured hunks. ACP hands over whole
+// `oldText`/`newText`, so the lines and their `+added −removed` counts are
+// computed here (diff.ts) rather than parsed out of a patch.
+
+import { useMemo } from "react";
+
+import { computeDiffLines, diffStats, type DiffLine } from "./diff.js";
+import type { AcpDiff } from "../../types.js";
+import { Copyable } from "./Copyable.js";
+
+/** Column prefix by line kind. A `hunk` summary and an `eof` marker are their
+ *  own complete text, so neither takes one. */
+const PREFIX: Record<DiffLine["kind"], string> = {
+  add: "+ ",
+  del: "- ",
+  ctx: "  ",
+  hunk: "",
+  eof: "",
+};
+
+export function diffLineText(line: DiffLine): string {
+  return PREFIX[line.kind] + line.text;
+}
+
+export interface DiffViewProps {
+  diff: AcpDiff;
+}
+
+export function DiffView({ diff }: DiffViewProps) {
+  const lines = useMemo(() => computeDiffLines(diff.oldText, diff.newText), [diff.oldText, diff.newText]);
+  const stats = useMemo(() => diffStats(lines), [lines]);
+  const plain = useMemo(() => lines.map(diffLineText).join("\n"), [lines]);
+
+  return (
+    <div className="st-diff-block">
+      <Copyable className="st-diff-path" text={diff.path} label="path" title={diff.path}>
+        {diff.path}
+      </Copyable>
+      <Copyable
+        className="st-diff"
+        text={plain}
+        label="diff"
+        data-added={stats.added}
+        data-removed={stats.removed}
+      >
+        <pre>
+          {lines.map((line, index) => (
+            <span key={index} className={`st-ln st-ln-${line.kind}`}>
+              {diffLineText(line)}
+            </span>
+          ))}
+        </pre>
+      </Copyable>
+    </div>
+  );
+}

web/src/components/structured/StructuredPane.test.tsx

@@ -0,0 +1,403 @@
+// @vitest-environment happy-dom
+import { act, cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("../../api.js", async () => {
+  const actual = await vi.importActual<typeof import("../../api.js")>("../../api.js");
+  return {
+    ...actual,
+    sendStructuredPrompt: vi.fn().mockResolvedValue(undefined),
+    uploadStructuredFile: vi.fn().mockResolvedValue({ path: "/uploads/pasted.txt" }),
+    cancelStructuredTurn: vi.fn().mockResolvedValue(undefined),
+    resolveStructuredApproval: vi.fn().mockResolvedValue(undefined),
+    setStructuredConfig: vi.fn().mockResolvedValue(undefined),
+  };
+});
+
+import {
+  cancelStructuredTurn,
+  resolveStructuredApproval,
+  sendStructuredPrompt,
+  uploadStructuredFile,
+} from "../../api.js";
+import { INITIAL_RECONNECT_MS } from "../../reconnect.js";
+import type { ReducedState, StructuredEvent, TranscriptRow } from "../../types.js";
+import { StructuredPane } from "./StructuredPane.js";
+
+/** Just enough of a WebSocket for the pane to drive (mirrors structured.test.ts's
+ *  own fake, which the pre-React connection used). */
+class FakeSocket {
+  onopen: (() => void) | null = null;
+  onmessage: ((ev: { data: string }) => void) | null = null;
+  onerror: (() => void) | null = null;
+  onclose: ((ev: { code: number; reason: string }) => void) | null = null;
+  closed = false;
+
+  open(): void {
+    act(() => this.onopen?.());
+  }
+  emit(event: StructuredEvent): void {
+    act(() => this.onmessage?.({ data: JSON.stringify(event) }));
+  }
+  drop(code = 1006, reason = ""): void {
+    act(() => this.onclose?.({ code, reason }));
+  }
+  close(): void {
+    this.closed = true;
+  }
+}
+
+const idle: ReducedState = { turn: { responding: false, thinking: false, active_tool_calls: [] } };
+const busy: ReducedState = { turn: { responding: true, thinking: false, active_tool_calls: [] } };
+
+function row(id: string, kind: TranscriptRow["kind"], data: unknown = {}): TranscriptRow {
+  return { id, kind, data };
+}
+
+function chunk(id: string, kind: "user" | "agent_text" | "agent_thought", text: string): TranscriptRow {
+  return row(id, kind, { content: { type: "text", text } });
+}
+
+const APPROVAL_REQUEST = {
+  toolCall: { title: "Write(secrets.txt)", kind: "edit", locations: [{ path: "/repo/secrets.txt" }] },
+  options: [
+    { optionId: "a1", name: "Allow once", kind: "allow_once" },
+    { optionId: "a2", name: "Allow always", kind: "allow_always" },
+    { optionId: "r1", name: "Reject", kind: "reject_once" },
+  ],
+};
+
+function mount(): { socket: FakeSocket; sockets: FakeSocket[] } {
+  const sockets: FakeSocket[] = [];
+  render(
+    <StructuredPane
+      sessionId="s1"
+      socketFactory={() => {
+        const socket = new FakeSocket();
+        sockets.push(socket);
+        return socket as unknown as WebSocket;
+      }}
+    />,
+  );
+  sockets[0].open();
+  return { socket: sockets[0], sockets };
+}
+
+function snapshot(socket: FakeSocket, rows: TranscriptRow[], state: ReducedState = idle): void {
+  socket.emit({ type: "transcript_snapshot", snapshot: { cursor: rows.length, rows } });
+  socket.emit({ type: "reduced_state", state });
+}
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+describe("the eight row kinds", () => {
+  it("renders user, agent, thought, tool, diff, approval and notice rows; never a plan", () => {
+    const { socket } = mount();
+    snapshot(
+      socket,
+      [
+        chunk("user:1", "user", "please edit it"),
+        chunk("agent:1", "agent_text", "**bold** answer"),
+        chunk("thought:1", "agent_thought", "considering"),
+        row("tool:1", "tool_call", { title: "Read(src/main.ts)", kind: "read", status: "completed" }),
+        row("tool:2", "tool_diff", {
+          title: "Edit(a.ts)",
+          kind: "edit",
+          status: "completed",
+          content: [{ type: "diff", path: "a.ts", oldText: "one\n", newText: "one\ntwo\n" }],
+        }),
+        row("approval:1", "approval", APPROVAL_REQUEST),
+        row("plan", "plan", { entries: [{ content: "step", priority: "high", status: "pending" }] }),
+        row("notice:1", "notice", { sessionUpdate: "mystery_update" }),
+      ],
+      { ...idle, pending_approval: { nonce: "nonce-1", request: APPROVAL_REQUEST as never } },
+    );
+
+    expect(screen.getByText("please edit it")).toBeTruthy();
+    expect(document.querySelector(".st-row-agent strong")?.textContent).toBe("bold");
+    expect(document.querySelector(".st-row-thought")?.textContent).toContain("considering");
+    expect(screen.getByText("src/main.ts")).toBeTruthy();
+    // The diff row's head carries the line counts, not a fabricated duration.
+    expect(document.querySelector('[data-row-id="tool:2"] .st-tool-meta')?.textContent).toBe("+1 −0");
+    expect(screen.getByText("permission requested")).toBeTruthy();
+    expect(screen.getByText("[notice]")).toBeTruthy();
+    expect(document.querySelector('[data-row-id="plan"]')).toBeNull();
+  });
+
+  it("omits the state-only notices it consumes for `/` autocomplete", () => {
+    const { socket } = mount();
+    snapshot(socket, [
+      row("notice:1", "notice", {
+        sessionUpdate: "available_commands_update",
+        availableCommands: [{ name: "compact", description: "Compact the conversation" }],
+      }),
+      row("notice:2", "notice", { sessionUpdate: "session_info_update" }),
+    ]);
+    expect(screen.queryByText("[notice]")).toBeNull();
+
+    // …and offers them in the composer instead.
+    const input = document.querySelector<HTMLTextAreaElement>(".structured-input")!;
+    fireEvent.change(input, { target: { value: "/comp" } });
+    expect(screen.getByText("/compact")).toBeTruthy();
+  });
+
+  it("renders a completed turn's footer inline, and retires it once the next turn starts", () => {
+    const { socket } = mount();
+    const footer = row("turn_meta:1", "notice", {
+      maestroTurnMeta: { elapsedMs: 65_000, outcome: "completed", model: "sonnet", contextDelta: 1200 },
+    });
+    snapshot(socket, [chunk("user:1", "user", "go"), footer]);
+    expect(screen.getByText("1m 5s · +1.2k context tokens · sonnet")).toBeTruthy();
+
+    socket.emit({
+      type: "projection_update",
+      transcript: { type: "append", row: chunk("user:2", "user", "again") },
+      state: idle,
+    });
+    expect(screen.queryByText(/1m 5s/)).toBeNull();
+  });
+});
+
+describe("tool rows and activity groups", () => {
+  it("collapses two or more tools in a turn into one group, opened on click", () => {
+    const { socket } = mount();
+    snapshot(socket, [
+      chunk("user:1", "user", "go"),
+      row("tool:1", "tool_call", { title: "Read(a.ts)", kind: "read", status: "completed" }),
+      chunk("agent:1", "agent_text", "still working"),
+      row("tool:2", "tool_call", { title: "Read(b.ts)", kind: "read", status: "completed" }),
+      chunk("agent:2", "agent_text", "the answer"),
+    ]);
+
+    const head = screen.getByText("2 tool calls").closest("button")!;
+    expect(head.getAttribute("aria-expanded")).toBe("false");
+    // The final answer stays outside the group; the intermediate text is in it.
+    expect(document.querySelector(".st-tool-group")!.contains(screen.getByText("the answer"))).toBe(false);
+    expect(document.querySelector(".st-tool-group")!.contains(screen.getByText("still working"))).toBe(true);
+
+    fireEvent.click(head);
+    expect(head.getAttribute("aria-expanded")).toBe("true");
+  });
+
+  it("discloses a tool's output only once its head is opened", () => {
+    const { socket } = mount();
+    snapshot(socket, [
+      row("tool:1", "tool_call", {
+        title: "Execute(ls)",
+        kind: "execute",
+        status: "completed",
+        content: [{ type: "content", content: { type: "text", text: "a.ts\nb.ts" } }],
+        rawInput: { command: "ls" },
+        rawOutput: { exit_code: 0 },
+      }),
+    ]);
+    expect(document.querySelector(".st-tool-text")).toBeNull();
+
+    fireEvent.click(document.querySelector<HTMLButtonElement>(".st-tool-head")!);
+    expect(document.querySelector(".st-tool-text")?.textContent).toBe("a.ts\nb.ts");
+    expect(screen.getByText("Exit code")).toBeTruthy();
+    expect(document.querySelector(".st-tool-exit-ok")?.textContent).toBe("0");
+  });
+
+  it("patches a tool row in place rather than appending a second one", () => {
+    const { socket } = mount();
+    snapshot(socket, [row("tool:1", "tool_call", { title: "Read(a.ts)", kind: "read", status: "in_progress" })]);
+    expect(document.querySelector(".st-tool-meta")?.textContent).toBe("running");
+
+    socket.emit({
+      type: "projection_update",
+      transcript: {
+        type: "patch",
+        row: row("tool:1", "tool_call", { title: "Read(a.ts)", kind: "read", status: "completed" }),
+      },
+      state: idle,
+    });
+    expect(document.querySelectorAll('[data-row-id="tool:1"]')).toHaveLength(1);
+    expect(document.querySelector(".st-tool-meta")).toBeNull();
+  });
+});
+
+describe("approvals", () => {
+  it("answers with the live nonce, offering only the decisions the request backs", async () => {
+    const { socket } = mount();
+    snapshot(socket, [row("approval:1", "approval", APPROVAL_REQUEST)], {
+      ...idle,
+      pending_approval: { nonce: "nonce-1", request: APPROVAL_REQUEST as never },
+    });
+
+    expect(screen.getByText("/repo/secrets.txt")).toBeTruthy();
+    fireEvent.click(screen.getByText("Allow for session"));
+    await waitFor(() =>
+      expect(resolveStructuredApproval).toHaveBeenCalledWith("s1", "nonce-1", "allow_for_session"),
+    );
+  });
+
+  it("hides a decision the request offers no ACP option for", () => {
+    const { socket } = mount();
+    const request = { toolCall: { title: "Read(a.ts)" }, options: [{ optionId: "r", name: "No", kind: "reject_once" }] };
+    snapshot(socket, [row("approval:1", "approval", request)], {
+      ...idle,
+      pending_approval: { nonce: "nonce-2", request: request as never },
+    });
+    expect(screen.getByText("Deny")).toBeTruthy();
+    expect(screen.queryByText("Allow once")).toBeNull();
+  });
+
+  it("treats only the newest approval as pending, and hides resolved standalone ones", () => {
+    const { socket } = mount();
+    snapshot(
+      socket,
+      [row("approval:1", "approval", APPROVAL_REQUEST), row("approval:2", "approval", APPROVAL_REQUEST)],
+      { ...idle, pending_approval: { nonce: "nonce-3", request: APPROVAL_REQUEST as never } },
+    );
+    expect(screen.getAllByText("permission requested")).toHaveLength(1);
+    expect(screen.queryByText(/approved/)).toBeNull();
+  });
+
+  it("drops the controls once the approval is no longer pending", () => {
+    const { socket } = mount();
+    snapshot(socket, [row("approval:1", "approval", APPROVAL_REQUEST)], {
+      ...idle,
+      pending_approval: { nonce: "nonce-4", request: APPROVAL_REQUEST as never },
+    });
+    expect(screen.getByText("Allow once")).toBeTruthy();
+
+    socket.emit({ type: "reduced_state", state: idle });
+    expect(screen.queryByText("Allow once")).toBeNull();
+  });
+});
+
+describe("prompt and cancel", () => {
+  it("sends a draft, clearing the composer", async () => {
+    const { socket } = mount();
+    snapshot(socket, []);
+    const input = document.querySelector<HTMLTextAreaElement>(".structured-input")!;
+    fireEvent.change(input, { target: { value: "do the thing" } });
+    fireEvent.submit(document.querySelector("form.structured-composer")!);
+
+    await waitFor(() => expect(sendStructuredPrompt).toHaveBeenCalledWith("s1", "do the thing"));
+    expect(input.value).toBe("");
+  });
+
+  it("uploads attachments and names them in the prompt", async () => {
+    const { socket } = mount();
+    snapshot(socket, []);
+    const file = new File(["hello"], "notes.txt", { type: "text/plain" });
+    fireEvent.change(document.querySelector<HTMLInputElement>(".structured-file-input")!, {
+      target: { files: [file] },
+    });
+    expect(screen.getByText("notes.txt")).toBeTruthy();
+
+    fireEvent.change(document.querySelector<HTMLTextAreaElement>(".structured-input")!, {
+      target: { value: "read this" },
+    });
+    fireEvent.submit(document.querySelector("form.structured-composer")!);
+
+    await waitFor(() => expect(uploadStructuredFile).toHaveBeenCalled());
+    await waitFor(() =>
+      expect(sendStructuredPrompt).toHaveBeenCalledWith(
+        "s1",
+        'read this\n\nAttached file "notes.txt": "/uploads/pasted.txt"',
+      ),
+    );
+  });
+
+  it("queues a second message while a turn is in flight, and sends it when the turn ends", async () => {
+    const { socket } = mount();
+    snapshot(socket, [], busy);
+    fireEvent.change(document.querySelector<HTMLTextAreaElement>(".structured-input")!, {
+      target: { value: "next up" },
+    });
+    fireEvent.submit(document.querySelector("form.structured-composer")!);
+
+    expect(sendStructuredPrompt).not.toHaveBeenCalled();
+    expect(document.querySelector(".st-row-queued")?.textContent).toBe("next up");
+
+    socket.emit({ type: "reduced_state", state: idle });
+    await waitFor(() => expect(sendStructuredPrompt).toHaveBeenCalledWith("s1", "next up"));
+  });
+
+  it("hands a failed send's draft back to the operator", async () => {
+    vi.mocked(sendStructuredPrompt).mockRejectedValueOnce(new Error("boom"));
+    const { socket } = mount();
+    snapshot(socket, []);
+    const input = document.querySelector<HTMLTextAreaElement>(".structured-input")!;
+    fireEvent.change(input, { target: { value: "keep me" } });
+    fireEvent.submit(document.querySelector("form.structured-composer")!);
+
+    await waitFor(() => expect(document.querySelector(".structured-error")?.textContent).toContain("boom"));
+    expect(input.value).toBe("keep me");
+  });
+
+  it("shows the cancel control only while a turn is live", () => {
+    const { socket } = mount();
+    snapshot(socket, []);
+    expect(document.querySelector(".structured-cancel")).toBeNull();
+
+    socket.emit({ type: "reduced_state", state: busy });
+    fireEvent.click(document.querySelector<HTMLButtonElement>(".structured-cancel")!);
+    expect(cancelStructuredTurn).toHaveBeenCalledWith("s1");
+  });
+
+  it("reports live turn activity above the composer", () => {
+    const { socket } = mount();
+    snapshot(socket, [], {
+      turn: {
+        responding: true,
+        thinking: false,
+        active_tool_calls: ["t1", "t2"],
+        started_at: new Date(Date.now() - 5_000).toISOString(),
+      },
+      usage: { used: 12_000, size: 200_000 },
+    });
+    const activity = document.querySelector<HTMLElement>(".structured-activity")!;
+    expect(activity.hidden).toBe(false);
+    expect(activity.textContent).toContain("Running 2 tools");
+    expect(activity.textContent).toContain("12k context / 200k context");
+  });
+});
+
+describe("the socket", () => {
+  it("replaces the transcript wholesale on every snapshot, never merging", async () => {
+    const { socket, sockets } = mount();
+    snapshot(socket, [chunk("user:1", "user", "first")]);
+    socket.drop(1006);
+
+    // The retry is on reconnect.ts's backoff schedule, not immediate.
+    await act(async () => {
+      await new Promise((resolve) => setTimeout(resolve, INITIAL_RECONNECT_MS + 20));
+    });
+    const replacement = sockets[1];
+    expect(replacement).toBeDefined();
+    replacement.open();
+    snapshot(replacement, [chunk("user:2", "user", "second")]);
+    expect(screen.queryByText("first")).toBeNull();
+    expect(screen.getByText("second")).toBeTruthy();
+  });
+
+  it("reports a daemon rejection instead of retrying it", () => {
+    const status = vi.fn();
+    const sockets: FakeSocket[] = [];
+    render(
+      <StructuredPane
+        sessionId="s1"
+        onStatusChange={status}
+        socketFactory={() => {
+          const socket = new FakeSocket();
+          sockets.push(socket);
+          return socket as unknown as WebSocket;
+        }}
+      />,
+    );
+    sockets[0].open();
+    sockets[0].drop(4004, "not a structured session");
+    expect(sockets).toHaveLength(1);
+    expect(status).toHaveBeenCalledWith("error", "not a structured session");
+  });
+});

web/src/components/structured/StructuredPane.tsx

@@ -0,0 +1,400 @@
+// React port of structured.ts (#246): a live structured session — the
+// transcript from `WS /api/structured/:id`, the composer that drives
+// `.../prompt` and `.../cancel`, and the approval controls that answer
+// `.../approvals/:nonce`. docs/STRUCTURED-VIEW.md is the contract.
+//
+// Like TerminalPane, the pane draws the body only: pane chrome (title,
+// disconnect, sessions drawer) belongs to whatever composes it, which reads
+// the connection state through `onStatusChange`.
+
+import {
+  forwardRef,
+  useCallback,
+  useEffect,
+  useImperativeHandle,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+  useState,
+} from "react";
+
+import {
+  cancelStructuredTurn,
+  resolveStructuredApproval,
+  sendStructuredPrompt,
+  setStructuredConfig,
+  uploadStructuredFile,
+} from "../../api.js";
+import { formatContextTokens, formatElapsed } from "./render.js";
+import type {
+  AcpSessionConfigOption,
+  StructuredApprovalDecision,
+  TranscriptRow as Row,
+  Uuid,
+} from "../../types.js";
+import { Composer } from "./Composer.js";
+import {
+  commandsFromTranscript,
+  pendingApprovalRowId as pendingApprovalRowIdOf,
+  transcriptItems,
+  turnIsActive,
+} from "./model.js";
+import { ToolGroup } from "./ToolGroup.js";
+import { TranscriptRow } from "./TranscriptRow.js";
+import { useStructuredSession, type StructuredStatus, type StructuredSocketFactory } from "./useStructuredSession.js";
+import "./structured.css";
+
+/** Within this much of the bottom, wheel and touch imprecision should still
+ *  count as following. */
+const FOLLOW_BOTTOM_THRESHOLD_PX = 64;
+
+interface QueuedPrompt {
+  text: string;
+  attachments: File[];
+}
+
+export interface StructuredPaneProps {
+  sessionId: Uuid;
+  /** Grabs the composer once mounted. A sidebar preview passes `false`. */
+  focus?: boolean;
+  shouldReconnect?: (code: number) => boolean;
+  onClosed?: () => void;
+  onStatusChange?: (status: StructuredStatus, detail?: string) => void;
+  /** Test seam: drive the socket without a daemon. */
+  socketFactory?: StructuredSocketFactory;
+  className?: string;
+}
+
+export interface StructuredPaneHandle {
+  /** Put the keyboard in the composer — the structured pane's terminal. */
+  focusComposer(): void;
+}
+
+export const StructuredPane = forwardRef<StructuredPaneHandle, StructuredPaneProps>(function StructuredPane(
+  { sessionId, focus = true, shouldReconnect, onClosed, onStatusChange, socketFactory, className },
+  ref,
+) {
+  const session = useStructuredSession(sessionId, { shouldReconnect, onClosed, socketFactory });
+  const { rows, state, status, detail, socketGeneration } = session;
+
+  const scrollRef = useRef<HTMLDivElement | null>(null);
+  const composerRef = useRef<HTMLDivElement | null>(null);
+  const followingBottom = useRef(true);
+
+  const [expandedRows, setExpandedRows] = useState<ReadonlySet<string>>(new Set());
+  const [expandedGroups, setExpandedGroups] = useState<ReadonlySet<string>>(new Set());
+  const [draft, setDraft] = useState("");
+  const [attachments, setAttachments] = useState<File[]>([]);
+  const [queue, setQueue] = useState<QueuedPrompt[]>([]);
+  const [uploading, setUploading] = useState(false);
+  const [configBusy, setConfigBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [now, setNow] = useState(() => Date.now());
+  /** Server path → object URL, so a user row can preview an image it uploaded. */
+  const imageUrls = useRef(new Map<string, string>());
+
+  // Submission bookkeeping, ported from structured.ts: a prompt is "sending"
+  // from the POST until the projection shows the turn it claimed, and an
+  // acceptance that straddles a reconnect forces one more reconnect so the
+  // snapshot cannot predate the 204.
+  const submission = useRef(0);
+  const accepted = useRef<{ generation: number; socketGeneration: number } | null>(null);
+  const optimisticStart = useRef<number | null>(null);
+  const promptPending = useRef(false);
+  const [awaitingBegin, setAwaitingBegin] = useState<number | null>(null);
+
+  useImperativeHandle(
+    ref,
+    () => ({
+      focusComposer: () => composerRef.current?.querySelector<HTMLTextAreaElement>(".structured-input")?.focus(),
+    }),
+    [],
+  );
+
+  useEffect(() => {
+    onStatusChange?.(status, detail ?? undefined);
+  }, [status, detail, onStatusChange]);
+
+  useEffect(() => {
+    if (!focus) return;
+    composerRef.current?.querySelector<HTMLTextAreaElement>(".structured-input")?.focus();
+  }, [focus]);
+
+  const urls = imageUrls.current;
+  useEffect(
+    () => () => {
+      for (const url of urls.values()) URL.revokeObjectURL(url);
+      urls.clear();
+    },
+    [urls],
+  );
+
+  const turnActive = turnIsActive(state);
+  const pendingRowId = useMemo(() => pendingApprovalRowIdOf(rows, state), [rows, state]);
+  const items = useMemo(
+    () => transcriptItems(rows, pendingRowId, turnActive),
+    [rows, pendingRowId, turnActive],
+  );
+  const commands = useMemo(() => commandsFromTranscript(rows), [rows]);
+  const configOptions: AcpSessionConfigOption[] = state.config_options?.configOptions ?? [];
+
+  const active = turnActive || awaitingBegin !== null;
+
+  // Stop saying "Sending" once the turn the submission was waiting for has
+  // begun — or, when it was accepted but a replacement socket has
+  // re-snapshotted since, once that newer snapshot has landed. Without the
+  // second case a prompt accepted across a reconnect would say "Sending"
+  // forever.
+  useEffect(() => {
+    if (turnActive) {
+      setAwaitingBegin(null);
+    } else if (
+      awaitingBegin !== null &&
+      accepted.current?.generation === awaitingBegin &&
+      socketGeneration > accepted.current.socketGeneration
+    ) {
+      setAwaitingBegin(null);
+    }
+  }, [turnActive, awaitingBegin, socketGeneration]);
+
+  useEffect(() => {
+    if (!active) optimisticStart.current = null;
+  }, [active]);
+
+  // Keep the pane pinned to the newest row unless the operator scrolled away.
+  useLayoutEffect(() => {
+    const el = scrollRef.current;
+    if (!el || !followingBottom.current) return;
+    el.scrollTop = Math.max(0, el.scrollHeight - el.clientHeight);
+  }, [items, active, queue]);
+
+  useEffect(() => {
+    if (!active) return;
+    const timer = window.setInterval(() => setNow(Date.now()), 1_000);
+    return () => window.clearInterval(timer);
+  }, [active]);
+
+  const onScroll = () => {
+    const el = scrollRef.current;
+    if (!el) return;
+    followingBottom.current = el.scrollHeight - el.clientHeight - el.scrollTop <= FOLLOW_BOTTOM_THRESHOLD_PX;
+  };
+
+  const decide = useCallback(
+    async (rowId: string, decision: StructuredApprovalDecision): Promise<void> => {
+      const nonce = state.pending_approval?.nonce;
+      // Already resolved elsewhere between the click and here. A stale nonce
+      // is a no-op, not an error (docs/STRUCTURED-VIEW.md: any nonce answers
+      // 204), and the row's buttons are already gone — resolve quietly.
+      if (!nonce || rowId !== pendingRowId) return;
+      try {
+        await resolveStructuredApproval(sessionId, nonce, decision);
+      } catch (e: unknown) {
+        // Propagate — so the row re-enables its buttons — only while this is
+        // still the pending approval. If it moved on in flight, reviving the
+        // buttons would revive a decision that no longer applies.
+        setError(String(e));
+        throw e;
+      }
+    },
+    [sessionId, state.pending_approval?.nonce, pendingRowId],
+  );
+
+  const dispatchPrompt = useCallback(
+    (text: string, files: File[]) => {
+      const generation = ++submission.current;
+      const submissionSocket = socketGeneration;
+      setAwaitingBegin(generation);
+      optimisticStart.current = Date.now();
+      accepted.current = null;
+      promptPending.current = true;
+      setUploading(files.length > 0);
+      setDraft("");
+      setError(null);
+
+      const send = async () => {
+        const references: string[] = [];
+        for (const file of files) {
+          const { path } = await uploadStructuredFile(sessionId, file);
+          if (file.type.startsWith("image/")) imageUrls.current.set(path, URL.createObjectURL(file));
+          references.push(`Attached file ${JSON.stringify(file.name)}: ${JSON.stringify(path)}`);
+        }
+        await sendStructuredPrompt(sessionId, [text, ...references].filter(Boolean).join("\n\n"));
+      };
+
+      void send().then(
+        () => {
+          promptPending.current = false;
+          if (generation !== submission.current) return;
+          setUploading(false);
+          setAttachments((current) => (current === files ? [] : current));
+          accepted.current = { generation, socketGeneration };
+          // A replacement socket may have captured idle before the POST
+          // claimed the prompt. Reconnect so its snapshot cannot predate the
+          // 204.
+          if (socketGeneration > submissionSocket) session.reconnect();
+        },
+        (e: unknown) => {
+          promptPending.current = false;
+          if (generation !== submission.current) return;
+          setAwaitingBegin((current) => (current === generation ? null : current));
+          optimisticStart.current = null;
+          setUploading(false);
+          // The draft and its attachments are the operator's work — a failed
+          // send hands both back rather than eating them.
+          setAttachments((current) => (current.length === 0 ? files : current));
+          setDraft((current) => (current === "" ? text : current));
+          setError(String(e));
+        },
+      );
+    },
+    [sessionId, socketGeneration, session],
+  );
+
+  // A queued message goes out as soon as the projected turn is idle — the
+  // daemon answers a second prompt `409 turn_in_flight`, so the queue is
+  // client-local (docs/STRUCTURED-VIEW.md).
+  useEffect(() => {
+    if (active || promptPending.current || queue.length === 0) return;
+    const [next, ...rest] = queue;
+    setQueue(rest);
+    dispatchPrompt(next.text, next.attachments);
+  }, [active, queue, dispatchPrompt]);
+
+  const submit = (text: string, files: File[]) => {
+    if (active || queue.length > 0) {
+      setQueue((current) => [...current, { text, attachments: files }]);
+      setAttachments([]);
+      setDraft("");
+      setError(null);
+      return;
+    }
+    dispatchPrompt(text, files);
+  };
+
+  const cancel = () => {
+    setError(null);
+    cancelStructuredTurn(sessionId).catch((e: unknown) => setError(String(e)));
+  };
+
+  const changeConfig = (option: AcpSessionConfigOption, value: string | boolean) => {
+    setConfigBusy(true);
+    setError(null);
+    setStructuredConfig(sessionId, { config_id: option.id, value })
+      .catch((e: unknown) =>
+        setError(e instanceof Error ? e.message : "Could not change the session setting"),
+      )
+      .finally(() => setConfigBusy(false));
+  };
+
+  const elapsedMs = () => {
+    const authoritative = state.turn.started_at ? Date.parse(state.turn.started_at) : Number.NaN;
+    const startedAt = Number.isFinite(authoritative) ? authoritative : optimisticStart.current;
+    return startedAt === null ? 0 : Math.max(0, now - startedAt);
+  };
+
+  const activityLabel = () => {
+    const tools = state.turn.active_tool_calls.length;
+    const label = awaitingBegin !== null
+      ? "Sending"
+      : state.turn.thinking
+        ? "Thinking"
+        : tools > 0
+          ? `Running ${tools} ${tools === 1 ? "tool" : "tools"}`
+          : "Responding";
+    const parts = [label, formatElapsed(elapsedMs())];
+    if (typeof state.usage?.used === "number") {
+      const usage = formatContextTokens(state.usage.used);
+      parts.push(
+        typeof state.usage.size === "number" ? `${usage} / ${formatContextTokens(state.usage.size)}` : usage,
+      );
+    }
+    return parts.join(" · ");
+  };
+
+  const setRowExpanded = (id: string, expanded: boolean) =>
+    setExpandedRows((current) => {
+      const next = new Set(current);
+      if (expanded) next.add(id);
+      else next.delete(id);
+      return next;
+    });
+
+  const setGroupExpanded = (id: string, expanded: boolean) =>
+    setExpandedGroups((current) => {
+      const next = new Set(current);
+      if (expanded) next.add(id);
+      else next.delete(id);
+      return next;
+    });
+
+  const renderRow = (row: Row) => (
+    <TranscriptRow
+      key={row.id}
+      row={row}
+      pendingApproval={row.id === pendingRowId}
+      onDecide={(decision) => decide(row.id, decision)}
+      expanded={expandedRows.has(row.id)}
+      onExpandedChange={(expanded) => setRowExpanded(row.id, expanded)}
+      imageUrls={imageUrls.current}
+    />
+  );
+
+  return (
+    <div className={className ? `structured-pane ${className}` : "structured-pane"}>
+      <div className="structured-body">
+        <div className="structured-main">
+          <div className="structured-scroll" ref={scrollRef} onScroll={onScroll}>
+            <div className="structured-rows">
+              {items.map((item) =>
+                item.type === "row" ? (
+                  renderRow(item.row)
+                ) : (
+                  <ToolGroup
+                    key={item.id}
+                    id={item.id}
+                    toolCount={item.group.toolCount}
+                    expanded={expandedGroups.has(item.id)}
+                    onExpandedChange={(expanded) => setGroupExpanded(item.id, expanded)}
+                  >
+                    {item.group.rows.map(renderRow)}
+                  </ToolGroup>
+                ),
+              )}
+              {queue.map((queued, index) => (
+                <div key={`queued-${index}`} className="st-row st-row-queued">
+                  <div className="st-body">
+                    <div className="st-user-text">{queued.text}</div>
+                  </div>
+                </div>
+              ))}
+            </div>
+            <div className="structured-activity" role="status" aria-live="polite" hidden={!active}>
+              <span className="structured-activity-pulse" aria-hidden="true" />
+              <span className="structured-activity-text">{active ? activityLabel() : ""}</span>
+            </div>
+          </div>
+          {error !== null && <div className="structured-error">{error}</div>}
+          <div ref={composerRef}>
+            <Composer
+              attachments={attachments}
+              onAttachmentsChange={setAttachments}
+              commands={commands}
+              configOptions={configOptions}
+              turnActive={active}
+              uploading={uploading}
+              configBusy={configBusy}
+              draft={draft}
+              onDraftChange={setDraft}
+              onSubmit={submit}
+              onCancel={cancel}
+              onConfigChange={changeConfig}
+              onError={setError}
+              menuId={`structured-command-menu-${sessionId}`}
+            />
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+});

web/src/components/structured/ToolGroup.tsx

@@ -0,0 +1,43 @@
+// A turn's collapsed activity block: two or more tool rows after the same
+// `User` row, plus the narration absorbed between them. The header counts tool
+// rows only (docs/STRUCTURED-VIEW.md); opening it reveals tools and text in
+// chronological order.
+
+import type { ReactNode } from "react";
+
+export interface ToolGroupProps {
+  id: string;
+  toolCount: number;
+  expanded: boolean;
+  onExpandedChange(expanded: boolean): void;
+  children: ReactNode;
+}
+
+export function ToolGroup({ id, toolCount, expanded, onExpandedChange, children }: ToolGroupProps) {
+  return (
+    <div className="st-tool-group" data-tool-group-id={id}>
+      <button
+        type="button"
+        className="st-tool-group-head"
+        aria-expanded={expanded}
+        onClick={() => onExpandedChange(!expanded)}
+      >
+        <span className="st-tool-group-glyph" aria-hidden="true">
+          ›
+        </span>
+        <span className="st-tool-group-title">{`${toolCount} tool calls`}</span>
+      </button>
+      <div
+        className={
+          expanded ? "st-tool-group-body st-disclosure is-expanded" : "st-tool-group-body st-disclosure"
+        }
+        aria-hidden={!expanded}
+        inert={!expanded}
+      >
+        <div className="st-disclosure-clip">
+          <div className="st-disclosure-inner">{children}</div>
+        </div>
+      </div>
+    </div>
+  );
+}

web/src/components/structured/ToolIcon.tsx

@@ -0,0 +1,35 @@
+// The glyph column of a tool row's head. Recognition is narrow on purpose: an
+// unrecognised or absent `ToolKind` gets the generic bullet, never a blank
+// column and never a mark that stands for the wrong kind of work.
+
+import type { AcpToolKind } from "../../types.js";
+
+/** Glyph shown in a tool row's head, by `ToolKind`. */
+const KIND_GLYPH: Record<string, string> = {
+  read: "≡",
+  edit: "±",
+  delete: "✕",
+  move: "→",
+  search: "⌕",
+  execute: "$",
+  think: "…",
+  fetch: "⇣",
+  switch_mode: "⇄",
+};
+
+export function toolGlyph(kind: string | undefined): string {
+  return (kind && KIND_GLYPH[kind]) || "•";
+}
+
+export interface ToolIconProps {
+  kind: AcpToolKind | string | undefined;
+  className?: string;
+}
+
+export function ToolIcon({ kind, className = "st-tool-glyph" }: ToolIconProps) {
+  return (
+    <span className={className} aria-hidden="true">
+      {toolGlyph(kind)}
+    </span>
+  );
+}

web/src/components/structured/TranscriptRow.tsx

@@ -0,0 +1,387 @@
+// One transcript row, by kind. docs/STRUCTURED-VIEW.md fixes the eight kinds
+// and leaves every rendering decision here: markdown for AgentText, an inline
+// italic stream for AgentThought, a tool card for ToolCall/ToolDiff, a diff
+// view for ToolDiff's content, an approval card for Approval, and an opaque
+// collapsed line for a Notice nobody has taught the client about. `Plan` is
+// deliberately not drawn — the web client has no plan rail.
+
+import { useEffect, useRef, type ReactNode } from "react";
+
+import { renderInlineMarkdown, renderMarkdown, formatElapsed } from "./render.js";
+import type {
+  AcpContentBlock,
+  AcpPermissionOption,
+  AcpToolCallContent,
+  AcpToolCallLike,
+  StructuredApprovalDecision,
+  TranscriptRow as Row,
+  TurnMeta,
+} from "../../types.js";
+import { ApprovalView } from "./ApprovalView.js";
+import { Copyable } from "./Copyable.js";
+import { DiffView } from "./DiffView.js";
+import {
+  contentBlockText,
+  isStateOnlyNotice,
+  splitToolTitle,
+  statusMeta,
+  toolDiffMeta,
+  turnMeta,
+} from "./model.js";
+import { safeMediaSource, toolPayload } from "./toolPayload.js";
+import { ToolIcon } from "./ToolIcon.js";
+
+// ---------------------------------------------------------------------------
+// content rows: user / agent / thought
+// ---------------------------------------------------------------------------
+
+/** Model-authored markdown, sanitized by render.ts before it enters
+ *  the DOM. Tables get their own scroller and links open out of the app. */
+function Prose({ html }: { html: string }) {
+  const ref = useRef<HTMLDivElement | null>(null);
+  useEffect(() => {
+    const container = ref.current;
+    if (!container) return;
+    for (const table of Array.from(container.querySelectorAll("table"))) {
+      if (table.parentElement?.classList.contains("st-markdown-table-wrap")) continue;
+      const scroller = document.createElement("div");
+      scroller.className = "st-markdown-table-wrap";
+      table.replaceWith(scroller);
+      scroller.appendChild(table);
+    }
+    for (const link of container.querySelectorAll("a")) {
+      link.target = "_blank";
+      link.rel = "noopener noreferrer";
+    }
+  }, [html]);
+  return <div ref={ref} className="st-body" dangerouslySetInnerHTML={{ __html: html }} />;
+}
+
+export interface ContentRowProps {
+  row: Row;
+  variant: "user" | "agent" | "thought";
+  /** Object URLs for images this prompt uploaded, keyed by the server path the
+   *  row's text names. */
+  imageUrls?: Map<string, string>;
+}
+
+/** `Attached file "name": "path"` references the composer appends on send. */
+const ATTACHED_FILE_RE = /Attached file "(?:[^"\\]|\\.)*": "((?:[^"\\]|\\.)*)"/g;
+
+function attachedImages(text: string, imageUrls: Map<string, string>): string[] {
+  const urls: string[] = [];
+  ATTACHED_FILE_RE.lastIndex = 0;
+  let match: RegExpExecArray | null;
+  while ((match = ATTACHED_FILE_RE.exec(text)) !== null) {
+    let serverPath: string;
+    try {
+      serverPath = JSON.parse(`"${match[1]}"`) as string;
+    } catch {
+      continue;
+    }
+    const url = imageUrls.get(serverPath);
+    if (url) urls.push(url);
+  }
+  return urls;
+}
+
+export function ContentRow({ row, variant, imageUrls }: ContentRowProps) {
+  const data = row.data as { content?: AcpContentBlock } | undefined;
+  const text = contentBlockText(data?.content);
+  const displayText = variant === "thought" ? text.trim() : text;
+  const label = variant === "user" ? "message" : variant === "agent" ? "response" : "thought";
+
+  let body: ReactNode;
+  if (variant === "user") {
+    const images = imageUrls && imageUrls.size > 0 ? attachedImages(displayText, imageUrls) : [];
+    // With previews in hand the path references are noise — the image is the
+    // attachment. Without them the text is all the operator has, so it stays.
+    const shown =
+      images.length > 0
+        ? displayText.replace(/\n\nAttached file "[^"]*": "[^"]*"/g, "").trim()
+        : displayText;
+    body = (
+      <div className="st-body">
+        {shown && <div className="st-user-text">{shown}</div>}
+        {images.map((src) => (
+          <img key={src} className="st-user-image" src={src} alt="Uploaded image" loading="lazy" />
+        ))}
+      </div>
+    );
+  } else if (variant === "agent") {
+    body = <Prose html={renderMarkdown(displayText)} />;
+  } else {
+    body = <div className="st-body" dangerouslySetInnerHTML={{ __html: renderInlineMarkdown(displayText) }} />;
+  }
+
+  return (
+    <Copyable className={`st-row st-row-${variant}`} text={displayText} label={label} data-row-id={row.id}>
+      {body}
+    </Copyable>
+  );
+}
+
+// ---------------------------------------------------------------------------
+// tool rows
+// ---------------------------------------------------------------------------
+
+function ToolDetailBlock({ label, text }: { label: string; text: string }) {
+  return (
+    <div className="st-tool-detail">
+      <div className="st-tool-detail-label">{label}</div>
+      <Copyable as="pre" text={text} label={label.toLowerCase()}>
+        {text}
+      </Copyable>
+    </div>
+  );
+}
+
+function ContentBlockView({ block }: { block: AcpContentBlock }) {
+  if (block.type === "text") {
+    if (!block.text) return null;
+    return (
+      <Copyable className="st-tool-text" text={block.text} label="output">
+        {block.text}
+      </Copyable>
+    );
+  }
+  if (block.type === "image") {
+    const source = safeMediaSource(block.mimeType, block.data, "image");
+    if (source) return <img className="st-tool-image" src={source} alt="Tool output" loading="lazy" />;
+    return <ToolDetailBlock label="Image" text={block.uri ?? block.mimeType ?? "Unavailable"} />;
+  }
+  if (block.type === "audio") {
+    const source = safeMediaSource(block.mimeType, block.data, "audio");
+    if (source) return <audio className="st-tool-audio" controls src={source} />;
+    return <ToolDetailBlock label="Audio" text={block.mimeType ?? "Unavailable"} />;
+  }
+  if (block.type === "resource_link") {
+    return (
+      <div className="st-tool-resource">
+        <span className="st-tool-resource-name">{block.title ?? block.name ?? "Resource"}</span>
+        {block.uri && (
+          <Copyable as="code" className="st-tool-resource-uri" text={block.uri} label="resource URI">
+            {block.uri}
+          </Copyable>
+        )}
+        {block.description && <span className="st-tool-resource-description">{block.description}</span>}
+      </div>
+    );
+  }
+  const resource = block.resource;
+  if (typeof resource?.text === "string") {
+    return (
+      <ToolDetailBlock label={resource.uri ? `Resource · ${resource.uri}` : "Resource"} text={resource.text} />
+    );
+  }
+  const printed = resource === undefined ? "" : JSON.stringify(resource, null, 2);
+  return printed ? <ToolDetailBlock label="Resource" text={printed} /> : null;
+}
+
+function ToolBody({ tool, content }: { tool: AcpToolCallLike; content: AcpToolCallContent[] }) {
+  const payload = toolPayload(tool, content);
+  const hasRaw = payload.raw.input !== null || payload.raw.output !== null;
+  return (
+    <>
+      {content.map((block, index) => {
+        if (block.type === "content") return <ContentBlockView key={index} block={block.content} />;
+        if (block.type === "diff") return <DiffView key={index} diff={block} />;
+        return (
+          <div key={index} className="st-tool-terminal">
+            {block.terminalId ? `Terminal · ${block.terminalId}` : "Embedded terminal"}
+          </div>
+        );
+      })}
+      {payload.details.map((detail, index) => (
+        <ToolDetailBlock key={`${detail.label}-${index}`} label={detail.label} text={detail.text} />
+      ))}
+      {payload.exitCode !== null && (
+        <div className="st-tool-fact">
+          <span className="st-tool-fact-label">Exit code</span>
+          <code className={payload.exitCode === 0 ? "st-tool-exit-ok" : "st-tool-exit-failed"}>
+            {payload.exitCode}
+          </code>
+        </div>
+      )}
+      {hasRaw && (
+        <details className="st-tool-raw">
+          <summary>Raw JSON</summary>
+          <div className="st-tool-raw-body">
+            {payload.raw.input !== null && <ToolDetailBlock label="Input" text={payload.raw.input} />}
+            {payload.raw.output !== null && <ToolDetailBlock label="Output" text={payload.raw.output} />}
+          </div>
+        </details>
+      )}
+    </>
+  );
+}
+
+/** True when a tool call has anything at all to disclose — a head with nothing
+ *  behind it stays a plain line rather than an empty disclosure. */
+function hasToolBody(tool: AcpToolCallLike, content: AcpToolCallContent[]): boolean {
+  if (content.length > 0) return true;
+  const payload = toolPayload(tool, content);
+  return payload.details.length > 0 || payload.exitCode !== null || payload.raw.input !== null || payload.raw.output !== null;
+}
+
+export interface ToolRowProps {
+  row: Row;
+  expanded: boolean;
+  onExpandedChange(expanded: boolean): void;
+}
+
+export function ToolRow({ row, expanded, onExpandedChange }: ToolRowProps) {
+  const tool = (row.data ?? {}) as AcpToolCallLike;
+  const content = tool.content ?? [];
+  const hasDiff = content.some((c) => c.type === "diff");
+  const { label, arg } = splitToolTitle(tool.title, tool.name, tool.kind);
+  const meta = statusMeta(tool.status, hasDiff);
+  const metaParts: string[] = [];
+  if (hasDiff) metaParts.push(toolDiffMeta(content));
+  if (meta) metaParts.push(meta.text);
+  const disclosable = hasToolBody(tool, content);
+  const open = expanded && disclosable;
+
+  return (
+    <div className="st-row st-row-tool" data-row-id={row.id}>
+      <div className="st-tool">
+        <button
+          type="button"
+          className="st-tool-head"
+          aria-expanded={open}
+          onClick={() => disclosable && onExpandedChange(!open)}
+        >
+          <ToolIcon kind={tool.kind} />
+          <span className="st-tool-name">{label}</span>
+          <span className="st-tool-arg" title={arg}>
+            {arg}
+          </span>
+          {metaParts.length > 0 && (
+            <span className={meta ? `st-tool-meta st-tool-meta-${meta.kind}` : "st-tool-meta"}>
+              {metaParts.join(" · ")}
+            </span>
+          )}
+        </button>
+        {disclosable && (
+          <div
+            className={open ? "st-tool-out st-disclosure is-expanded" : "st-tool-out st-disclosure"}
+            aria-hidden={!open}
+            inert={!open}
+          >
+            <div className="st-disclosure-clip">
+              <div className="st-disclosure-inner">
+                {/* Built only once opened: a long transcript would otherwise
+                    render every tool's whole output up front. */}
+                {open && <ToolBody tool={tool} content={content} />}
+              </div>
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+// ---------------------------------------------------------------------------
+// notices and turn footers
+// ---------------------------------------------------------------------------
+
+function compactNumber(value: number): string {
+  if (Math.abs(value) < 1_000) return String(value);
+  if (Math.abs(value) < 1_000_000) return `${(value / 1_000).toFixed(value % 1_000 === 0 ? 0 : 1)}k`;
+  return `${(value / 1_000_000).toFixed(value % 1_000_000 === 0 ? 0 : 1)}m`;
+}
+
+export function TurnMetaRow({ meta }: { meta: TurnMeta }) {
+  const parts = [formatElapsed(meta.elapsedMs)];
+  if (typeof meta.contextDelta === "number") {
+    const sign = meta.contextDelta > 0 ? "+" : "";
+    parts.push(`${sign}${compactNumber(meta.contextDelta)} context tokens`);
+  } else if (typeof meta.contextTokens === "number") {
+    parts.push(`${compactNumber(meta.contextTokens)} context`);
+  }
+  if (meta.model) parts.push(meta.model);
+  if (meta.outcome !== "completed") parts.push(meta.outcome);
+  const text = parts.join(" · ");
+  return (
+    <Copyable
+      className={`st-turn-meta st-turn-meta-${meta.outcome}`}
+      text={text}
+      label="turn details"
+      aria-label={`Turn ${meta.outcome}`}
+    >
+      <span className="st-turn-meta-dot" aria-hidden="true" />
+      <span>{text}</span>
+    </Copyable>
+  );
+}
+
+/** The floor presentation docs/STRUCTURED-VIEW.md allows for a `Notice` the
+ *  client has nothing better to do with: an opaque, collapsed line. */
+export function NoticeRow({ row }: { row: Row }) {
+  const text = `[${row.kind}]`;
+  return (
+    <Copyable className="st-row st-row-notice" text={text} label="notice" data-row-id={row.id}>
+      <div className="st-body">{text}</div>
+    </Copyable>
+  );
+}
+
+// ---------------------------------------------------------------------------
+// dispatch
+// ---------------------------------------------------------------------------
+
+export interface TranscriptRowProps {
+  row: Row;
+  /** This row is the one live approval (docs/STRUCTURED-VIEW.md's nonce
+   *  rules). Every other approval row is history. */
+  pendingApproval?: boolean;
+  onDecide?: (decision: StructuredApprovalDecision) => Promise<void>;
+  expanded?: boolean;
+  onExpandedChange?: (expanded: boolean) => void;
+  imageUrls?: Map<string, string>;
+}
+
+/** One transcript row, or `null` for the rows the web client omits (`plan`,
+ *  and the state-only notices it consumes for `/` autocomplete). */
+export function TranscriptRow({
+  row,
+  pendingApproval = false,
+  onDecide,
+  expanded = false,
+  onExpandedChange,
+  imageUrls,
+}: TranscriptRowProps) {
+  switch (row.kind) {
+    case "user":
+      return <ContentRow row={row} variant="user" imageUrls={imageUrls} />;
+    case "agent_text":
+      return <ContentRow row={row} variant="agent" />;
+    case "agent_thought":
+      return <ContentRow row={row} variant="thought" />;
+    case "tool_call":
+    case "tool_diff":
+      return (
+        <ToolRow row={row} expanded={expanded} onExpandedChange={(next) => onExpandedChange?.(next)} />
+      );
+    case "approval": {
+      const request = (row.data ?? {}) as { toolCall?: AcpToolCallLike; options?: AcpPermissionOption[] };
+      return (
+        <ApprovalView
+          request={request}
+          pending={pendingApproval}
+          onDecide={onDecide ?? (() => Promise.resolve())}
+        />
+      );
+    }
+    case "plan":
+      return null;
+    case "notice": {
+      if (isStateOnlyNotice(row)) return null;
+      const meta = turnMeta(row);
+      return meta ? <TurnMetaRow meta={meta} /> : <NoticeRow row={row} />;
+    }
+    default:
+      return <NoticeRow row={row} />;
+  }
+}

web/src/components/structured/diff.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 
-import { computeDiffLines, diffStats, type DiffLine } from "./structuredDiff.js";
+import { computeDiffLines, diffStats, type DiffLine } from "./diff.js";
 
 function texts(lines: DiffLine[]): Array<[string, string]> {
   return lines.map((l) => [l.kind, l.text]);

web/src/components/structured/index.ts

@@ -0,0 +1,13 @@
+export { StructuredPane, type StructuredPaneHandle, type StructuredPaneProps } from "./StructuredPane.js";
+export { TranscriptRow, type TranscriptRowProps } from "./TranscriptRow.js";
+export { DiffView, type DiffViewProps } from "./DiffView.js";
+export { ApprovalView, type ApprovalViewProps } from "./ApprovalView.js";
+export { ToolGroup, type ToolGroupProps } from "./ToolGroup.js";
+export { ToolIcon, toolGlyph, type ToolIconProps } from "./ToolIcon.js";
+export { Composer, type ComposerProps } from "./Composer.js";
+export {
+  useStructuredSession,
+  type StructuredSession,
+  type StructuredSocketFactory,
+  type StructuredStatus,
+} from "./useStructuredSession.js";

web/src/components/structured/model.test.ts

@@ -0,0 +1,252 @@
+import { describe, expect, it } from "vitest";
+
+import type { ReducedState, TranscriptRow } from "../../types.js";
+import {
+  activityGroupsByTurn,
+  applyCommand,
+  commandsFromTranscript,
+  commandTokenAt,
+  contentBlockText,
+  filterCommands,
+  isStateOnlyNotice,
+  offeredDecisions,
+  orderConfigOptions,
+  pendingApprovalRowId,
+  splitToolTitle,
+  statusMeta,
+  toolDiffMeta,
+  toolKindLabel,
+  transcriptItems,
+  turnMeta,
+} from "./model.js";
+
+function row(id: string, kind: TranscriptRow["kind"], data: unknown = {}): TranscriptRow {
+  return { id, kind, data };
+}
+
+function tool(id: string): TranscriptRow {
+  return row(id, "tool_call", { title: `Read(${id})`, status: "completed" });
+}
+
+function text(id: string, kind: "user" | "agent_text" | "agent_thought", body: string): TranscriptRow {
+  return row(id, kind, { content: { type: "text", text: body } });
+}
+
+const idle: ReducedState = { turn: { responding: false, thinking: false, active_tool_calls: [] } };
+
+describe("row taxonomy", () => {
+  it("splits an adapter's Name(argument) title, and falls back to the kind", () => {
+    expect(splitToolTitle("Read(src/main.ts)", null, "read")).toEqual({ label: "Read", arg: "src/main.ts" });
+    expect(splitToolTitle("something opaque", null, "search")).toEqual({
+      label: "Search",
+      arg: "something opaque",
+    });
+    expect(splitToolTitle(undefined, null, undefined)).toEqual({ label: "Tool", arg: "" });
+  });
+
+  it("labels an unknown tool kind rather than leaving it blank", () => {
+    expect(toolKindLabel("execute")).toBe("Execute");
+    expect(toolKindLabel("no_such_kind")).toBe("Tool");
+    expect(toolKindLabel(undefined)).toBe("Tool");
+  });
+
+  it("names non-text content blocks instead of dropping them", () => {
+    expect(contentBlockText({ type: "text", text: "hi" })).toBe("hi");
+    expect(contentBlockText({ type: "image" })).toBe("[image]");
+    expect(contentBlockText({ type: "resource_link", name: "spec.md" })).toBe("[resource: spec.md]");
+    expect(contentBlockText(undefined)).toBe("");
+  });
+
+  it("counts a tool call's diff lines", () => {
+    expect(toolDiffMeta([{ type: "diff", path: "a.ts", oldText: "one\ntwo\n", newText: "one\nTWO\nthree\n" }]))
+      .toBe("+2 −1");
+    expect(toolDiffMeta([])).toBe("+0 −0");
+  });
+
+  it("shows a status only while it is worth showing", () => {
+    expect(statusMeta("in_progress", false)).toEqual({ text: "running", kind: "running" });
+    expect(statusMeta("failed", true)).toEqual({ text: "failed", kind: "failed" });
+    expect(statusMeta("pending", true)).toBeNull(); // the diff counts already say it
+    expect(statusMeta("completed", false)).toBeNull();
+  });
+});
+
+describe("notices", () => {
+  it("reads a maestroTurnMeta footer, and only a well-formed one", () => {
+    const meta = { elapsedMs: 4200, outcome: "completed", model: "sonnet" };
+    expect(turnMeta(row("n1", "notice", { maestroTurnMeta: meta }))).toEqual(meta);
+    expect(turnMeta(row("n2", "notice", { maestroTurnMeta: { outcome: "completed" } }))).toBeNull();
+    expect(turnMeta(row("n3", "notice", { sessionUpdate: "session_info_update" }))).toBeNull();
+  });
+
+  it("marks the state-only notices the client consumes rather than shows", () => {
+    expect(isStateOnlyNotice(row("n1", "notice", { sessionUpdate: "available_commands_update" }))).toBe(true);
+    expect(isStateOnlyNotice(row("n2", "notice", { sessionUpdate: "session_info_update" }))).toBe(true);
+    expect(isStateOnlyNotice(row("n3", "notice", { sessionUpdate: "something_else" }))).toBe(false);
+  });
+});
+
+describe("approvals", () => {
+  it("offers only decisions the request actually backs", () => {
+    expect(
+      offeredDecisions([
+        { optionId: "a", name: "Allow once", kind: "allow_once" },
+        { optionId: "r", name: "Reject", kind: "reject_once" },
+      ]),
+    ).toEqual(["allow_once", "deny"]);
+    expect(offeredDecisions([{ optionId: "a", name: "Always", kind: "allow_always" }])).toEqual([
+      "allow_for_session",
+    ]);
+    expect(offeredDecisions([])).toEqual([]);
+  });
+
+  it("points a live pending approval at the newest approval row", () => {
+    const rows = [row("approval:1", "approval"), tool("tool:1"), row("approval:2", "approval")];
+    const pending: ReducedState = {
+      ...idle,
+      pending_approval: { nonce: "n", request: {} as never },
+    };
+    expect(pendingApprovalRowId(rows, pending)).toBe("approval:2");
+    expect(pendingApprovalRowId(rows, idle)).toBeNull();
+  });
+});
+
+describe("activity grouping", () => {
+  it("groups a turn's tools once there are two of them", () => {
+    const rows = [text("user:1", "user", "go"), tool("tool:1"), tool("tool:2")];
+    const groups = activityGroupsByTurn(rows, null, false);
+    expect([...groups.keys()]).toEqual(["turn:user:1"]);
+    expect(groups.get("turn:user:1")).toMatchObject({ toolCount: 2 });
+  });
+
+  it("leaves a single tool call standalone", () => {
+    const rows = [text("user:1", "user", "go"), tool("tool:1")];
+    expect(activityGroupsByTurn(rows, null, false).size).toBe(0);
+  });
+
+  it("absorbs intermediate narration but keeps the final answer outside", () => {
+    const rows = [
+      text("user:1", "user", "go"),
+      tool("tool:1"),
+      text("agent:1", "agent_text", "working"),
+      tool("tool:2"),
+      text("agent:2", "agent_text", "done"),
+    ];
+    const group = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
+    expect(group.rows.map((r) => r.id)).toEqual(["tool:1", "agent:1", "tool:2"]);
+    expect(group.toolCount).toBe(2);
+  });
+
+  it("keeps the newest thought outside while the turn is still live", () => {
+    const rows = [
+      text("user:1", "user", "go"),
+      tool("tool:1"),
+      tool("tool:2"),
+      text("thought:1", "agent_thought", "hmm"),
+      text("thought:2", "agent_thought", "aha"),
+    ];
+    const live = activityGroupsByTurn(rows, null, true).get("turn:user:1")!;
+    expect(live.rows.map((r) => r.id)).toEqual(["tool:1", "tool:2", "thought:1"]);
+    const ended = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
+    expect(ended.rows.map((r) => r.id)).toEqual(["tool:1", "tool:2", "thought:1", "thought:2"]);
+  });
+
+  it("absorbs a resolved approval, never the pending one", () => {
+    const rows = [
+      text("user:1", "user", "go"),
+      tool("tool:1"),
+      row("approval:1", "approval"),
+      tool("tool:2"),
+      row("approval:2", "approval"),
+      tool("tool:3"),
+    ];
+    const group = activityGroupsByTurn(rows, "approval:2", false).get("turn:user:1")!;
+    expect(group.rows.map((r) => r.id)).toEqual(["tool:1", "approval:1", "tool:2", "tool:3"]);
+  });
+});
+
+describe("transcript render list", () => {
+  it("renders a group once, at its first member's position", () => {
+    const rows = [text("user:1", "user", "go"), tool("tool:1"), tool("tool:2"), text("agent:1", "agent_text", "done")];
+    const items = transcriptItems(rows, null, false);
+    expect(items.map((item) => (item.type === "row" ? item.row.id : item.id))).toEqual([
+      "user:1",
+      "turn:user:1",
+      "agent:1",
+    ]);
+  });
+
+  it("omits plan rows, state-only notices and standalone resolved approvals", () => {
+    const rows = [
+      text("user:1", "user", "go"),
+      row("plan", "plan", { entries: [] }),
+      row("notice:1", "notice", { sessionUpdate: "available_commands_update", availableCommands: [] }),
+      row("approval:1", "approval"),
+      text("agent:1", "agent_text", "done"),
+    ];
+    const items = transcriptItems(rows, null, false);
+    expect(items.map((item) => (item.type === "row" ? item.row.id : item.id))).toEqual(["user:1", "agent:1"]);
+  });
+
+  it("keeps a turn footer only while it is the final item", () => {
+    const footer = row("turn_meta:1", "notice", { maestroTurnMeta: { elapsedMs: 10, outcome: "completed" } });
+    expect(transcriptItems([text("user:1", "user", "go"), footer], null, false)).toHaveLength(2);
+    const later = [text("user:1", "user", "go"), footer, text("user:2", "user", "again")];
+    expect(transcriptItems(later, null, false).map((i) => (i.type === "row" ? i.row.id : i.id))).toEqual([
+      "user:1",
+      "user:2",
+    ]);
+  });
+});
+
+describe("composer commands", () => {
+  const notice = row("notice:9", "notice", {
+    sessionUpdate: "available_commands_update",
+    availableCommands: [
+      { name: "compact", description: "Compact  the\n conversation" },
+      { name: "cost", description: "Show cost", input: { hint: "[period]" } },
+      { name: 42 },
+    ],
+  });
+
+  it("takes the newest available_commands_update, skipping malformed entries", () => {
+    const stale = row("notice:1", "notice", {
+      sessionUpdate: "available_commands_update",
+      availableCommands: [{ name: "old", description: "gone" }],
+    });
+    expect(commandsFromTranscript([stale, notice]).map((c) => c.name)).toEqual(["compact", "cost"]);
+    expect(commandsFromTranscript([])).toEqual([]);
+  });
+
+  it("only matches a /token under the caret", () => {
+    expect(commandTokenAt("/comp", 5, 5)).toEqual({ start: 0, end: 5, query: "comp" });
+    expect(commandTokenAt("hello /co there", 9, 9)).toEqual({ start: 6, end: 9, query: "co" });
+    expect(commandTokenAt("no slash", 3, 3)).toBeNull();
+    expect(commandTokenAt("/comp", 2, 5)).toBeNull(); // a selection is not a caret
+  });
+
+  it("ranks prefix matches ahead of substring matches", () => {
+    const commands = commandsFromTranscript([notice]);
+    expect(filterCommands(commands, "co").map((c) => c.name)).toEqual(["compact", "cost"]);
+    expect(filterCommands(commands, "act").map((c) => c.name)).toEqual(["compact"]);
+  });
+
+  it("replaces only the token under the caret", () => {
+    const token = commandTokenAt("say /co now", 7, 7)!;
+    expect(applyCommand("say /co now", token, "compact")).toEqual({ value: "say /compact now", cursor: 13 });
+    const trailing = commandTokenAt("/co", 3, 3)!;
+    expect(applyCommand("/co", trailing, "compact")).toEqual({ value: "/compact ", cursor: 9 });
+  });
+});
+
+describe("session config", () => {
+  it("orders the menu by category, unknown categories last", () => {
+    const options = [
+      { id: "d", category: null },
+      { id: "b", category: "thought_level" },
+      { id: "a", category: "model" },
+      { id: "c", category: "mode" },
+    ];
+    expect(orderConfigOptions(options).map((o) => o.id)).toEqual(["a", "b", "c", "d"]);
+  });
+});

web/src/components/structured/model.ts

@@ -0,0 +1,369 @@
+// Pure transcript logic for the structured pane (#246) — the decisions
+// docs/STRUCTURED-VIEW.md leaves to a client, kept out of the components so
+// they can be tested without a DOM or a socket. Ported from structured.ts's
+// private helpers and the parts of the old structuredRender.ts that were data, not
+// markup.
+
+import type {
+  AcpContentBlock,
+  AcpPermissionOption,
+  AcpToolCallContent,
+  ReducedState,
+  StructuredApprovalDecision,
+  TranscriptRow,
+  TranscriptRowKind,
+  TurnMeta,
+} from "../../types.js";
+import { computeDiffLines, diffStats } from "./diff.js";
+
+/** Human label behind a `ToolKind`. An unrecognised/absent kind is "Tool" —
+ *  never a blank label. */
+const KIND_LABEL: Record<string, string> = {
+  read: "Read",
+  edit: "Edit",
+  delete: "Delete",
+  move: "Move",
+  search: "Search",
+  execute: "Execute",
+  think: "Think",
+  fetch: "Fetch",
+  switch_mode: "Switch mode",
+};
+
+export function toolKindLabel(kind: string | undefined): string {
+  return (kind && KIND_LABEL[kind]) || "Tool";
+}
+
+/** Split a title into `{label, arg}` when it follows the adapter's own
+ *  `Name(argument)` convention; otherwise the whole title is the arg and the
+ *  tool's `kind` supplies a generic label. Never guesses at a shape the data
+ *  doesn't actually show. */
+export function splitToolTitle(
+  title: string | undefined,
+  name: string | null | undefined,
+  kind: string | undefined,
+): { label: string; arg: string } {
+  const label = name ?? toolKindLabel(kind);
+  if (!title) return { label, arg: "" };
+  const m = /^(\S+)\(([\s\S]*)\)$/.exec(title);
+  if (m) return { label: name ?? m[1], arg: m[2] };
+  return { label, arg: title };
+}
+
+/** Content-block text, or a labelled placeholder for anything that isn't
+ *  text — never dropped silently, never fabricated. */
+export function contentBlockText(block: AcpContentBlock | undefined): string {
+  if (!block) return "";
+  switch (block.type) {
+    case "text":
+      return block.text;
+    case "image":
+      return "[image]";
+    case "audio":
+      return "[audio]";
+    case "resource_link":
+      return `[resource: ${block.name ?? block.uri ?? "linked"}]`;
+    case "resource":
+      return "[resource]";
+    default:
+      return "";
+  }
+}
+
+/** `+added −removed` across every diff block in a tool call's content — real
+ *  derived data, never a fabricated duration. */
+export function toolDiffMeta(content: AcpToolCallContent[]): string {
+  let added = 0;
+  let removed = 0;
+  for (const block of content) {
+    if (block.type !== "diff") continue;
+    const stats = diffStats(computeDiffLines(block.oldText, block.newText));
+    added += stats.added;
+    removed += stats.removed;
+  }
+  return `+${added} −${removed}`;
+}
+
+export function statusMeta(
+  status: string | undefined,
+  hasDiff: boolean,
+): { text: string; kind: string } | null {
+  if (status === "in_progress") return { text: "running", kind: "running" };
+  if (status === "failed") return { text: "failed", kind: "failed" };
+  if (status === "pending" && !hasDiff) return { text: "pending", kind: "pending" };
+  return null;
+}
+
+/** The `maestroTurnMeta` footer a `Notice` row carries when it is a completed,
+ *  cancelled or failed turn's durable footer — `null` for every other notice. */
+export function turnMeta(row: TranscriptRow): TurnMeta | null {
+  if (row.kind !== "notice" || !row.data || typeof row.data !== "object") return null;
+  const value = (row.data as { maestroTurnMeta?: unknown }).maestroTurnMeta;
+  if (!value || typeof value !== "object") return null;
+  const meta = value as Partial<TurnMeta>;
+  if (typeof meta.elapsedMs !== "number" || typeof meta.outcome !== "string") return null;
+  return meta as TurnMeta;
+}
+
+/** Notices the web client consumes as state and omits from the visible
+ *  transcript (docs/STRUCTURED-VIEW.md, "A client decides"). */
+export function isStateOnlyNotice(row: TranscriptRow): boolean {
+  if (row.kind !== "notice" || !row.data || typeof row.data !== "object") return false;
+  const update = (row.data as { sessionUpdate?: string }).sessionUpdate;
+  return update === "available_commands_update" || update === "session_info_update";
+}
+
+/** Which decisions a permission request actually backs, by the
+ *  `PermissionOptionKind` values it offers (docs/STRUCTURED-VIEW.md's
+ *  "Decision mapping"). A decision with no matching option resolves
+ *  `Cancelled` server-side regardless of what the client sent — offering its
+ *  button would let the operator "allow" something that silently no-ops. */
+export function offeredDecisions(options: AcpPermissionOption[]): StructuredApprovalDecision[] {
+  const kinds = new Set(options.map((o) => o.kind));
+  const decisions: StructuredApprovalDecision[] = [];
+  if (kinds.has("allow_once")) decisions.push("allow_once");
+  if (kinds.has("allow_always")) decisions.push("allow_for_session");
+  if (kinds.has("reject_once") || kinds.has("reject_always")) decisions.push("deny");
+  return decisions;
+}
+
+/** The row id a live `pending_approval` names: the newest `Approval` row.
+ *  Only one approval is ever live (docs/STRUCTURED-VIEW.md, "One live
+ *  approval at a time"), so the last one is the pending one. */
+export function pendingApprovalRowId(rows: TranscriptRow[], state: ReducedState): string | null {
+  return state.pending_approval ? lastRowIdOfKind(rows, "approval") : null;
+}
+
+export function lastRowIdOfKind(rows: TranscriptRow[], kind: TranscriptRowKind): string | null {
+  for (let i = rows.length - 1; i >= 0; i--) if (rows[i].kind === kind) return rows[i].id;
+  return null;
+}
+
+export function turnIsActive(state: ReducedState): boolean {
+  return state.turn.responding || state.turn.thinking;
+}
+
+export interface ActivityGroup {
+  /** Header label count — tool rows only, never absorbed text. */
+  toolCount: number;
+  /** Tools plus absorbed intermediate text/approvals, in transcript order. */
+  rows: TranscriptRow[];
+}
+
+/**
+ * Group tool rows (and intermediate agent text / resolved approvals between
+ * them) by turn. An agent_text/agent_thought row is "intermediate" when a tool
+ * row follows it in the same turn — it gets absorbed into the group so the
+ * collapsed block preserves chronological order. Resolved approval rows (not
+ * the currently pending one) are absorbed the same way. The *last* agent text
+ * with no subsequent tool stays standalone (the prominent final answer).
+ *
+ * Returns groups keyed by `turn:<userId>`.
+ */
+export function activityGroupsByTurn(
+  rows: TranscriptRow[],
+  pendingApprovalId: string | null,
+  turnActive: boolean,
+): Map<string, ActivityGroup> {
+  // First: count tools per turn to know which turns qualify for grouping.
+  const toolCounts = new Map<string, number>();
+  let turnId = "before-first-message";
+  for (const row of rows) {
+    if (row.kind === "user") turnId = row.id;
+    if (row.kind !== "tool_call" && row.kind !== "tool_diff") continue;
+    const gid = `turn:${turnId}`;
+    toolCounts.set(gid, (toolCounts.get(gid) ?? 0) + 1);
+  }
+  // Second: build groups with interleaved text for turns with 2+ tools.
+  const groups = new Map<string, ActivityGroup>();
+  turnId = "before-first-message";
+  // Pending rows that might be intermediate (not yet confirmed by a following
+  // tool). If no tool follows, they stay standalone.
+  let pending: TranscriptRow[] = [];
+  let currentGid = `turn:${turnId}`;
+  for (const row of rows) {
+    if (row.kind === "user") {
+      turnId = row.id;
+      currentGid = `turn:${turnId}`;
+      pending = [];
+      continue;
+    }
+    const count = toolCounts.get(currentGid) ?? 0;
+    if (count < 2) continue;
+    const isIntermediateText = row.kind === "agent_text" || row.kind === "agent_thought";
+    const isResolvedApproval = row.kind === "approval" && row.id !== pendingApprovalId;
+    if (isIntermediateText || isResolvedApproval) {
+      pending.push(row);
+      continue;
+    }
+    if (row.kind === "tool_call" || row.kind === "tool_diff") {
+      const group = groups.get(currentGid) ?? { toolCount: count, rows: [] };
+      // Flush any pending rows — a tool follows, so they're intermediate.
+      group.rows.push(...pending);
+      pending = [];
+      group.rows.push(row);
+      groups.set(currentGid, group);
+    }
+  }
+  // A final agent text is the answer, so it stays outside. Thought rows are
+  // working commentary, though: when a turn already has a disclosure they
+  // belong with its activity even if the next tool call has not arrived yet.
+  // While the turn is still live the most recent one stays outside as visible
+  // narration (docs/STRUCTURED-VIEW.md), and is absorbed when the turn ends.
+  const lastGroup = groups.get(currentGid);
+  if (lastGroup && pending.length > 0 && pending.every((row) => row.kind === "agent_thought")) {
+    const absorb = turnActive ? pending.slice(0, -1) : pending;
+    lastGroup.rows.push(...absorb);
+  }
+
+  return groups;
+}
+
+/** One entry of the flattened render list: either a standalone row or a whole
+ *  activity group. */
+export type TranscriptItem =
+  | { type: "row"; row: TranscriptRow }
+  | { type: "group"; id: string; group: ActivityGroup };
+
+/**
+ * The transcript in render order: rows, with each turn's tool activity folded
+ * into a single group item where one exists. Resolved approvals not absorbed
+ * into a group are dropped — the tool row itself already identifies the
+ * action. `plan` rows and state-only notices are dropped too (both clients
+ * omit `Plan` from the transcript). A turn footer only survives as the final
+ * item, so old footers stop reading like transcript content.
+ */
+export function transcriptItems(
+  rows: TranscriptRow[],
+  pendingApprovalId: string | null,
+  turnActive: boolean,
+): TranscriptItem[] {
+  const groups = activityGroupsByTurn(rows, pendingApprovalId, turnActive);
+  const grouped = new Set<string>();
+  for (const group of groups.values()) for (const row of group.rows) grouped.add(row.id);
+
+  const items: TranscriptItem[] = [];
+  let turnId = "before-first-message";
+  const emitted = new Set<string>();
+  for (const row of rows) {
+    if (row.kind === "user") turnId = row.id;
+    const groupId = `turn:${turnId}`;
+    const group = groups.get(groupId);
+    if (group && grouped.has(row.id)) {
+      // The group renders once, at its first member's position.
+      if (!emitted.has(groupId)) {
+        emitted.add(groupId);
+        items.push({ type: "group", id: groupId, group });
+      }
+      continue;
+    }
+    if (row.kind === "plan") continue;
+    if (row.kind === "notice" && isStateOnlyNotice(row)) continue;
+    // A resolved approval outside a group adds nothing the tool row does not
+    // already say. A pending one always renders.
+    if (row.kind === "approval" && row.id !== pendingApprovalId) continue;
+    items.push({ type: "row", row });
+  }
+
+  return items.filter(
+    (item, index) =>
+      !(item.type === "row" && turnMeta(item.row) !== null) || index === items.length - 1,
+  );
+}
+
+// ---------------------------------------------------------------------------
+// composer: `/` command autocomplete off `available_commands_update` notices
+// ---------------------------------------------------------------------------
+
+export interface AvailableCommand {
+  name: string;
+  description: string;
+  input?: { hint?: string };
+}
+
+/** The live command list is whatever the most recent
+ *  `available_commands_update` notice carries (docs/STRUCTURED-VIEW.md). */
+export function commandsFromTranscript(rows: TranscriptRow[]): AvailableCommand[] {
+  for (let i = rows.length - 1; i >= 0; i--) {
+    if (rows[i].kind !== "notice") continue;
+    const data = rows[i].data as { sessionUpdate?: string; availableCommands?: unknown[] } | undefined;
+    if (data?.sessionUpdate !== "available_commands_update") continue;
+    return (data.availableCommands ?? []).flatMap((value) => {
+      if (!value || typeof value !== "object") return [];
+      const command = value as Partial<AvailableCommand>;
+      if (typeof command.name !== "string" || typeof command.description !== "string") return [];
+      return [{ name: command.name, description: command.description, input: command.input }];
+    });
+  }
+  return [];
+}
+
+export interface CommandToken {
+  start: number;
+  end: number;
+  query: string;
+}
+
+/** The whitespace-delimited token under the caret, when it is a `/command`
+ *  being typed. Completing one replaces only that token. */
+export function commandTokenAt(
+  value: string,
+  selectionStart: number,
+  selectionEnd: number,
+): CommandToken | null {
+  if (selectionStart !== selectionEnd) return null;
+  let start = selectionStart;
+  while (start > 0 && !/\s/.test(value[start - 1])) start--;
+  let end = selectionStart;
+  while (end < value.length && !/\s/.test(value[end])) end++;
+  const match = /^\/([^\s/]*)$/.exec(value.slice(start, selectionStart));
+  return match ? { start, end, query: match[1].toLocaleLowerCase() } : null;
+}
+
+/** Substring match, prefix matches first, then alphabetical. */
+export function filterCommands(commands: AvailableCommand[], query: string): AvailableCommand[] {
+  return commands
+    .filter((command) => command.name.toLocaleLowerCase().includes(query))
+    .sort((a, b) => {
+      const aStarts = a.name.toLocaleLowerCase().startsWith(query);
+      const bStarts = b.name.toLocaleLowerCase().startsWith(query);
+      return aStarts === bStarts ? a.name.localeCompare(b.name) : aStarts ? -1 : 1;
+    });
+}
+
+/** Replace the token under the caret with `/name`, returning the new draft and
+ *  where the caret lands. A trailing space is added only when the completion
+ *  ends the draft. */
+export function applyCommand(
+  value: string,
+  token: CommandToken,
+  name: string,
+): { value: string; cursor: number } {
+  const before = value.slice(0, token.start);
+  const after = value.slice(token.end);
+  let replacement = `/${name}`;
+  let cursor = before.length + replacement.length;
+  if (after.length === 0) {
+    replacement += " ";
+    cursor++;
+  } else if (/^[ \t]/.test(after)) {
+    cursor++;
+  }
+  return { value: before + replacement + after, cursor };
+}
+
+// ---------------------------------------------------------------------------
+// session config menu
+// ---------------------------------------------------------------------------
+
+/** Category order the config menu sorts by; anything else lands after. */
+const CONFIG_CATEGORY_ORDER = ["model", "thought_level", "mode", "model_config"];
+
+export function orderConfigOptions<T extends { category?: string | null }>(options: T[]): T[] {
+  return [...options].sort((a, b) => {
+    const rank = (category?: string | null) => CONFIG_CATEGORY_ORDER.indexOf(category ?? "");
+    const aRank = rank(a.category);
+    const bRank = rank(b.category);
+    return (aRank < 0 ? 99 : aRank) - (bRank < 0 ? 99 : bRank);
+  });
+}

web/src/components/structured/render.ts

@@ -0,0 +1,52 @@
+// Pure text helpers for the structured transcript, kept when
+// structuredRender.ts's imperative DOM builders were deleted (#253):
+// markdown rendering (sanitized) and the elapsed/context formatters.
+
+import { marked, Renderer } from "marked";
+
+import { escapeHtml } from "../../html.js";
+
+/** Small inline renderer retained for compact labels and focused tests. */
+export function renderInlineMarkdown(text: string): string {
+  const escaped = escapeHtml(text);
+  return escaped
+    .replace(/`([^`]+)`/g, "<code>$1</code>")
+    .replace(/\*\*([^*]+)\*\*/g, "<strong>$1</strong>")
+    .replace(/(?<!\*)\*([^*]+)\*(?!\*)/g, "<em>$1</em>");
+}
+
+/** Render assistant output as GFM, then sanitize the complete result before it
+ * enters the DOM. This gives transcripts proper tables, lists, code blocks and
+ * links without trusting model-authored HTML or URL attributes. */
+export function renderMarkdown(text: string): string {
+  const renderer = new Renderer();
+  renderer.html = ({ text: raw }) => escapeHtml(raw);
+  renderer.image = ({ text: alt }) => escapeHtml(alt ? `[image: ${alt}]` : "[image]");
+  renderer.link = ({ href, title, tokens }) => {
+    const label = renderer.parser.parseInline(tokens);
+    const scheme = /^([a-z][a-z\d+.-]*):/i.exec(href.trim())?.[1]?.toLowerCase();
+    if (scheme && !["http", "https", "mailto"].includes(scheme)) return label;
+    const safeTitle = title ? ` title="${escapeHtml(title)}"` : "";
+    return `<a href="${escapeHtml(href)}"${safeTitle}>${label}</a>`;
+  };
+
+  return marked.parse(text, { async: false, gfm: true, renderer });
+}
+
+function compactNumber(value: number): string {
+  if (Math.abs(value) < 1_000) return String(value);
+  if (Math.abs(value) < 1_000_000) return `${(value / 1_000).toFixed(value % 1_000 === 0 ? 0 : 1)}k`;
+  return `${(value / 1_000_000).toFixed(value % 1_000_000 === 0 ? 0 : 1)}m`;
+}
+
+export function formatElapsed(milliseconds: number): string {
+  const seconds = Math.max(0, Math.floor(milliseconds / 1_000));
+  if (seconds < 60) return `${seconds}s`;
+  const minutes = Math.floor(seconds / 60);
+  const remainder = seconds % 60;
+  return remainder === 0 ? `${minutes}m` : `${minutes}m ${remainder}s`;
+}
+
+export function formatContextTokens(value: number): string {
+  return `${compactNumber(value)} context`;
+}

web/src/components/structured/toolPayload.ts

@@ -0,0 +1,112 @@
+// What a tool row shows below its head, derived from `rawInput`/`rawOutput`.
+// The adapters emit a handful of recognisable payload shapes (a shell command,
+// an MCP call, a search, a plain function call); anything else falls through to
+// the raw JSON disclosure rather than being guessed at.
+
+import type { AcpContentBlock, AcpToolCallContent, AcpToolCallLike } from "../../types.js";
+
+/** One labelled `<pre>` block under a tool head. */
+export interface ToolDetail {
+  label: string;
+  text: string;
+}
+
+export interface ToolPayload {
+  details: ToolDetail[];
+  /** A shell command's exit code, when the output carried one. */
+  exitCode: number | null;
+  raw: { input: string | null; output: string | null };
+}
+
+function printable(value: unknown): string | null {
+  if (value === undefined || value === null) return null;
+  if (typeof value === "string") return value;
+  try {
+    return JSON.stringify(value, null, 2);
+  } catch {
+    return String(value);
+  }
+}
+
+function jsonPrintable(value: unknown): string | null {
+  if (value === undefined) return null;
+  try {
+    return JSON.stringify(value, null, 2) ?? null;
+  } catch {
+    return printable(value);
+  }
+}
+
+function record(value: unknown): Record<string, unknown> | null {
+  if (!value || typeof value !== "object" || Array.isArray(value)) return null;
+  return value as Record<string, unknown>;
+}
+
+/** Push a detail unless it is empty, or repeats text the content blocks above
+ *  already show verbatim. */
+function push(details: ToolDetail[], label: string, value: unknown, duplicates?: Set<string>): void {
+  const text = printable(value);
+  if (text !== null && text !== "" && !duplicates?.has(text)) details.push({ label, text });
+}
+
+/** The text of every `content` block, so a `rawOutput` echoing it is not shown
+ *  a second time. */
+function contentTexts(content: AcpToolCallContent[]): Set<string> {
+  return new Set(
+    content
+      .filter((block): block is Extract<AcpToolCallContent, { type: "content" }> => block.type === "content")
+      .filter((block) => block.content.type === "text")
+      .map((block) => (block.content as Extract<AcpContentBlock, { type: "text" }>).text),
+  );
+}
+
+export function toolPayload(tool: AcpToolCallLike, content: AcpToolCallContent[]): ToolPayload {
+  const details: ToolDetail[] = [];
+  let exitCode: number | null = null;
+  const input = record(tool.rawInput);
+  const texts = contentTexts(content);
+
+  if (input) {
+    if (typeof input.command === "string") {
+      details.push({ label: "Command", text: input.command });
+      push(details, "Working directory", input.cwd);
+      const result = record(tool.rawOutput);
+      if (result) {
+        push(details, "Output", result.formatted_output ?? result.stdout ?? result.output, texts);
+        if (typeof result.exit_code === "number") exitCode = result.exit_code;
+      }
+    } else if (typeof input.server === "string" && typeof input.tool === "string" && "arguments" in input) {
+      push(details, "Arguments", input.arguments);
+      const result = record(tool.rawOutput);
+      if (result) {
+        push(details, "Result", result.result, texts);
+        push(details, "Error", result.error);
+      }
+    } else if (typeof input.query === "string" && (tool.kind === "search" || input.type === "webSearch")) {
+      details.push({ label: "Query", text: input.query });
+      push(details, "Action", input.action);
+    } else if ("arguments" in input) {
+      push(details, "Arguments", input.arguments);
+      const result = record(tool.rawOutput);
+      if (result) push(details, "Result", result.output, texts);
+    }
+  }
+
+  return {
+    details,
+    exitCode,
+    raw: { input: jsonPrintable(tool.rawInput), output: jsonPrintable(tool.rawOutput) },
+  };
+}
+
+/** A `data:` URL for an inline image/audio block, or `null` when the mime type
+ *  is absent or does not name that family — never a URL built from an
+ *  unvalidated string. */
+export function safeMediaSource(
+  mimeType: string | undefined,
+  data: string | undefined,
+  family: "image" | "audio",
+): string | null {
+  if (!mimeType || !data || !new RegExp(`^${family}/[a-z0-9.+-]+$`, "i").test(mimeType)) return null;
+  return `data:${mimeType};base64,${data}`;
+}

web/src/components/structured/useStructuredSession.ts

@@ -0,0 +1,216 @@
+// The `WS /api/structured/:id` half of the pane (#246). Every connect — fresh
+// or reconnect — resends the whole transcript rather than resuming a cursor
+// (docs/STRUCTURED-VIEW.md), so a snapshot replaces state wholesale instead of
+// merging into what came before.
+
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+
+import { structuredWsUrl } from "../../routes.js";
+import { INITIAL_RECONNECT_MS, MAX_RECONNECT_MS } from "../../reconnect.js";
+import type {
+  ReducedState,
+  StructuredEvent,
+  TranscriptDelta,
+  TranscriptRow,
+  Uuid,
+} from "../../types.js";
+
+export type StructuredStatus = "connecting" | "open" | "reconnecting" | "closed" | "error";
+
+/** Injectable so tests can drive the socket without a daemon — the same seam
+ *  structured.ts used. */
+export type StructuredSocketFactory = (sessionId: Uuid) => WebSocket;
+
+const idleState = (): ReducedState => ({
+  turn: { responding: false, thinking: false, active_tool_calls: [] },
+});
+
+function applyDelta(rows: TranscriptRow[], delta: TranscriptDelta): TranscriptRow[] {
+  if (delta.type === "append") {
+    // A patch can arrive for a row this connection has never seen (its
+    // snapshot predates it); treating an unknown id as an append keeps the
+    // transcript complete rather than dropping the row.
+    const at = rows.findIndex((row) => row.id === delta.row.id);
+    return at === -1 ? [...rows, delta.row] : rows.map((row, i) => (i === at ? delta.row : row));
+  }
+  if (delta.type === "patch") {
+    const at = rows.findIndex((row) => row.id === delta.row.id);
+    return at === -1 ? [...rows, delta.row] : rows.map((row, i) => (i === at ? delta.row : row));
+  }
+  return rows.filter((row) => row.id !== delta.id);
+}
+
+export interface StructuredSession {
+  rows: TranscriptRow[];
+  state: ReducedState;
+  status: StructuredStatus;
+  /** A daemon-supplied close reason (code ≥ 4000), when there is one. */
+  detail: string | null;
+  /** The number of sockets this pane has opened, newest last. A submission
+   *  that straddles a reconnect uses it to notice its acceptance may predate
+   *  the current snapshot. */
+  socketGeneration: number;
+  /** Drop the socket and reconnect, so the next snapshot cannot predate a
+   *  POST that has already been accepted. */
+  reconnect(): void;
+}
+
+export interface UseStructuredSessionOptions {
+  shouldReconnect?: (code: number) => boolean;
+  onClosed?: () => void;
+  socketFactory?: StructuredSocketFactory;
+}
+
+/** Application-defined close codes (daemon rejection) and the clean-close code
+ *  — retrying either would only loop. */
+function defaultShouldReconnect(code: number): boolean {
+  return code < 4000 && code !== 1000;
+}
+
+export function useStructuredSession(
+  sessionId: Uuid,
+  {
+    shouldReconnect = defaultShouldReconnect,
+    onClosed,
+    socketFactory = (id) => new WebSocket(structuredWsUrl(id)),
+  }: UseStructuredSessionOptions = {},
+): StructuredSession {
+  const [rows, setRows] = useState<TranscriptRow[]>([]);
+  const [state, setState] = useState<ReducedState>(idleState);
+  const [status, setStatus] = useState<StructuredStatus>("connecting");
+  const [detail, setDetail] = useState<string | null>(null);
+  const [socketGeneration, setSocketGeneration] = useState(0);
+
+  // Read through refs so a changed callback never tears the socket down.
+  const shouldReconnectRef = useRef(shouldReconnect);
+  const onClosedRef = useRef(onClosed);
+  const factoryRef = useRef(socketFactory);
+  shouldReconnectRef.current = shouldReconnect;
+  onClosedRef.current = onClosed;
+  factoryRef.current = socketFactory;
+
+  const reconnectRef = useRef<() => void>(() => {});
+
+  useEffect(() => {
+    let disposed = false;
+    let socket: WebSocket | null = null;
+    let reconnectMs = INITIAL_RECONNECT_MS;
+    let timer: number | null = null;
+
+    const closeSocket = () => {
+      const existing = socket;
+      socket = null;
+      if (!existing) return;
+      existing.onopen = null;
+      existing.onmessage = null;
+      existing.onerror = null;
+      existing.onclose = null;
+      try {
+        existing.close();
+      } catch {
+        // ignore — an already-closing socket has nothing to close
+      }
+    };
+
+    const cancelTimer = () => {
+      if (timer === null) return;
+      window.clearTimeout(timer);
+      timer = null;
+    };
+
+    function connect(): void {
+      if (disposed) return;
+      cancelTimer();
+      closeSocket();
+      const current = factoryRef.current(sessionId);
+      socket = current;
+      setSocketGeneration((n) => n + 1);
+
+      current.onopen = () => {
+        if (disposed || socket !== current) return;
+        reconnectMs = INITIAL_RECONNECT_MS;
+        setDetail(null);
+        setStatus("open");
+      };
+
+      current.onmessage = (ev) => {
+        if (disposed || socket !== current) return;
+        if (typeof ev.data !== "string") return;
+        let msg: StructuredEvent;
+        try {
+          msg = JSON.parse(ev.data) as StructuredEvent;
+        } catch {
+          return; // not a structured event we understand
+        }
+        switch (msg.type) {
+          case "transcript_snapshot":
+            setRows([...msg.snapshot.rows]);
+            break;
+          case "reduced_state":
+            setState(msg.state);
+            break;
+          case "projection_update":
+            if (msg.transcript) {
+              const delta = msg.transcript;
+              setRows((previous) => applyDelta(previous, delta));
+            }
+            setState(msg.state);
+            break;
+        }
+      };
+
+      current.onerror = () => {
+        if (disposed || socket !== current) return;
+        setStatus("error");
+      };
+
+      current.onclose = (ev) => {
+        if (disposed || socket !== current) return;
+        socket = null;
+        const reason = ev.reason?.trim();
+        if (ev.code >= 4000 && reason) {
+          setDetail(reason);
+          setStatus("error");
+          return;
+        }
+        if (shouldReconnectRef.current(ev.code)) {
+          const delay = Math.min(reconnectMs, MAX_RECONNECT_MS);
+          setStatus("reconnecting");
+          timer = window.setTimeout(() => {
+            timer = null;
+            if (disposed) return;
+            reconnectMs = Math.min(reconnectMs * 2, MAX_RECONNECT_MS);
+            connect();
+          }, delay);
+          return;
+        }
+        setDetail(String(ev.code));
+        setStatus("closed");
+        onClosedRef.current?.();
+      };
+    }
+
+    reconnectRef.current = () => {
+      if (disposed) return;
+      setStatus("reconnecting");
+      connect();
+    };
+
+    setStatus("connecting");
+    connect();
+
+    return () => {
+      disposed = true;
+      reconnectRef.current = () => {};
+      cancelTimer();
+      closeSocket();
+    };
+  }, [sessionId]);
+
+  const reconnect = useCallback(() => reconnectRef.current(), []);
+
+  return useMemo(
+    () => ({ rows, state, status, detail, socketGeneration, reconnect }),
+    [rows, state, status, detail, socketGeneration, reconnect],
+  );
+}

web/src/components/terminal/KeyBar.tsx

@@ -92,7 +92,7 @@ export function KeyBar({ armed, onToggleMod, onClearMods, onSend }: KeyBarProps)
     <div
       role="toolbar"
       aria-label="Special keys"
-      className="flex flex-wrap gap-1 border-t border-white/10 bg-black/20 p-1"
+      className="keybar-touch flex-wrap gap-1 border-t border-white/10 bg-black/20 p-1"
     >
       {KEY_DEFS.map((def) => {
         if ("mod" in def) {

web/src/components/terminal/TerminalPane.tsx

@@ -347,7 +347,11 @@ export const TerminalPane = forwardRef<TerminalPaneHandle, TerminalPaneProps>(
 
     return (
       <div className={className ? `flex h-full flex-col ${className}` : "flex h-full flex-col"}>
-        <div ref={bodyRef} className="min-h-0 flex-1" />
+        {/* `attach-body` is what styles.css keys the terminal's own sizing on
+            (`.attach-body .xterm { width/height: 100% }`) plus the hidden
+            scrollbar and touch-scroll rules. Without it the terminal measures
+            its own stale viewport and never grows back to the pane. */}
+        <div ref={bodyRef} className="attach-body min-h-0 flex-1" />
         {keybarActive && (
           <KeyBar
             armed={keyBar.armed}

web/src/connections.test.ts

@@ -1,383 +0,0 @@
-// @vitest-environment happy-dom
-import { afterEach, describe, expect, it, vi } from "vitest";
-
-import { ConnectionPool } from "./connections.js";
-import { CatalogStore } from "./events.js";
-import type { Session } from "./types.js";
-
-// The pane's own bytes-out path, stubbed: the escape hatch only needs to know
-// the pool reaches the focused connection with them.
-const sent: { id: string; data: string }[] = [];
-const disposed: string[] = [];
-const mounts: { id: string; focus: boolean | undefined }[] = [];
-function fakeConn(kind: string, id: string) {
-  const el = document.createElement("div");
-  el.tabIndex = -1; // focusable via .focus(), like a real input/terminal
-  el.dataset.kind = kind;
-  el.dataset.session = id;
-  return {
-    sessionId: id,
-    kind,
-    el,
-    onMount(opts?: { focus?: boolean }) {
-      mounts.push({ id, focus: opts?.focus });
-    },
-    onUnmount() {},
-    focusTerminal() {},
-    sendInput(data: string) {
-      sent.push({ id, data });
-    },
-    updateInfo() {},
-    dispose() {
-      disposed.push(`${kind}:${id}`);
-    },
-  };
-}
-vi.mock("./attach.js", () => ({
-  createAttachConnection: (id: string) => fakeConn("attach", id),
-}));
-vi.mock("./structured.js", () => ({
-  createStructuredConnection: (id: string) => fakeConn("structured", id),
-}));
-
-afterEach(() => {
-  vi.unstubAllGlobals();
-  sent.length = 0;
-  disposed.length = 0;
-  mounts.length = 0;
-});
-
-/** Minimal fixture for the `CatalogState` a `CatalogStore` broadcasts. */
-function session(id: string, view?: "Terminal" | "Structured"): Session {
-  return {
-    id,
-    cwd: "/repo",
-    command: "claude",
-    env: {},
-    metadata: {},
-    status: "Running",
-    created_at: "2026-01-01T00:00:00Z",
-    view,
-  };
-}
-
-/** A `CatalogStore` an id can be pushed into on demand, mirroring
- *  events.test.ts's own injectable-socket pattern. */
-class FakeCatalogSocket {
-  onmessage: ((ev: { data: string }) => void) | null = null;
-  onopen: (() => void) | null = null;
-  onclose: (() => void) | null = null;
-  onerror: (() => void) | null = null;
-  close(): void {}
-  push(sessions: Session[]): void {
-    this.onmessage?.({ data: JSON.stringify({ type: "Snapshot", sessions }) });
-  }
-}
-function fakeStore(): { store: CatalogStore; socket: FakeCatalogSocket } {
-  const socket = new FakeCatalogSocket();
-  const store = new CatalogStore({ socket: () => socket as unknown as WebSocket });
-  store.start();
-  return { store, socket };
-}
-
-const A = "aaaaaaaa-0000-0000-0000-0000000000ff";
-const B = "bbbbbbbb-0000-0000-0000-0000000000ff";
-
-function mockFetch() {
-  const fetchMock = vi.fn(() => Promise.resolve(new Response(null, { status: 204 })));
-  vi.stubGlobal("fetch", fetchMock);
-  return fetchMock;
-}
-
-describe("ConnectionPool.setFocus", () => {
-  it("reports the new session focused, none unfocused, the first time", () => {
-    const fetchMock = mockFetch();
-    const pool = new ConnectionPool();
-
-    pool.setFocus(A);
-
-    expect(fetchMock).toHaveBeenCalledOnce();
-    const [url, init] = fetchMock.mock.calls[0] as unknown as [string, RequestInit];
-    expect(url).toBe(`/api/sessions/${A}/focus`);
-    expect(init.method).toBe("POST");
-    expect(JSON.parse(init.body as string)).toEqual({ focused: true });
-  });
-
-  it("unfocuses the previous session and focuses the new one on a switch", () => {
-    const fetchMock = mockFetch();
-    const pool = new ConnectionPool();
-    pool.setFocus(A);
-    fetchMock.mockClear();
-
-    pool.setFocus(B);
-
-    expect(fetchMock).toHaveBeenCalledTimes(2);
-    const bodies = fetchMock.mock.calls.map(([url, init]: unknown[]) => [
-      url,
-      JSON.parse((init as RequestInit).body as string),
-    ]);
-    expect(bodies).toContainEqual([`/api/sessions/${A}/focus`, { focused: false }]);
-    expect(bodies).toContainEqual([`/api/sessions/${B}/focus`, { focused: true }]);
-  });
-
-  it("reports unfocused when focus clears to null", () => {
-    const fetchMock = mockFetch();
-    const pool = new ConnectionPool();
-    pool.setFocus(A);
-    fetchMock.mockClear();
-
-    pool.setFocus(null);
-
-    expect(fetchMock).toHaveBeenCalledOnce();
-    const [url, init] = fetchMock.mock.calls[0] as unknown as [string, RequestInit];
-    expect(url).toBe(`/api/sessions/${A}/focus`);
-    expect(JSON.parse(init.body as string)).toEqual({ focused: false });
-  });
-
-  it("is a no-op when the focused session doesn't change", () => {
-    const fetchMock = mockFetch();
-    const pool = new ConnectionPool();
-    pool.setFocus(A);
-    fetchMock.mockClear();
-
-    pool.setFocus(A);
-
-    expect(fetchMock).not.toHaveBeenCalled();
-  });
-
-  it("does not let a fetch rejection break the pool", async () => {
-    vi.stubGlobal(
-      "fetch",
-      vi.fn(() => Promise.reject(new Error("offline"))),
-    );
-    const pool = new ConnectionPool();
-
-    expect(() => pool.setFocus(A)).not.toThrow();
-    // Let the rejected promise's `.catch` settle before the test ends.
-    await Promise.resolve();
-    await Promise.resolve();
-  });
-});
-
-describe("ConnectionPool.sendToFocused", () => {
-  it("types the bytes into the focused session's PTY", () => {
-    mockFetch();
-    sent.length = 0;
-    const pool = new ConnectionPool();
-    const pane = document.createElement("div");
-    pool.mount(A, pane);
-    pool.setFocus(A);
-
-    expect(pool.sendToFocused("\x0b")).toBe(true);
-    expect(sent).toEqual([{ id: A, data: "\x0b" }]);
-  });
-
-  it("is a no-op with nothing focused", () => {
-    mockFetch();
-    sent.length = 0;
-    const pool = new ConnectionPool();
-
-    expect(pool.sendToFocused("\x0b")).toBe(false);
-    expect(sent).toEqual([]);
-  });
-});
-
-// A deep link or restored layout can `mount()` a session before the catalog
-// snapshot names its view — the daemon defaults an absent `view` to
-// `"Terminal"`, but so does an *unknown* session, and only one of those is
-// actually resolved (#140 review).
-describe("ConnectionPool: view resolution races", () => {
-  it("replaces a wrongly-typed connection once the catalog resolves it, without waiting for another mount()", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-
-    pool.mount(A, pane); // no info: deep-link-before-snapshot race
-    expect(disposed).toEqual([]);
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    // The fresh connection landed in the same pane nothing re-mounted it into.
-    expect(pane.children).toHaveLength(1);
-  });
-
-  it("also repairs a wrongly-typed connection that is parked, not mounted, without evicting its other parked siblings", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const hidden = document.body.lastElementChild as HTMLElement; // this pool's own cache
-    pool.mount(A, document.createElement("div"));
-    pool.mount(B, document.createElement("div"));
-    pool.unmount(A);
-    pool.unmount(B);
-    disposed.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    // B's own element is still parked — A's repair didn't wipe its siblings
-    // out of the shared hidden cache.
-    expect(hidden.querySelector(`[data-session="${B}"]`)).not.toBeNull();
-    expect((hidden.querySelector(`[data-session="${A}"]`) as HTMLElement | null)?.dataset.kind).toBe("structured");
-  });
-
-  it("does not replace a connection whose resolved view already matches", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    pool.mount(A, pane, { name: "a", command: "claude", view: "Structured" });
-    disposed.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual([]);
-  });
-
-  it("does not downgrade an already-resolved connection when a later mount() call has no info", () => {
-    mockFetch();
-    const pool = new ConnectionPool();
-    const pane = document.createElement("div");
-    pool.mount(A, pane, { name: "a", command: "claude", view: "Structured" });
-    disposed.length = 0;
-
-    pool.mount(A, pane); // e.g. a re-render before the catalog answers again
-
-    expect(disposed).toEqual([]);
-  });
-
-  it("does not treat a session missing from the catalog as Terminal and churn a live connection", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    pool.mount(A, pane, { name: "a", command: "claude", view: "Structured" });
-    disposed.length = 0;
-
-    // `A` is absent from this snapshot — main.ts's own subscription handles
-    // closing the pane; the pool must not race it by "fixing" the view first.
-    socket.push([session(B, "Terminal")]);
-
-    expect(disposed).toEqual([]);
-  });
-
-  it("re-focuses the fresh connection when the keyboard was actually inside the replaced pane", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    document.body.appendChild(pane);
-    pool.mount(A, pane);
-    pool.setFocus(A);
-    (pane.firstElementChild as HTMLElement).focus();
-    expect(document.activeElement).toBe(pane.firstElementChild);
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    expect(mounts).toEqual([{ id: A, focus: true }]);
-    pane.remove();
-  });
-
-  it("does not steal focus from a same-tab sidebar preview even though focusedId still names the previous pane", () => {
-    // docs/PREVIEW.md: previewing a session already open in the current tab
-    // moves the keyboard into the sidebar without ever calling setFocus, so
-    // `focusedId` keeps naming the pane the operator was in before — but the
-    // DOM disagrees, and the DOM is what must decide.
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    document.body.appendChild(pane);
-    pool.mount(A, pane);
-    pool.setFocus(A);
-    (pane.firstElementChild as HTMLElement).focus();
-
-    const sidebarInput = document.createElement("input");
-    document.body.appendChild(sidebarInput);
-    sidebarInput.focus();
-    expect(document.activeElement).toBe(sidebarInput);
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    expect(mounts).toEqual([{ id: A, focus: false }]);
-    pane.remove();
-    sidebarInput.remove();
-  });
-
-  it("counts focus on a descendant of the pane's element, not just the element itself", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    document.body.appendChild(pane);
-    pool.mount(A, pane);
-    pool.setFocus(A);
-    const textarea = document.createElement("textarea");
-    (pane.firstElementChild as HTMLElement).appendChild(textarea);
-    textarea.focus();
-    expect(document.activeElement).toBe(textarea);
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(mounts).toEqual([{ id: A, focus: true }]);
-    pane.remove();
-  });
-
-  it("treats document.body (nothing meaningfully focused) as no active descendant", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    document.body.appendChild(pane);
-    pool.mount(A, pane);
-    pool.setFocus(A);
-    (document.activeElement as HTMLElement | null)?.blur();
-    expect(document.activeElement).toBe(document.body);
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(mounts).toEqual([{ id: A, focus: false }]);
-    pane.remove();
-  });
-
-  it("does not steal focus for a merely-visible pane that was never actually focused", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const paneA = document.createElement("div");
-    const paneB = document.createElement("div");
-    pool.mount(A, paneA);
-    pool.mount(B, paneB);
-    pool.setFocus(B); // B is the real keyboard focus; A is only visible
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    expect(mounts).toEqual([{ id: A, focus: false }]);
-  });
-
-  it("does not focus a parked (unmounted) connection it repairs", () => {
-    mockFetch();
-    const { store, socket } = fakeStore();
-    const pool = new ConnectionPool({ store });
-    const pane = document.createElement("div");
-    pool.mount(A, pane);
-    pool.setFocus(A);
-    pool.unmount(A); // parked — no longer visible, `focusedId` still names it
-    mounts.length = 0;
-
-    socket.push([session(A, "Structured")]);
-
-    expect(disposed).toEqual(["attach:" + A]);
-    expect(mounts).toEqual([]); // parked repair calls onUnmount, never onMount
-  });
-});

web/src/connections.ts

@@ -1,298 +0,0 @@
-import { createAttachConnection } from "./attach.js";
-import type { AttachInfo } from "./paneTitle.js";
-import type { PaneConnection } from "./pane.js";
-import { createStructuredConnection } from "./structured.js";
-import { setSessionFocus } from "./api.js";
-import type { CatalogState, CatalogStore } from "./events.js";
-import { sessionName, type SessionView, type Uuid } from "./types.js";
-
-/**
- * How many *parked* (off-screen but still-connected) sessions to keep warm
- * beyond whatever is currently visible. Visible panes are never counted or
- * evicted — only this background buffer is bounded, so the browser doesn't hold
- * an unbounded fan of open sockets. Switching back to a recently-viewed session
- * is instant while it's still parked; older ones are evicted (WS closed) once
- * the buffer overflows.
- */
-const MAX_PARKED = 6;
-
-/** A session's view defaults to `"Terminal"` wherever it isn't carried —
- *  matching the wire default (`SessionView`'s `#[default]`, types.ts). Only
- *  meaningful once the session itself is known; an altogether-unknown
- *  session (no `AttachInfo`/`Session` at all) is a distinct, un-resolved
- *  state callers must check for separately, not "Terminal". */
-function resolveView(view: SessionView | undefined): SessionView {
-  return view ?? "Terminal";
-}
-
-export interface PoolOptions {
-  /** Fired when the focused session changes (drives sidebar highlight + HUD). */
-  onFocusChange?: (id: Uuid | null) => void;
-  /** Fired when a view's explicit disconnect control is used; the embedder
-   *  decides how to update the layout/route (then typically calls `close`). */
-  onRequestClose?: (id: Uuid) => void;
-  /** Fired when a connection's socket closes on its own (session ended/dropped),
-   *  not via an intentional close/eviction. The embedder closes the pane. */
-  onClosed?: (id: Uuid) => void;
-  /** Forwarded to each connection: should a dropped socket be retried? */
-  shouldReconnect?: (id: Uuid, code: number) => boolean;
-  /** Threaded through to a structured connection so its rail can read live
-   *  worktree/git-status data (#140). Terminal connections don't need it. */
-  store?: CatalogStore;
-}
-
-/**
- * Owns the set of live attach connections, decoupled from the router/UI.
- *
- * Unlike the old single-active pool, several connections can be **mounted**
- * (visible) at once — one per leaf of the active tab's layout tree. The shell
- * reconciles the visible set with {@link setVisible}; sessions no longer shown
- * are **parked** in a hidden cache (still streaming) and bounded by an LRU. A
- * connection only dies on eviction, an explicit {@link close}, or {@link dispose}.
- */
-export class ConnectionPool {
-  /** All live connections. Insertion order doubles as LRU: oldest first. */
-  private readonly cache = new Map<Uuid, PaneConnection>();
-  /** The view each cached connection was actually created for — a deep link
-   *  or a restored layout can `mount()` a session before the catalog
-   *  snapshot names its view, defaulting it to `"Terminal"`; this is what
-   *  lets a later reconciliation notice the resolved view disagrees (#140
-   *  review). */
-  private readonly connViews = new Map<Uuid, SessionView>();
-  /** Sessions currently mounted into a visible pane (never evicted). */
-  private readonly mounted = new Set<Uuid>();
-  private readonly hidden: HTMLElement;
-  private focusedId: Uuid | null = null;
-  private readonly opts: PoolOptions;
-  private readonly unsubscribeStore?: () => void;
-
-  constructor(opts: PoolOptions = {}) {
-    this.opts = opts;
-    // Off-screen home for parked, still-connected terminals.
-    this.hidden = document.createElement("div");
-    this.hidden.className = "conn-cache";
-    this.hidden.setAttribute("aria-hidden", "true");
-    document.body.appendChild(this.hidden);
-    // A session `mount()`ed before its catalog entry exists gets a
-    // `"Terminal"` connection by default; once the snapshot actually names
-    // the view, fix any connection that guessed wrong — nothing else
-    // re-`mount()`s an already-open pane just because the catalog updated.
-    this.unsubscribeStore = opts.store?.subscribe((state) => this.reconcileViews(state));
-  }
-
-  /** The focused session, or null when nothing is focused (welcome pane). */
-  focused(): Uuid | null {
-    return this.focusedId;
-  }
-
-  /** Back-compat alias for {@link focused} (used by the debug HUD). */
-  active(): Uuid | null {
-    return this.focusedId;
-  }
-
-  isMounted(id: Uuid): boolean {
-    return this.mounted.has(id);
-  }
-
-  /**
-   * Ensure `id` is live and shown inside `pane`, reusing its connection if one
-   * exists (refreshing LRU recency). Does not touch other mounted panes.
-   */
-  mount(id: Uuid, pane: HTMLElement, info?: AttachInfo, opts?: { focus?: boolean }): void {
-    let conn = this.cache.get(id);
-    if (conn) {
-      // `info === undefined` means "session not known yet", not "Terminal" —
-      // never downgrade a resolved connection just because a later caller
-      // couldn't resolve the session. Only a *resolved* view that disagrees
-      // with what this connection was built for forces a replace.
-      if (info !== undefined && resolveView(info.view) !== this.connViews.get(id)) {
-        conn = this.replace(id, info);
-      } else {
-        this.cache.delete(id);
-        this.cache.set(id, conn); // LRU refresh
-        if (info) conn.updateInfo(info);
-      }
-    } else {
-      conn = this.create(id, info);
-      this.cache.set(id, conn);
-    }
-    if (conn.el.parentElement !== pane) {
-      pane.replaceChildren(conn.el);
-      conn.onMount(opts);
-    } else if (!this.mounted.has(id)) {
-      conn.onMount(opts);
-    }
-    this.mounted.add(id);
-    this.evict();
-  }
-
-  private create(id: Uuid, info?: AttachInfo): PaneConnection {
-    const view = resolveView(info?.view);
-    this.connViews.set(id, view);
-    const connOpts = {
-      onRequestClose: (sid: Uuid) => this.opts.onRequestClose?.(sid),
-      onClosed: (sid: Uuid) => this.opts.onClosed?.(sid),
-      shouldReconnect: (sid: Uuid, code: number) => this.opts.shouldReconnect?.(sid, code) ?? false,
-    };
-    return view === "Structured"
-      ? createStructuredConnection(id, connOpts, info, this.opts.store)
-      : createAttachConnection(id, connOpts, info);
-  }
-
-  /** Dispose whatever is cached for `id` and cache a freshly created
-   *  connection in its place. Does not touch the DOM or `mounted` — callers
-   *  place the new element themselves. */
-  private replace(id: Uuid, info?: AttachInfo): PaneConnection {
-    this.cache.get(id)?.dispose();
-    const fresh = this.create(id, info);
-    this.cache.set(id, fresh);
-    return fresh;
-  }
-
-  /** Proactively fix any cached connection whose view no longer matches the
-   *  catalog — the only path that repairs a pane nothing will `mount()`
-   *  again on its own (parked, or mounted but not currently being
-   *  re-rendered by anything else). A session absent from `state` (not yet
-   *  known, or removed) is left alone — that's `main.ts`'s
-   *  `closePane`/eviction concern, not a view mismatch. */
-  private reconcileViews(state: CatalogState): void {
-    for (const id of [...this.cache.keys()]) {
-      const session = state.sessions.get(id);
-      if (session === undefined || resolveView(session.view) === this.connViews.get(id)) continue;
-      const existing = this.cache.get(id)!;
-      const parent = existing.el.parentElement;
-      const wasMounted = this.mounted.has(id);
-      // Capture before anything below touches the DOM: dispose()/el.remove()
-      // detach `existing.el`, and once a focused descendant is detached the
-      // browser moves `document.activeElement` to `<body>` — too late to
-      // tell whether the keyboard was actually in this pane.
-      const hadDomFocus = existing.el.contains(document.activeElement);
-      const info: AttachInfo = { name: sessionName(session), command: session.command, view: session.view };
-      const fresh = this.replace(id, info);
-      existing.el.remove(); // don't rely on dispose() to clear the DOM
-      if (parent && parent !== this.hidden) {
-        parent.replaceChildren(fresh.el);
-      } else {
-        // Parked: `this.hidden` holds every parked connection's element as
-        // siblings — append, never replaceChildren, or they'd all vanish.
-        this.hidden.appendChild(fresh.el);
-      }
-      if (wasMounted) {
-        // `focusedId` names the session the pool was last told to focus —
-        // but a same-tab sidebar preview moves the keyboard into the
-        // sidebar without clearing it (multiview.ts skips `setFocus` while
-        // previewing), so `focusedId` alone can point at a pane the
-        // keyboard already left. Only re-focus when the DOM agrees it
-        // never did.
-        fresh.onMount({ focus: this.focusedId === id && hadDomFocus });
-      } else {
-        fresh.onUnmount();
-      }
-    }
-  }
-
-  /** Park `id` back into the hidden cache (still connected) and stop showing it. */
-  unmount(id: Uuid): void {
-    if (!this.mounted.delete(id)) return;
-    const conn = this.cache.get(id);
-    if (conn) {
-      this.hidden.appendChild(conn.el); // stays alive, just off-screen
-      conn.onUnmount();
-    }
-  }
-
-  /**
-   * Reconcile the visible set to exactly `entries` (in render order): park any
-   * mounted session not listed, mount/refresh each listed one in its pane.
-   * `focus: false` shows the panes without taking the keyboard (preview).
-   */
-  setVisible(
-    entries: { id: Uuid; pane: HTMLElement; info?: AttachInfo }[],
-    opts?: { focus?: boolean },
-  ): void {
-    const next = new Set(entries.map((e) => e.id));
-    for (const id of [...this.mounted]) {
-      if (!next.has(id)) this.unmount(id);
-    }
-    for (const e of entries) this.mount(e.id, e.pane, e.info, opts);
-  }
-
-  /** Also tells the daemon which pane is focused (docs/SIDEBAR.md's
-   *  `AwaitingInput` auto-clear) — the sidebar highlight never calls this,
-   *  only a pane actually becoming the visible view. Best-effort: a failed
-   *  report only delays the glow clearing. */
-  setFocus(id: Uuid | null): void {
-    if (id === this.focusedId) return;
-    const previous = this.focusedId;
-    this.focusedId = id;
-    if (previous !== null) void setSessionFocus(previous, false).catch(() => {});
-    if (id !== null) void setSessionFocus(id, true).catch(() => {});
-    this.opts.onFocusChange?.(id);
-  }
-
-  /** Compat shim: show `id` alone in `pane` and focus it; park everything else. */
-  activate(id: Uuid, pane: HTMLElement, info?: AttachInfo): void {
-    this.setVisible([{ id, pane, info }]);
-    this.setFocus(id);
-  }
-
-  /** Compat shim: park all visible panes and clear focus (e.g. welcome pane). */
-  parkActive(): void {
-    for (const id of [...this.mounted]) this.unmount(id);
-    this.setFocus(null);
-  }
-
-  /** Put the keyboard back into the focused session's terminal. No-op when
-   *  nothing is focused (welcome pane) or its connection is gone. */
-  focusTerminal(): void {
-    if (this.focusedId === null) return;
-    this.cache.get(this.focusedId)?.focusTerminal();
-  }
-
-  /** Type raw bytes into the focused session's PTY. Returns false when there is
-   *  nothing focused, or its connection is gone — the leader's literal Ctrl-K
-   *  is a no-op over the welcome pane rather than an error
-   *  (docs/COMMAND-BAR.md). */
-  sendToFocused(data: string): boolean {
-    if (this.focusedId === null) return false;
-    const conn = this.cache.get(this.focusedId);
-    if (!conn) return false;
-    conn.sendInput(data);
-    return true;
-  }
-
-  /** Fully disconnect + forget a session. */
-  close(id: Uuid): void {
-    const conn = this.cache.get(id);
-    if (!conn) return;
-    conn.dispose();
-    this.cache.delete(id);
-    this.connViews.delete(id);
-    this.mounted.delete(id);
-    if (this.focusedId === id) this.setFocus(null);
-  }
-
-  dispose(): void {
-    this.unsubscribeStore?.();
-    for (const conn of this.cache.values()) conn.dispose();
-    this.cache.clear();
-    this.connViews.clear();
-    this.mounted.clear();
-    this.hidden.remove();
-  }
-
-  /** Drop least-recently-viewed *parked* connections beyond the buffer cap. */
-  private evict(): void {
-    while (this.cache.size - this.mounted.size > MAX_PARKED) {
-      let victim: Uuid | null = null;
-      for (const id of this.cache.keys()) {
-        if (!this.mounted.has(id)) {
-          victim = id;
-          break;
-        }
-      }
-      if (victim === null) break;
-      this.close(victim);
-    }
-  }
-}

web/src/contextMenu.test.ts

@@ -1,58 +0,0 @@
-// @vitest-environment happy-dom
-import { afterEach, describe, expect, it, vi } from "vitest";
-
-import { closeContextMenu, openContextMenu } from "./contextMenu.js";
-
-afterEach(() => {
-  closeContextMenu();
-  document.body.replaceChildren();
-});
-
-function labels(): string[] {
-  return [...document.querySelectorAll(".context-menu-item")].map((b) => b.textContent ?? "");
-}
-
-describe("context menu (#125)", () => {
-  it("renders one item per entry, in order", () => {
-    openContextMenu(10, 20, [
-      { label: "Rename…", onSelect: () => {} },
-      { label: "Kill session", onSelect: () => {}, danger: true },
-    ]);
-    expect(labels()).toEqual(["Rename…", "Kill session"]);
-    expect(document.querySelector(".context-menu-item.is-danger")?.textContent).toBe(
-      "Kill session",
-    );
-  });
-
-  it("runs the selected entry and closes", () => {
-    const chosen = vi.fn();
-    openContextMenu(0, 0, [{ label: "Rename…", onSelect: chosen }]);
-    (document.querySelector(".context-menu-item") as HTMLButtonElement).click();
-    expect(chosen).toHaveBeenCalledOnce();
-    expect(document.querySelector(".context-menu")).toBeNull();
-  });
-
-  it("opening a second menu replaces the first", () => {
-    openContextMenu(0, 0, [{ label: "first", onSelect: () => {} }]);
-    openContextMenu(0, 0, [{ label: "second", onSelect: () => {} }]);
-    expect(document.querySelectorAll(".context-menu")).toHaveLength(1);
-    expect(labels()).toEqual(["second"]);
-  });
-
-  it("closes on Escape and on a press outside it", () => {
-    openContextMenu(0, 0, [{ label: "Rename…", onSelect: () => {} }]);
-    window.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape" }));
-    expect(document.querySelector(".context-menu")).toBeNull();
-
-    openContextMenu(0, 0, [{ label: "Rename…", onSelect: () => {} }]);
-    document.body.dispatchEvent(new Event("pointerdown", { bubbles: true }));
-    expect(document.querySelector(".context-menu")).toBeNull();
-  });
-
-  it("stays open for a press inside itself", () => {
-    openContextMenu(0, 0, [{ label: "Rename…", onSelect: () => {} }]);
-    const menu = document.querySelector(".context-menu") as HTMLElement;
-    menu.dispatchEvent(new Event("pointerdown", { bubbles: true }));
-    expect(document.querySelector(".context-menu")).not.toBeNull();
-  });
-});

web/src/contextMenu.ts

@@ -1,81 +0,0 @@
-/** Custom right-click menu (#125).
- *
- * One menu exists at a time: opening a second closes the first. The menu is
- * appended to `<body>` rather than to the row it belongs to, so an overflowing
- * sidebar cannot clip it.
- */
-
-export interface ContextMenuItem {
-  label: string;
-  onSelect: () => void;
-  /** Renders the entry in the destructive style. */
-  danger?: boolean;
-}
-
-let open: { el: HTMLElement; dispose: () => void } | null = null;
-
-/** Close the menu that is currently up, if any. */
-export function closeContextMenu(): void {
-  open?.dispose();
-}
-
-/**
- * Open a menu at viewport coordinates `x`/`y`. The menu closes on selection,
- * on Escape, on a pointer press anywhere outside it, and on scroll or resize —
- * a menu anchored to coordinates goes stale the moment the page moves under it.
- */
-export function openContextMenu(x: number, y: number, items: ContextMenuItem[]): HTMLElement {
-  closeContextMenu();
-
-  const el = document.createElement("div");
-  el.className = "context-menu";
-  el.setAttribute("role", "menu");
-  for (const item of items) {
-    const btn = document.createElement("button");
-    btn.type = "button";
-    btn.className = item.danger ? "context-menu-item is-danger" : "context-menu-item";
-    btn.setAttribute("role", "menuitem");
-    btn.textContent = item.label;
-    btn.addEventListener("click", (ev) => {
-      ev.preventDefault();
-      ev.stopPropagation();
-      closeContextMenu();
-      item.onSelect();
-    });
-    el.appendChild(btn);
-  }
-  document.body.appendChild(el);
-
-  // Nudge back inside the viewport when the click was near an edge. happy-dom
-  // reports 0 for every measurement, which lands the menu at the click point —
-  // the same place it would sit with room to spare.
-  const rect = el.getBoundingClientRect();
-  const maxX = window.innerWidth - rect.width;
-  const maxY = window.innerHeight - rect.height;
-  el.style.left = `${Math.max(0, Math.min(x, maxX))}px`;
-  el.style.top = `${Math.max(0, Math.min(y, maxY))}px`;
-
-  const onPointerDown = (ev: Event) => {
-    if (!el.contains(ev.target as Node)) closeContextMenu();
-  };
-  const onKeyDown = (ev: KeyboardEvent) => {
-    if (ev.key === "Escape") closeContextMenu();
-  };
-  const dispose = () => {
-    if (open?.el !== el) return;
-    open = null;
-    el.remove();
-    window.removeEventListener("pointerdown", onPointerDown, true);
-    window.removeEventListener("keydown", onKeyDown, true);
-    window.removeEventListener("scroll", closeContextMenu, true);
-    window.removeEventListener("resize", closeContextMenu);
-  };
-  window.addEventListener("pointerdown", onPointerDown, true);
-  window.addEventListener("keydown", onKeyDown, true);
-  window.addEventListener("scroll", closeContextMenu, true);
-  window.addEventListener("resize", closeContextMenu);
-
-  open = { el, dispose };
-  (el.firstElementChild as HTMLElement | null)?.focus();
-  return el;
-}

web/src/daemonLink.ts

@@ -1,229 +0,0 @@
-// The link to the daemon behind this page: is it up, and which release is it?
-// The sidebar's status indicator and the restart overlay both read this one
-// controller. See docs/RESTART.md for the restart contract it implements.
-
-import { getDaemonInfo } from "./api.js";
-import type { Scheduler } from "./events.js";
-import type { BuildInfo, DaemonInfo } from "./types.js";
-
-/**
- * - `connecting` — first probe hasn't landed yet.
- * - `online` — the daemon answered and is the same process, or a resolved new one.
- * - `reconnecting` — the socket dropped, but within the grace window; a blip
- *   shouldn't throw a modal in the user's face.
- * - `down` — unreachable past the grace window: the overlay blocks the UI and
- *   the poll runs until it answers.
- * - `updating` — it answered on a different commit; the page is reloading and
- *   stays blocked until it does.
- */
-export type LinkState = "connecting" | "online" | "reconnecting" | "down" | "updating";
-
-export interface LinkStatus {
-  state: LinkState;
-  /** The release the daemon last reported. Undefined until the first probe,
-   *  and on a daemon too old to carry one. */
-  build?: BuildInfo;
-  /** Hostname the daemon reports, for the indicator's tooltip. */
-  hostname?: string;
-  /** How many probes have failed in the current outage — the overlay counts
-   *  attempts so a long restart doesn't look frozen. */
-  attempts: number;
-}
-
-/** What happened between two `/api/info` replies. */
-export type RestartKind = "same" | "restarted" | "upgraded";
-
-/** How long a dropped socket may stay dropped before the UI blocks. Long enough
- *  to ride out a wifi hiccup, short enough that a real restart is visible. */
-export const GRACE_MS = 1200;
-/** Cadence of the `/api/info` poll while the daemon is unreachable. */
-export const POLL_MS = 700;
-
-const browserScheduler: Scheduler = {
-  setTimer: (fn, ms) => window.setTimeout(fn, ms),
-  clearTimer: (h) => window.clearTimeout(h),
-};
-
-/**
- * Compare two daemon replies.
- *
- * The commit decides first: a different one means new code, which for a browser
- * means new assets. The per-process `instance` catches the rest — a restart of
- * the same build, which needs no reload. A daemon built outside a git checkout
- * reports an empty commit, so an empty-vs-empty pair never counts as an
- * upgrade; the instance still reports the restart.
- */
-export function compareIdentity(before: DaemonInfo, after: DaemonInfo): RestartKind {
-  const a = before.build?.commit ?? "";
-  const b = after.build?.commit ?? "";
-  if (a && b && a !== b) return "upgraded";
-  if (before.instance && after.instance && before.instance !== after.instance) return "restarted";
-  return "same";
-}
-
-/** One line naming a release: `f89be4a716c7 · 2026-09-02`, with `(dirty)` when
- *  the build carried uncommitted changes. Empty builds say so rather than
- *  rendering a blank tooltip. */
-export function formatRelease(build: BuildInfo | undefined): string {
-  if (!build?.commit) return "unknown release";
-  const day = build.commit_date ? build.commit_date.slice(0, 10) : "";
-  const parts = [build.commit];
-  if (day) parts.push(`· ${day}`);
-  if (build.dirty) parts.push("(dirty)");
-  return parts.join(" ");
-}
-
-export interface DaemonLinkOptions {
-  /** Injectable for tests; defaults to `GET /api/info`. */
-  fetchInfo?: () => Promise<DaemonInfo>;
-  scheduler?: Scheduler;
-  /** What an upgrade does. Injectable so tests don't navigate. */
-  reload?: () => void;
-  graceMs?: number;
-  pollMs?: number;
-}
-
-export type LinkListener = (status: LinkStatus) => void;
-
-export class DaemonLink {
-  private state: LinkState = "connecting";
-  private identity: DaemonInfo | null = null;
-  private attempts = 0;
-  private graceTimer: number | null = null;
-  private pollTimer: number | null = null;
-  private readonly listeners = new Set<LinkListener>();
-  private readonly fetchInfo: () => Promise<DaemonInfo>;
-  private readonly scheduler: Scheduler;
-  private readonly reload: () => void;
-  private readonly graceMs: number;
-  private readonly pollMs: number;
-
-  constructor(opts: DaemonLinkOptions = {}) {
-    this.fetchInfo = opts.fetchInfo ?? getDaemonInfo;
-    this.scheduler = opts.scheduler ?? browserScheduler;
-    this.reload = opts.reload ?? (() => window.location.reload());
-    this.graceMs = opts.graceMs ?? GRACE_MS;
-    this.pollMs = opts.pollMs ?? POLL_MS;
-  }
-
-  /** Record the release we started against. Everything later is a diff on it. */
-  async start(): Promise<void> {
-    await this.probe();
-  }
-
-  status(): LinkStatus {
-    return {
-      state: this.state,
-      build: this.identity?.build,
-      hostname: this.identity?.hostname,
-      attempts: this.attempts,
-    };
-  }
-
-  subscribe(listener: LinkListener): () => void {
-    this.listeners.add(listener);
-    listener(this.status());
-    return () => this.listeners.delete(listener);
-  }
-
-  /** The events socket dropped. Starts the grace timer and the poll. */
-  noteDisconnected(): void {
-    if (this.state === "down" || this.state === "updating") return;
-    this.attempts = 0;
-    this.setState("reconnecting");
-    if (this.graceTimer === null) {
-      this.graceTimer = this.scheduler.setTimer(() => {
-        this.graceTimer = null;
-        if (this.state === "reconnecting") this.setState("down");
-        void this.poll();
-      }, this.graceMs);
-    }
-  }
-
-  /** The events socket came back. It carries no identity of its own, so the
-   *  state only clears once a probe confirms *which* daemon answered — a
-   *  reconnect to an upgraded daemon must reload, not resume. */
-  noteConnected(): void {
-    if (this.state === "online" || this.state === "updating") return;
-    void this.probe();
-  }
-
-  /**
-   * Recheck liveness after the browser resumes from the background. Mobile
-   * browsers may suspend both WebSocket events and timers while a PWA is
-   * hidden, leaving a stale `down` state after the daemon is already back.
-   */
-  recover(): void {
-    if (this.state === "updating") return;
-    this.noteDisconnected();
-    void this.probe();
-  }
-
-  /**
-   * One `/api/info` round-trip. Resolves `true` when the daemon answered.
-   *
-   * A first answer becomes the baseline. A later one that differs on commit
-   * reloads the page; anything else (plain restart, or the same process) puts
-   * the UI back online.
-   */
-  async probe(): Promise<boolean> {
-    let info: DaemonInfo;
-    try {
-      info = await this.fetchInfo();
-    } catch {
-      this.attempts += 1;
-      this.emit();
-      return false;
-    }
-    const before = this.identity;
-    this.identity = info;
-    if (before && compareIdentity(before, info) === "upgraded") {
-      // Stay blocked through the reload: an unlocked frame here would let the
-      // user drive new server code from the bundle it just replaced.
-      this.setState("updating");
-      this.reload();
-      return true;
-    }
-    this.attempts = 0;
-    this.clearTimers();
-    this.setState("online");
-    return true;
-  }
-
-  /** Stop polling. The page's own teardown; not used in normal operation. */
-  stop(): void {
-    this.clearTimers();
-  }
-
-  private async poll(): Promise<void> {
-    if (this.state === "online" || this.state === "updating") return;
-    const ok = await this.probe();
-    if (ok || this.pollTimer !== null) return;
-    this.pollTimer = this.scheduler.setTimer(() => {
-      this.pollTimer = null;
-      void this.poll();
-    }, this.pollMs);
-  }
-
-  private clearTimers(): void {
-    if (this.graceTimer !== null) {
-      this.scheduler.clearTimer(this.graceTimer);
-      this.graceTimer = null;
-    }
-    if (this.pollTimer !== null) {
-      this.scheduler.clearTimer(this.pollTimer);
-      this.pollTimer = null;
-    }
-  }
-
-  private setState(state: LinkState): void {
-    if (this.state === state) return;
-    this.state = state;
-    this.emit();
-  }
-
-  private emit(): void {
-    const s = this.status();
-    for (const fn of this.listeners) fn(s);
-  }
-}

web/src/debug.ts

@@ -1,41 +0,0 @@
-// Debug-HUD toggle (#20). Off by default; persisted in localStorage so it
-// survives reloads, flipped by a keybind (Ctrl+Shift+D), and force-enabled by
-// `?hud` in dev. A `maestro-hud-toggle` event lets the HUD re-render on change.
-
-import { CommandSet, defineCommands } from "./commands.js";
-
-const STORAGE_KEY = "maestro:hud";
-export const HUD_TOGGLE_EVENT = "maestro-hud-toggle";
-
-/** Whether the debug HUD should be shown. */
-export function isHudEnabled(): boolean {
-  if (import.meta.env.DEV && location.search.includes("hud")) return true;
-  try {
-    return localStorage.getItem(STORAGE_KEY) === "1";
-  } catch {
-    // Private-mode / storage-disabled: HUD just stays off.
-    return false;
-  }
-}
-
-/** Persist the HUD on/off state and notify listeners. */
-export function setHudEnabled(on: boolean): void {
-  try {
-    if (on) localStorage.setItem(STORAGE_KEY, "1");
-    else localStorage.removeItem(STORAGE_KEY);
-  } catch {
-    // ignore storage failures — the event still drives the in-memory HUD
-  }
-  window.dispatchEvent(new CustomEvent(HUD_TOGGLE_EVENT));
-}
-
-export function toggleHud(): void {
-  setHudEnabled(!isHudEnabled());
-}
-
-const hudKeys = new CommandSet(defineCommands({ "debug.toggleHud": () => toggleHud() }));
-
-/** Global keybind: Ctrl+Shift+D toggles the debug HUD. */
-export function installHudKeybind(): void {
-  window.addEventListener("keydown", (e) => hudKeys.handle(e));
-}

web/src/dirAutocomplete.test.ts

@@ -1,143 +0,0 @@
-// @vitest-environment happy-dom
-import { beforeEach, afterEach, describe, expect, it, vi } from "vitest";
-
-vi.mock("./api.js", () => ({ listDir: vi.fn() }));
-
-import { attachDirAutocomplete, type DirAutocompleteHandle } from "./dirAutocomplete.js";
-import { listDir } from "./api.js";
-
-const listDirMock = vi.mocked(listDir);
-
-let input: HTMLInputElement;
-let nextField: HTMLInputElement;
-let docKeydown: ReturnType<typeof vi.fn>;
-let ac: DirAutocompleteHandle | undefined;
-
-function popup(): HTMLUListElement {
-  return document.querySelector(".dir-ac") as HTMLUListElement;
-}
-
-function items(): HTMLElement[] {
-  return [...popup().querySelectorAll<HTMLElement>(".dir-ac-item")];
-}
-
-async function type(value: string): Promise<void> {
-  input.focus();
-  input.value = value;
-  input.dispatchEvent(new Event("input", { bubbles: true }));
-  await vi.advanceTimersByTimeAsync(100); // past the fetch debounce
-}
-
-/** Dispatch a cancelable, bubbling keydown on the input; report whether the
- * default browser behaviour (focus move, form submit) was suppressed. */
-function press(key: string): { defaultPrevented: boolean } {
-  const evt = new KeyboardEvent("keydown", { key, bubbles: true, cancelable: true });
-  input.dispatchEvent(evt);
-  return { defaultPrevented: evt.defaultPrevented };
-}
-
-beforeEach(() => {
-  vi.useFakeTimers();
-  document.body.replaceChildren();
-  input = document.createElement("input");
-  nextField = document.createElement("input");
-  document.body.append(input, nextField);
-  docKeydown = vi.fn();
-  document.addEventListener("keydown", docKeydown);
-  listDirMock.mockReset().mockResolvedValue({ path: "/tmp", entries: ["proj-a", "proj-b", "other"], truncated: false });
-});
-
-afterEach(() => {
-  ac?.destroy();
-  document.removeEventListener("keydown", docKeydown);
-  vi.useRealTimers();
-});
-
-describe("dirAutocomplete dismissal", () => {
-  it("Escape closes the popup, keeps the typed value and does not propagate", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/pro");
-    expect(popup().hidden).toBe(false);
-
-    const { defaultPrevented } = press("Escape");
-
-    expect(defaultPrevented).toBe(true);
-    expect(popup().hidden).toBe(true);
-    expect(input.value).toBe("/tmp/pro");
-    expect(document.activeElement).toBe(input);
-    expect(docKeydown).not.toHaveBeenCalled(); // a draft pane's Escape handler must not fire
-  });
-
-  it("blur dismisses the popup", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/pro");
-    expect(popup().hidden).toBe(false);
-
-    input.blur();
-    await vi.advanceTimersByTimeAsync(150);
-
-    expect(popup().hidden).toBe(true);
-  });
-
-  it("does not reopen on refocus until the operator types again", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/pro");
-    input.blur();
-    await vi.advanceTimersByTimeAsync(150);
-
-    input.focus();
-    await vi.advanceTimersByTimeAsync(150);
-    expect(popup().hidden).toBe(true);
-
-    await type("/tmp/ot");
-    expect(popup().hidden).toBe(false);
-  });
-});
-
-describe("dirAutocomplete keyboard model", () => {
-  it("Tab commits the highlighted entry and lets focus move to the next field", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/pro"); // highlight defaults to the first match: proj-a
-
-    nextField.focus();
-    const { defaultPrevented } = press("Tab");
-
-    expect(input.value).toBe("/tmp/proj-a/");
-    expect(defaultPrevented).toBe(false); // native tab navigation proceeds
-    expect(document.activeElement).toBe(nextField); // focus was not yanked back
-  });
-
-  it("Tab with nothing highlighted just moves on", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/nope-matches-nothing");
-    expect(popup().hidden).toBe(true);
-
-    const { defaultPrevented } = press("Tab");
-
-    expect(defaultPrevented).toBe(false);
-    expect(input.value).toBe("/tmp/nope-matches-nothing");
-  });
-
-  it("arrows move the highlight and Enter commits it without submitting", async () => {
-    ac = attachDirAutocomplete(input);
-    await type("/tmp/");
-
-    press("ArrowDown");
-    expect(items()[1].classList.contains("is-active")).toBe(true);
-
-    const enter = press("Enter");
-    expect(enter.defaultPrevented).toBe(true); // no form submit
-    expect(input.value).toBe("/tmp/proj-b/");
-  });
-});
-
-describe("dirAutocomplete opening", () => {
-  it("still opens on focus when not previously dismissed", async () => {
-    ac = attachDirAutocomplete(input);
-    input.focus();
-    await vi.advanceTimersByTimeAsync(50);
-
-    expect(popup().hidden).toBe(false);
-    expect(listDirMock).toHaveBeenCalled();
-  });
-});

web/src/dirAutocomplete.ts

@@ -1,235 +0,0 @@
-// Shell-style directory autocomplete for a path <input> (NAP-329).
-//
-// Lists one directory at a time over the live `GET /api/dirs` endpoint, caches
-// per directory, and filters the trailing path segment locally — so typing within a segment is instant and only crossing a `/`
-// hits the network. Keyboard model mirrors `cd dir/sub<tab>`:
-//
-//   Tab    commit the highlighted entry and let focus move on; with nothing
-//          highlighted, plain tab navigation
-//   ↑/↓    move the highlight
-//   Enter  accept the highlighted entry (and suppress form submit)
-//   Esc    close the dropdown, refocus the input, and swallow the key so it
-//          can't also discard the surrounding spawn modal
-//
-// Once dismissed (Esc or blur) the popup stays closed until the operator types
-// again — refocusing alone doesn't reopen it.
-//
-// Failures (offline daemon, permission denied) degrade to no suggestions.
-
-import { splitPath } from "./paths.js";
-import { listDir } from "./api.js";
-
-export interface DirAutocompleteHandle {
-  destroy(): void;
-}
-
-/** Most entries we render at once — a long list is unhelpful and slow. */
-const MAX_VISIBLE = 60;
-/** Debounce before a network fetch when the user crosses into a new directory. */
-const FETCH_DEBOUNCE_MS = 90;
-
-/** Split a path value into the directory to list and the trailing fragment
- * being typed within it. The directory keeps its trailing `/` (or is empty,
- * meaning "the daemon's home dir"). */
-export function attachDirAutocomplete(input: HTMLInputElement): DirAutocompleteHandle {
-  const dropdown = document.createElement("ul");
-  dropdown.className = "dir-ac";
-  dropdown.setAttribute("role", "listbox");
-  dropdown.hidden = true;
-  document.body.appendChild(dropdown);
-
-  // `dir -> entries`. Successful listings only; errors aren't cached so a
-  // transient failure can recover on the next keystroke.
-  const cache = new Map<string, string[]>();
-  let filtered: string[] = [];
-  let highlight = -1;
-  let fetchSeq = 0;
-  let debounce: number | undefined;
-  let open = false;
-  // Set when the operator dismissed the popup (Esc, blur, outside click); a
-  // refocus must not reopen it — only new typing does.
-  let dismissed = false;
-
-
-  function close(): void {
-    if (!open) return;
-    open = false;
-    dropdown.hidden = true;
-    dropdown.replaceChildren();
-    highlight = -1;
-    window.removeEventListener("scroll", reposition, true);
-    window.removeEventListener("resize", reposition);
-  }
-
-  function dismiss(): void {
-    dismissed = true;
-    close();
-  }
-
-  function reposition(): void {
-    const r = input.getBoundingClientRect();
-    dropdown.style.left = `${r.left}px`;
-    dropdown.style.top = `${r.bottom + 4}px`;
-    dropdown.style.width = `${r.width}px`;
-  }
-
-  function render(): void {
-    dropdown.replaceChildren();
-    if (filtered.length === 0) {
-      close();
-      return;
-    }
-    const shown = filtered.slice(0, MAX_VISIBLE);
-    shown.forEach((name, i) => {
-      const li = document.createElement("li");
-      li.className = "dir-ac-item" + (i === highlight ? " is-active" : "");
-      li.setAttribute("role", "option");
-      li.setAttribute("aria-selected", String(i === highlight));
-      li.textContent = name + "/";
-      // mousedown (not click) so we accept before the input's blur fires.
-      li.addEventListener("mousedown", (e) => {
-        e.preventDefault();
-        accept(name);
-      });
-      dropdown.appendChild(li);
-    });
-    if (filtered.length > MAX_VISIBLE) {
-      const more = document.createElement("li");
-      more.className = "dir-ac-more";
-      more.textContent = `+${filtered.length - MAX_VISIBLE} more — keep typing to narrow`;
-      dropdown.appendChild(more);
-    }
-    if (!open) {
-      open = true;
-      dropdown.hidden = false;
-      window.addEventListener("scroll", reposition, true);
-      window.addEventListener("resize", reposition);
-    }
-    reposition();
-  }
-
-  function applyFilter(entries: string[], prefix: string): void {
-    // A fetch can outlive the dismissal that was meant to close this popup
-    // (Tab-commit re-arms a refresh, then blur dismisses 120ms later). Showing
-    // it now would anchor a dropdown under an unfocused input that nothing
-    // closes until the next interaction.
-    if (dismissed || document.activeElement !== input) {
-      close();
-      return;
-    }
-    const lower = prefix.toLowerCase();
-    filtered = entries.filter((e) => e.toLowerCase().startsWith(lower));
-    highlight = filtered.length > 0 ? 0 : -1;
-    render();
-  }
-
-  // Fetch (or read from cache) the listing for the directory currently implied
-  // by the input, then filter by the trailing fragment.
-  function refresh(): void {
-    const { dir, prefix } = splitPath(input.value);
-    const cached = cache.get(dir);
-    if (cached) {
-      applyFilter(cached, prefix);
-      return;
-    }
-    const seq = ++fetchSeq;
-    listDir(dir)
-      .then((listing) => {
-        cache.set(dir, listing.entries);
-        if (seq !== fetchSeq) return; // a newer fetch superseded this one
-        // The input may have changed while in flight; re-split before filtering.
-        const cur = splitPath(input.value);
-        if (cur.dir === dir) applyFilter(listing.entries, cur.prefix);
-      })
-      .catch(() => {
-        if (seq === fetchSeq) close();
-      });
-  }
-
-  function scheduleRefresh(): void {
-    window.clearTimeout(debounce);
-    debounce = window.setTimeout(refresh, FETCH_DEBOUNCE_MS);
-  }
-
-  // Accept `name` as the next path segment: complete it and append `/` so the
-  // child directory's listing loads on the next interaction (the drill-in
-  // gesture). Unlike `accept`, doesn't steal focus — Tab uses this to commit
-  // and move to the next field in one gesture.
-  function commit(name: string): void {
-    const { dir } = splitPath(input.value);
-    input.value = `${dir}${name}/`;
-    // Notify other listeners (spawnForm marks the field user-edited).
-    input.dispatchEvent(new Event("input", { bubbles: true }));
-  }
-
-  function accept(name: string): void {
-    commit(name);
-    input.focus();
-  }
-
-  function onInput(): void {
-    dismissed = false;
-    scheduleRefresh();
-  }
-
-  function onFocus(): void {
-    if (dismissed) return;
-    refresh();
-  }
-
-  function onKeydown(e: KeyboardEvent): void {
-    if (e.key === "Escape") {
-      if (open) {
-        e.preventDefault();
-        // Swallow the key: an Escape that bubbles would also close the
-        // spawn modal hosting this form.
-        e.stopPropagation();
-        dismiss();
-        input.focus();
-      }
-      return;
-    }
-    if (e.key === "Tab") {
-      if (!open || highlight < 0 || highlight >= filtered.length) return; // plain tab navigation
-      commit(filtered[highlight]); // no preventDefault — focus moves to the next field
-      return;
-    }
-    if (!open) return;
-    if (e.key === "ArrowDown") {
-      e.preventDefault();
-      highlight = Math.min(highlight + 1, filtered.length - 1);
-      render();
-    } else if (e.key === "ArrowUp") {
-      e.preventDefault();
-      highlight = Math.max(highlight - 1, 0);
-      render();
-    } else if (e.key === "Enter") {
-      if (highlight >= 0 && highlight < filtered.length) {
-        e.preventDefault(); // accept the entry instead of submitting the form
-        accept(filtered[highlight]);
-      }
-    }
-  }
-
-  function onBlur(): void {
-    // Delay so a dropdown mousedown can complete first.
-    window.setTimeout(dismiss, 120);
-  }
-
-  input.addEventListener("input", onInput);
-  input.addEventListener("focus", onFocus);
-  input.addEventListener("keydown", onKeydown);
-  input.addEventListener("blur", onBlur);
-
-  return {
-    destroy() {
-      window.clearTimeout(debounce);
-      close();
-      input.removeEventListener("input", onInput);
-      input.removeEventListener("focus", onFocus);
-      input.removeEventListener("keydown", onKeydown);
-      input.removeEventListener("blur", onBlur);
-      dropdown.remove();
-    },
-  };
-}

web/src/drawer.test.ts

@@ -1,47 +0,0 @@
-// @vitest-environment happy-dom
-import { beforeEach, describe, expect, it } from "vitest";
-
-import { OPEN_SPAWN_EVENT, SPAWN_SIMILAR_EVENT } from "./catalog.js";
-import { installDrawer, type Drawer } from "./drawer.js";
-
-function mount(): { shell: HTMLElement; sidebar: HTMLElement; drawer: Drawer } {
-  const shell = document.createElement("div");
-  const sidebar = document.createElement("aside");
-  const backdrop = document.createElement("div");
-  const row = document.createElement("div");
-  row.className = "tree-leaf";
-  sidebar.appendChild(row);
-  shell.append(sidebar, backdrop);
-  document.body.replaceChildren(shell);
-  const drawer = installDrawer(shell, sidebar, backdrop);
-  drawer.open();
-  return { shell, sidebar, drawer };
-}
-
-describe("mobile drawer", () => {
-  beforeEach(() => document.body.replaceChildren());
-
-  it("closes when a session row is tapped", () => {
-    const { shell, sidebar } = mount();
-    (sidebar.querySelector(".tree-leaf") as HTMLElement).click();
-    expect(shell.classList.contains("drawer-open")).toBe(false);
-  });
-
-  it("closes when a spawn is requested", () => {
-    const { shell } = mount();
-    document.dispatchEvent(new CustomEvent(OPEN_SPAWN_EVENT));
-    expect(shell.classList.contains("drawer-open")).toBe(false);
-  });
-
-  it("closes when spawn similar is requested", () => {
-    const { shell } = mount();
-    document.dispatchEvent(new CustomEvent(SPAWN_SIMILAR_EVENT, { detail: {} }));
-    expect(shell.classList.contains("drawer-open")).toBe(false);
-  });
-
-  it("leaves the backdrop click closing it", () => {
-    const { shell } = mount();
-    (shell.lastElementChild as HTMLElement).click();
-    expect(shell.classList.contains("drawer-open")).toBe(false);
-  });
-});

web/src/drawer.ts

@@ -1,83 +0,0 @@
-// Mobile off-canvas sidebar (issue #35); on desktop the `drawer-open` class is
-// inert (CSS gates the drawer styling).
-//
-// Anything that puts a new view in the content area must close the drawer, or
-// it renders behind the sidebar and the tap reads as a dead button. "Spawn
-// similar" sits inside a session row but stops propagation, so it never reaches
-// the row's own close — both spawn paths arrive here via document events.
-
-import { OPEN_SPAWN_EVENT, SPAWN_SIMILAR_EVENT } from "./catalog.js";
-
-/** Toggling the drawer from outside the shell (the pane header's ☰ on mobile),
- *  without threading the controller through every view. */
-export const TOGGLE_DRAWER_EVENT = "maestro-toggle-drawer";
-
-export function requestToggleDrawer(): void {
-  document.dispatchEvent(new CustomEvent(TOGGLE_DRAWER_EVENT));
-}
-
-export interface Drawer {
-  open(): void;
-  close(): void;
-  toggle(): void;
-  isOpen(): boolean;
-}
-
-export function installDrawer(
-  shellEl: HTMLElement,
-  sidebarEl: HTMLElement,
-  backdropEl: HTMLElement,
-): Drawer {
-  const drawer: Drawer = {
-    open: () => shellEl.classList.add("drawer-open"),
-    close: () => shellEl.classList.remove("drawer-open"),
-    toggle: () => shellEl.classList.toggle("drawer-open"),
-    isOpen: () => shellEl.classList.contains("drawer-open"),
-  };
-
-  backdropEl.addEventListener("click", () => drawer.close());
-  sidebarEl.addEventListener("click", (e) => {
-    if ((e.target as HTMLElement).closest(".tree-leaf")) drawer.close();
-  });
-  document.addEventListener(TOGGLE_DRAWER_EVENT, () => drawer.toggle());
-  document.addEventListener(OPEN_SPAWN_EVENT, () => drawer.close());
-  document.addEventListener(SPAWN_SIMILAR_EVENT, () => drawer.close());
-
-  return drawer;
-}
-
-/** Horizontal swipes drive the drawer (right opens, left closes) rather than
- *  the browser's back/forward navigation. Only a clearly horizontal gesture past
- *  a threshold counts, so vertical terminal scrolling (which owns its own touch
- *  handler) is untouched. */
-export function installDrawerSwipe(drawer: Drawer): void {
-  const mobileMq = window.matchMedia("(max-width: 859px)");
-  let sx = 0;
-  let sy = 0;
-  let tracking = false;
-  document.addEventListener(
-    "touchstart",
-    (e) => {
-      tracking = mobileMq.matches && e.touches.length === 1;
-      if (tracking) {
-        sx = e.touches[0].clientX;
-        sy = e.touches[0].clientY;
-      }
-    },
-    { passive: true },
-  );
-  document.addEventListener(
-    "touchend",
-    (e) => {
-      if (!tracking) return;
-      tracking = false;
-      const t = e.changedTouches[0];
-      const dx = t.clientX - sx;
-      const dy = t.clientY - sy;
-      if (Math.abs(dx) < 60 || Math.abs(dx) < Math.abs(dy) * 1.5) return;
-      if (dx > 0 && !drawer.isOpen()) drawer.open();
-      else if (dx < 0 && drawer.isOpen()) drawer.close();
-    },
-    { passive: true },
-  );
-}

web/src/events.test.ts

@@ -1,195 +0,0 @@
-import { describe, expect, it, vi } from "vitest";
-
-import {
-  CatalogStore,
-  INITIAL_BACKOFF_MS,
-  MAX_BACKOFF_MS,
-  type CatalogState,
-  type Scheduler,
-} from "./events.js";
-import type { CatalogEvent, Session } from "./types.js";
-
-function session(id: string): Session {
-  return {
-    id,
-    cwd: "/home/n",
-    command: "bash",
-    env: {},
-    metadata: {},
-    status: "Running",
-    created_at: "2026-08-22T00:00:00Z",
-  } as Session;
-}
-
-/** Just enough of a WebSocket for the store to drive, plus a way to push frames. */
-class FakeSocket {
-  onmessage: ((ev: { data: string }) => void) | null = null;
-  onopen: (() => void) | null = null;
-  onclose: (() => void) | null = null;
-  onerror: (() => void) | null = null;
-  closed = false;
-
-  close(): void {
-    this.closed = true;
-  }
-
-  open(): void {
-    this.onopen?.();
-  }
-
-  emit(event: CatalogEvent): void {
-    this.onmessage?.({ data: JSON.stringify(event) });
-  }
-
-  drop(): void {
-    this.onclose?.();
-  }
-}
-
-/** Scheduler that records delays instead of waiting them out. */
-function fakeScheduler(): Scheduler & { delays: number[]; runNext(): void } {
-  const queued: Array<() => void> = [];
-  return {
-    delays: [] as number[],
-    setTimer(fn, ms) {
-      this.delays.push(ms);
-      queued.push(fn);
-      return queued.length;
-    },
-    clearTimer() {},
-    runNext() {
-      queued.shift()?.();
-    },
-  };
-}
-
-function storeWith(sockets: FakeSocket[], refetch?: () => Promise<Session[]>) {
-  let i = 0;
-  const scheduler = fakeScheduler();
-  const store = new CatalogStore({
-    socket: () => sockets[i++] as unknown as WebSocket,
-    scheduler,
-    refetch,
-  });
-  return { store, scheduler };
-}
-
-describe("CatalogStore reducer", () => {
-  it("replaces state on Snapshot and applies deltas", () => {
-    const ws = new FakeSocket();
-    const { store } = storeWith([ws]);
-    store.start();
-
-    ws.emit({ type: "Snapshot", sessions: [session("a")] } as CatalogEvent);
-    expect([...store.snapshot().sessions.keys()]).toEqual(["a"]);
-
-    ws.emit({ type: "SessionAdded", session: session("b") } as CatalogEvent);
-    expect([...store.snapshot().sessions.keys()].sort()).toEqual(["a", "b"]);
-
-    ws.emit({ type: "SessionRemoved", id: "a" } as CatalogEvent);
-    expect([...store.snapshot().sessions.keys()]).toEqual(["b"]);
-  });
-
-  it("ignores a frame that is not JSON", () => {
-    const ws = new FakeSocket();
-    const { store } = storeWith([ws]);
-    store.start();
-    ws.emit({ type: "Snapshot", sessions: [session("a")] } as CatalogEvent);
-
-    ws.onmessage?.({ data: "not json" });
-
-    expect([...store.snapshot().sessions.keys()]).toEqual(["a"]);
-  });
-
-  it("refetches over REST when the server reports dropped frames", async () => {
-    const ws = new FakeSocket();
-    const refetch = vi.fn(async () => [session("fresh")]);
-    const { store } = storeWith([ws], refetch);
-    store.start();
-    ws.emit({ type: "Snapshot", sessions: [session("stale")] } as CatalogEvent);
-
-    ws.emit({ type: "Lagged", skipped: 4 } as CatalogEvent);
-    await vi.waitFor(() => expect(refetch).toHaveBeenCalledOnce());
-
-    expect([...store.snapshot().sessions.keys()]).toEqual(["fresh"]);
-  });
-
-  it("hands each subscriber a copy it can diff against the next one", () => {
-    const ws = new FakeSocket();
-    const { store } = storeWith([ws]);
-    const seen: CatalogState[] = [];
-    store.subscribe((s) => seen.push(s));
-    store.start();
-
-    ws.emit({ type: "Snapshot", sessions: [session("a")] } as CatalogEvent);
-    ws.emit({ type: "SessionAdded", session: session("b") } as CatalogEvent);
-
-    const [, afterSnapshot, afterAdd] = seen;
-    expect(afterSnapshot.sessions).not.toBe(afterAdd.sessions);
-    expect(afterSnapshot.sessions.size).toBe(1);
-    expect(afterAdd.sessions.size).toBe(2);
-  });
-});
-
-describe("CatalogStore reconnect", () => {
-  it("replaces a suspended socket immediately", () => {
-    const first = new FakeSocket();
-    const second = new FakeSocket();
-    const { store } = storeWith([first, second]);
-    store.start();
-
-    store.reconnect();
-
-    expect(first.closed).toBe(true);
-    second.open();
-    // A late close from the old socket is deliberately ignored.
-    first.drop();
-    expect(store.backoff()).toBe(INITIAL_BACKOFF_MS);
-  });
-
-  it("doubles the delay per attempt and caps it", () => {
-    const sockets = Array.from({ length: 8 }, () => new FakeSocket());
-    const { store, scheduler } = storeWith(sockets);
-    store.start();
-
-    for (let i = 0; i < 7; i++) {
-      sockets[i].drop();
-      scheduler.runNext();
-    }
-
-    expect(scheduler.delays[0]).toBe(INITIAL_BACKOFF_MS);
-    expect(scheduler.delays[1]).toBe(INITIAL_BACKOFF_MS * 2);
-    expect(scheduler.delays.at(-1)).toBe(MAX_BACKOFF_MS);
-  });
-
-  it("resets the delay once a connection opens", () => {
-    const sockets = [new FakeSocket(), new FakeSocket(), new FakeSocket()];
-    const { store, scheduler } = storeWith(sockets);
-    store.start();
-
-    sockets[0].drop();
-    scheduler.runNext();
-    expect(store.backoff()).toBe(INITIAL_BACKOFF_MS * 2);
-
-    sockets[1].open();
-    expect(store.backoff()).toBe(INITIAL_BACKOFF_MS);
-  });
-});
-
-describe("connection listeners", () => {
-  it("report the socket opening and dropping", () => {
-    const sock = new FakeSocket();
-    const store = new CatalogStore({
-      socket: () => sock as unknown as WebSocket,
-      scheduler: fakeScheduler(),
-    });
-    const seen: boolean[] = [];
-    store.subscribeConnection((up) => seen.push(up));
-    store.start();
-    // Nothing on subscribe — the daemon link's own probe sets the first state.
-    expect(seen).toEqual([]);
-    sock.open();
-    sock.drop();
-    expect(seen).toEqual([true, false]);
-  });
-});

web/src/events.ts

@@ -1,204 +0,0 @@
-import { eventsWsUrl, listSessions } from "./api.js";
-import type { CatalogEvent, Session, Uuid } from "./types.js";
-
-export interface CatalogState {
-  sessions: Map<Uuid, Session>;
-}
-
-export type CatalogListener = (state: CatalogState) => void;
-
-/** Opens the events socket. Injectable so the reducer and the backoff schedule
- * can be driven without a server. */
-export type SocketFactory = () => WebSocket;
-
-/** Schedules a reconnect attempt; returns a handle `clearTimer` understands. */
-export interface Scheduler {
-  setTimer(fn: () => void, ms: number): number;
-  clearTimer(handle: number): void;
-}
-
-const browserScheduler: Scheduler = {
-  setTimer: (fn, ms) => window.setTimeout(fn, ms),
-  clearTimer: (h) => window.clearTimeout(h),
-};
-
-/** Initial reconnect delay, doubling to `MAX_BACKOFF_MS`. */
-export const INITIAL_BACKOFF_MS = 500;
-export const MAX_BACKOFF_MS = 10_000;
-
-export interface CatalogStoreOptions {
-  socket?: SocketFactory;
-  scheduler?: Scheduler;
-  /** Full-state refetch used when the server reports it dropped frames. */
-  refetch?: () => Promise<Session[]>;
-}
-
-/** Called with `true` when the events socket opens, `false` when it drops.
- *  Drives the daemon link (daemonLink.ts) — the socket dying is the first sign
- *  the daemon went down or was upgraded under the page. */
-export type ConnectionListener = (up: boolean) => void;
-
-export class CatalogStore {
-  private state: CatalogState = { sessions: new Map() };
-  private listeners = new Set<CatalogListener>();
-  private connectionListeners = new Set<ConnectionListener>();
-  private ws: WebSocket | null = null;
-  private reconnectTimer: number | null = null;
-  private backoffMs = INITIAL_BACKOFF_MS;
-  private readonly socket: SocketFactory;
-  private readonly scheduler: Scheduler;
-  private readonly refetch: () => Promise<Session[]>;
-
-  constructor(opts: CatalogStoreOptions = {}) {
-    this.socket = opts.socket ?? (() => new WebSocket(eventsWsUrl()));
-    this.scheduler = opts.scheduler ?? browserScheduler;
-    this.refetch = opts.refetch ?? listSessions;
-  }
-
-  start(): void {
-    this.connect();
-  }
-
-  /** Replace a socket that may have gone stale while the browser was suspended. */
-  reconnect(): void {
-    if (this.reconnectTimer !== null) {
-      this.scheduler.clearTimer(this.reconnectTimer);
-      this.reconnectTimer = null;
-    }
-    if (this.ws) {
-      // A close event from the superseded socket must not schedule a second
-      // connection alongside the new one.
-      this.ws.onclose = null;
-      this.ws.onerror = null;
-      this.ws.close();
-      this.ws = null;
-    }
-    this.connect();
-  }
-
-  /** Current reconnect delay, for tests asserting the backoff schedule. */
-  backoff(): number {
-    return this.backoffMs;
-  }
-
-  stop(): void {
-    if (this.reconnectTimer !== null) {
-      this.scheduler.clearTimer(this.reconnectTimer);
-      this.reconnectTimer = null;
-    }
-    if (this.ws) {
-      this.ws.onclose = null;
-      this.ws.close();
-      this.ws = null;
-    }
-  }
-
-  /** Watch the socket's up/down transitions. Not called on subscribe: the
-   *  caller's own probe decides the starting state. */
-  subscribeConnection(listener: ConnectionListener): () => void {
-    this.connectionListeners.add(listener);
-    return () => this.connectionListeners.delete(listener);
-  }
-
-  subscribe(listener: CatalogListener): () => void {
-    this.listeners.add(listener);
-    listener(this.snapshot());
-    return () => this.listeners.delete(listener);
-  }
-
-  /** A copy, so a listener can diff it against the previous one. Returning the
-   * live object meant in-place mutation was invisible and every event forced a
-   * full re-render. */
-  snapshot(): CatalogState {
-    return { sessions: new Map(this.state.sessions) };
-  }
-
-  private connect(): void {
-    const ws = this.socket();
-    this.ws = ws;
-
-    ws.onmessage = (ev) => {
-      let event: CatalogEvent;
-      try {
-        event = JSON.parse(ev.data) as CatalogEvent;
-      } catch {
-        return;
-      }
-      this.apply(event);
-    };
-
-    ws.onopen = () => {
-      this.backoffMs = INITIAL_BACKOFF_MS;
-      this.emitConnection(true);
-    };
-
-    ws.onclose = () => {
-      this.ws = null;
-      this.emitConnection(false);
-      this.scheduleReconnect();
-    };
-
-    ws.onerror = () => {
-      try {
-        ws.close();
-      } catch {
-        // ignore
-      }
-    };
-  }
-
-  private scheduleReconnect(): void {
-    if (this.reconnectTimer !== null) return;
-    const delay = Math.min(this.backoffMs, MAX_BACKOFF_MS);
-    this.reconnectTimer = this.scheduler.setTimer(() => {
-      this.reconnectTimer = null;
-      this.backoffMs = Math.min(this.backoffMs * 2, MAX_BACKOFF_MS);
-      this.connect();
-    }, delay);
-  }
-
-  private apply(event: CatalogEvent): void {
-    switch (event.type) {
-      case "Snapshot":
-        this.state = {
-          sessions: new Map(event.sessions.map((s) => [s.id, s])),
-        };
-        break;
-      case "SessionAdded":
-        this.state.sessions.set(event.session.id, event.session);
-        break;
-      case "SessionRemoved":
-        this.state.sessions.delete(event.id);
-        break;
-      case "SessionUpdated":
-        this.state.sessions.set(event.session.id, event.session);
-        break;
-      case "Lagged":
-        // Re-derive from REST to avoid showing stale state.
-        void this.resync();
-        return;
-    }
-    this.emit();
-  }
-
-  private async resync(): Promise<void> {
-    try {
-      const sessions = await this.refetch();
-      this.state = {
-        sessions: new Map(sessions.map((s) => [s.id, s])),
-      };
-      this.emit();
-    } catch {
-      // surface in UI on next reconnect cycle; nothing else useful to do
-    }
-  }
-
-  private emitConnection(up: boolean): void {
-    for (const fn of this.connectionListeners) fn(up);
-  }
-
-  private emit(): void {
-    const snap = this.snapshot();
-    for (const fn of this.listeners) fn(snap);
-  }
-}

web/src/help.test.ts

@@ -1,127 +0,0 @@
-// @vitest-environment happy-dom
-import { afterEach, beforeEach, describe, expect, it } from "vitest";
-
-import { defineCommands, keyCaps, publishCommands, publishedCommands } from "./commands.js";
-import { closeHelp, groupedCommands, installHelpKeybind, isHelpOpen, openHelp } from "./help.js";
-
-beforeEach(() => {
-  installHelpKeybind();
-});
-
-afterEach(() => {
-  closeHelp();
-  document.body.replaceChildren();
-});
-
-function press(key: string, init: KeyboardEventInit = {}): void {
-  window.dispatchEvent(new KeyboardEvent("keydown", { key, bubbles: true, ...init }));
-}
-
-function rows(): string[] {
-  return [...document.querySelectorAll(".help-row")].map((r) =>
-    [...r.querySelectorAll("kbd")].map((k) => k.textContent).join(" "),
-  );
-}
-
-describe("help overlay", () => {
-  it("renders exactly the commands the registry has bound, grouped", () => {
-    openHelp();
-    const groups = groupedCommands();
-    expect([...document.querySelectorAll(".help-group-title")].map((h) => h.textContent)).toEqual(
-      groups.map((g) => g.title),
-    );
-    expect(rows()).toEqual(
-      groups.flatMap((g) => g.items.map((c) => keyCaps(c.keys[0]).join(" "))),
-    );
-    expect([...document.querySelectorAll(".help-desc")].map((d) => d.textContent)).toEqual(
-      groups.flatMap((g) => g.items.map((c) => c.label)),
-    );
-  });
-
-  it("names each row by its command id, so a row can't drift from its command", () => {
-    openHelp();
-    expect([...document.querySelectorAll<HTMLElement>(".help-row")].map((r) => r.dataset.commandId))
-      .toEqual(publishedCommands().map((c) => c.id));
-  });
-
-  // #159: the leader comes from the daemon, so the overlay must render the
-  // configured chord — a hardcoded `Ctrl A` is the visible half of the bug.
-  it("renders the configured leader's chord, not a hardcoded Ctrl A", () => {
-    const bound = defineCommands(
-      { "pane.literalCtrlK": () => {}, "pane.literalLeader": () => {} },
-      "ctrl-b",
-    );
-    publishCommands(bound);
-    try {
-      openHelp();
-      const keysOf = (id: string) =>
-        [
-          ...(document.querySelector(`.help-row[data-command-id="${id}"]`) as HTMLElement)
-            .querySelectorAll("kbd"),
-        ]
-          .map((k) => k.textContent)
-          .join(" ");
-      expect(keysOf("pane.literalCtrlK")).toBe("Ctrl B then Ctrl K");
-      expect(keysOf("pane.literalLeader")).toBe("Ctrl B then Ctrl B");
-    } finally {
-      // Leave the registry as the rest of the suite expects it.
-      publishCommands(
-        defineCommands({ "pane.literalCtrlK": () => {}, "pane.literalLeader": () => {} }),
-      );
-    }
-  });
-
-  it("opens on ? and closes on a second ?", () => {
-    press("?", { shiftKey: true });
-    expect(isHelpOpen()).toBe(true);
-    press("?", { shiftKey: true });
-    expect(isHelpOpen()).toBe(false);
-  });
-
-  it("closes on Escape, on the close button, and on a click outside the panel", () => {
-    openHelp();
-    press("Escape");
-    expect(isHelpOpen()).toBe(false);
-
-    openHelp();
-    (document.querySelector(".help-close") as HTMLButtonElement).click();
-    expect(isHelpOpen()).toBe(false);
-
-    openHelp();
-    (document.querySelector(".help-overlay") as HTMLElement).dispatchEvent(
-      new MouseEvent("click", { bubbles: true }),
-    );
-    expect(isHelpOpen()).toBe(false);
-  });
-
-  it("stays open for a click inside the panel", () => {
-    openHelp();
-    (document.querySelector(".help-panel") as HTMLElement).dispatchEvent(
-      new MouseEvent("click", { bubbles: true }),
-    );
-    expect(isHelpOpen()).toBe(true);
-  });
-
-  it("opening twice leaves one overlay", () => {
-    openHelp();
-    openHelp();
-    expect(document.querySelectorAll(".help-overlay")).toHaveLength(1);
-  });
-
-  it("ignores ? while typing and when a non-shift modifier is held", () => {
-    const input = document.createElement("input");
-    document.body.appendChild(input);
-    input.dispatchEvent(new KeyboardEvent("keydown", { key: "?", bubbles: true, shiftKey: true }));
-    expect(isHelpOpen()).toBe(false);
-
-    press("?", { ctrlKey: true });
-    expect(isHelpOpen()).toBe(false);
-  });
-
-  it("installing the keybind twice still toggles once", () => {
-    installHelpKeybind();
-    press("?", { shiftKey: true });
-    expect(isHelpOpen()).toBe(true);
-    expect(document.querySelectorAll(".help-overlay")).toHaveLength(1);
-  });
-});

web/src/help.ts

@@ -1,134 +0,0 @@
-/** Keyboard-shortcut overlay (`?`), the web counterpart of the TUI's help
- *  overlay. It renders the command registry (`commands.ts`) — the same list
- *  that dispatches the keys — so a binding can never be documented as one
- *  thing and do another. */
-
-import {
-  CommandSet,
-  defineCommands,
-  keyCaps,
-  publishedCommands,
-  type Command,
-} from "./commands.js";
-
-let open: { el: HTMLElement; dispose: () => void } | null = null;
-
-export function isHelpOpen(): boolean {
-  return open !== null;
-}
-
-export function closeHelp(): void {
-  open?.dispose();
-}
-
-export function toggleHelp(): void {
-  if (open) closeHelp();
-  else openHelp();
-}
-
-/** Mount the overlay. Opening while already open is a no-op re-render, so a
- *  stray second call can never stack two dialogs. */
-export function openHelp(): HTMLElement {
-  closeHelp();
-
-  const el = document.createElement("div");
-  el.className = "help-overlay";
-  el.setAttribute("role", "dialog");
-  el.setAttribute("aria-modal", "true");
-  el.setAttribute("aria-label", "Keyboard shortcuts");
-
-  const panel = document.createElement("div");
-  panel.className = "help-panel";
-
-  const head = document.createElement("header");
-  head.className = "help-head";
-  const title = document.createElement("h2");
-  title.className = "help-title";
-  title.textContent = "Keyboard shortcuts";
-  const close = document.createElement("button");
-  close.type = "button";
-  close.className = "help-close";
-  close.setAttribute("aria-label", "Close");
-  close.textContent = "✕";
-  close.addEventListener("click", closeHelp);
-  head.append(title, close);
-  panel.appendChild(head);
-
-  for (const group of groupedCommands()) {
-    const section = document.createElement("section");
-    section.className = "help-group";
-    const heading = document.createElement("h3");
-    heading.className = "help-group-title";
-    heading.textContent = group.title;
-    const list = document.createElement("dl");
-    list.className = "help-list";
-    for (const cmd of group.items) {
-      const row = document.createElement("div");
-      row.className = "help-row";
-      row.dataset.commandId = cmd.id;
-      const keys = document.createElement("dt");
-      keys.className = "help-keys";
-      for (const key of keyCaps(cmd.keys[0])) {
-        const cap = document.createElement("kbd");
-        cap.textContent = key;
-        keys.appendChild(cap);
-      }
-      const desc = document.createElement("dd");
-      desc.className = "help-desc";
-      desc.textContent = cmd.label;
-      row.append(keys, desc);
-      list.appendChild(row);
-    }
-    section.append(heading, list);
-    panel.appendChild(section);
-  }
-
-  // A press on the scrim closes; one inside the panel is left alone.
-  el.addEventListener("click", (ev) => {
-    if (!panel.contains(ev.target as Node)) closeHelp();
-  });
-  el.appendChild(panel);
-  document.body.appendChild(el);
-
-  const dispose = () => {
-    if (open?.el !== el) return;
-    open = null;
-    el.remove();
-  };
-  open = { el, dispose };
-  close.focus();
-  return el;
-}
-
-/** The registry's commands, in registry order, bucketed into the help
- *  overlay's sections. Groups appear in the order their first command does. */
-export function groupedCommands(): { title: string; items: Command[] }[] {
-  const groups: { title: string; items: Command[] }[] = [];
-  for (const cmd of publishedCommands()) {
-    let group = groups.find((g) => g.title === cmd.group);
-    if (!group) {
-      group = { title: cmd.group, items: [] };
-      groups.push(group);
-    }
-    group.items.push(cmd);
-  }
-  return groups;
-}
-
-// The overlay's own two commands. `help.close` is `overlay`-scoped: it is only
-// fed keys while the dialog is up.
-const helpKeys = new CommandSet(defineCommands({ "help.toggle": () => toggleHelp() }));
-const overlayKeys = new CommandSet(defineCommands({ "help.close": () => closeHelp() }));
-
-let installed = false;
-
-/** Global keybind: `?` toggles the overlay, Escape closes it. Idempotent, so a
- *  second call during a hot reload doesn't double-toggle. */
-export function installHelpKeybind(): void {
-  if (installed) return;
-  installed = true;
-  window.addEventListener("keydown", (e) => {
-    if (open && overlayKeys.handle(e)) return;
-    helpKeys.handle(e);
-  });
-}

web/src/hooks/useHashRouter.test.tsx

@@ -0,0 +1,82 @@
+// @vitest-environment happy-dom
+import { act, cleanup, render, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+import { useHashRouter, type Route, type UseHashRouterResult } from "./useHashRouter.js";
+
+let controls: UseHashRouterResult;
+
+function Probe() {
+  controls = useHashRouter();
+  return <div>{controls.route.kind === "attach" ? `attach:${controls.route.sessionId}` : "catalog"}</div>;
+}
+
+beforeEach(() => {
+  location.hash = "";
+});
+
+afterEach(cleanup);
+
+describe("useHashRouter", () => {
+  it("starts on catalog for an empty hash", () => {
+    const view = render(<Probe />);
+    expect(view.container.textContent).toBe("catalog");
+  });
+
+  it("resolves #/attach/:id to the attach route", () => {
+    location.hash = "#/attach/s1";
+    const view = render(<Probe />);
+    expect(view.container.textContent).toBe("attach:s1");
+  });
+
+  it("decodes an encoded session id", () => {
+    location.hash = `#/attach/${encodeURIComponent("weird id/x")}`;
+    const view = render(<Probe />);
+    expect(view.container.textContent).toBe("attach:weird id/x");
+  });
+
+  it("falls back to catalog for an unknown route", () => {
+    location.hash = "#/nonsense";
+    const view = render(<Probe />);
+    expect(view.container.textContent).toBe("catalog");
+  });
+
+  it("follows a hashchange fired outside the hook", async () => {
+    const view = render(<Probe />);
+    // happy-dom dispatches `hashchange` on a real timer, like a browser — not
+    // synchronously with the assignment.
+    location.hash = "#/attach/s9";
+    await waitFor(() => expect(view.container.textContent).toBe("attach:s9"));
+  });
+
+  it("navigate updates the hash and the route", async () => {
+    const view = render(<Probe />);
+    act(() => controls.navigate({ kind: "attach", sessionId: "s2" } satisfies Route));
+    expect(location.hash).toBe("#/attach/s2");
+    await waitFor(() => expect(view.container.textContent).toBe("attach:s2"));
+  });
+
+  it("navigate back to catalog sets the root hash", async () => {
+    location.hash = "#/attach/s1";
+    const view = render(<Probe />);
+    act(() => controls.navigate({ kind: "catalog" }));
+    expect(location.hash).toBe("#/");
+    await waitFor(() => expect(view.container.textContent).toBe("catalog"));
+  });
+
+  it("navigating to the already-current route still updates state", () => {
+    location.hash = "#/attach/s1";
+    const view = render(<Probe />);
+    act(() => controls.navigate({ kind: "attach", sessionId: "s1" } satisfies Route));
+    expect(view.container.textContent).toBe("attach:s1");
+  });
+
+  it("stops listening after unmount", async () => {
+    const view = render(<Probe />);
+    view.unmount();
+    location.hash = "#/attach/s3";
+    // No assertion beyond "doesn't throw" — a leaked listener would only ever
+    // surface as noise in a later test's act() warnings.
+    await new Promise((r) => setTimeout(r, 0));
+  });
+});

web/src/hooks/useHashRouter.ts

@@ -0,0 +1,47 @@
+// React port of main.ts's `parseRoute`/`dispatch` pair (issue #240). Same two
+// routes, same hash shape (`#/`, `#/attach/:id`) — kept so a deep link or a
+// bookmark from the vanilla shell still resolves.
+
+import { useCallback, useEffect, useState } from "react";
+
+export type Route = { kind: "catalog" } | { kind: "attach"; sessionId: string };
+
+function parseHash(hash: string): Route {
+  const raw = hash.replace(/^#/, "");
+  if (raw === "" || raw === "/") return { kind: "catalog" };
+  const m = raw.match(/^\/attach\/([^/?#]+)$/);
+  if (m) return { kind: "attach", sessionId: decodeURIComponent(m[1]) };
+  return { kind: "catalog" };
+}
+
+function routeToHash(route: Route): string {
+  return route.kind === "catalog" ? "#/" : `#/attach/${encodeURIComponent(route.sessionId)}`;
+}
+
+export interface UseHashRouterResult {
+  route: Route;
+  navigate(route: Route): void;
+}
+
+export function useHashRouter(): UseHashRouterResult {
+  const [route, setRoute] = useState<Route>(() => parseHash(location.hash));
+
+  useEffect(() => {
+    const onHashChange = () => setRoute(parseHash(location.hash));
+    window.addEventListener("hashchange", onHashChange);
+    return () => window.removeEventListener("hashchange", onHashChange);
+  }, []);
+
+  const navigate = useCallback((next: Route) => {
+    const hash = routeToHash(next);
+    // Setting an unchanged hash never fires `hashchange`, so the state update
+    // that would otherwise ride on that event has to happen here instead.
+    if (location.hash === hash) {
+      setRoute(next);
+    } else {
+      location.hash = hash;
+    }
+  }, []);
+
+  return { route, navigate };
+}

web/src/hooks/usePreview.test.tsx

@@ -0,0 +1,174 @@
+// @vitest-environment happy-dom
+import { act, cleanup, render } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { leaves } from "../layout.js";
+import { createLayoutStore, type LayoutStoreApi } from "../stores/layoutStore.js";
+import { usePreview, type UsePreviewResult } from "./usePreview.js";
+
+function fakeScheduler() {
+  const timers = new Map<number, () => void>();
+  let id = 0;
+  return {
+    scheduler: {
+      setTimer: (fn: () => void) => {
+        const h = ++id;
+        timers.set(h, fn);
+        return h;
+      },
+      clearTimer: (h: number) => {
+        timers.delete(h);
+      },
+    },
+    flush() {
+      for (const fn of [...timers.values()]) fn();
+      timers.clear();
+    },
+  };
+}
+
+/** Hand-driven clock + timer queue for the preview schedule's own throttle,
+ *  independent of the store's save-debounce scheduler above. */
+function fakeClock() {
+  let now = 1_000;
+  const timers = new Map<number, { at: number; fn: () => void }>();
+  let handle = 1;
+  return {
+    now: () => now,
+    setTimer: (fn: () => void, ms: number) => {
+      const h = handle++;
+      timers.set(h, { at: now + ms, fn });
+      return h;
+    },
+    clearTimer: (h: number) => {
+      timers.delete(h);
+    },
+    advance(ms: number) {
+      now += ms;
+      for (const [h, t] of [...timers]) {
+        if (t.at <= now) {
+          timers.delete(h);
+          act(() => t.fn());
+        }
+      }
+    },
+  };
+}
+
+function newStore(): LayoutStoreApi {
+  return createLayoutStore({ load: () => null, save: vi.fn(), scheduler: fakeScheduler().scheduler });
+}
+
+let controls: UsePreviewResult;
+
+function Probe({ store, clock }: { store: LayoutStoreApi; clock: ReturnType<typeof fakeClock> }) {
+  controls = usePreview({
+    store,
+    scheduleDeps: { now: clock.now, setTimer: clock.setTimer, clearTimer: clock.clearTimer },
+  });
+  return <div>{controls.previewedSessionId ?? "none"}</div>;
+}
+
+afterEach(cleanup);
+
+describe("usePreview", () => {
+  it("shows the first preview immediately — no settling delay", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => controls.preview("s9"));
+    expect(view.container.textContent).toBe("s9");
+    expect(leaves(store.getState().layout.tabs[1]?.root ?? null).map((l) => l.sessionId)).toEqual(["s9"]);
+  });
+
+  it("throttles a burst to one leading + one trailing pane swap", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => {
+      controls.preview("s1");
+      controls.preview("s8");
+      controls.preview("s9");
+    });
+    expect(view.container.textContent).toBe("s1");
+    clock.advance(120);
+    expect(view.container.textContent).toBe("s9");
+  });
+
+  it("touch never previews", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => controls.previewFromPointer("s9", "touch"));
+    expect(view.container.textContent).toBe("none");
+    expect(store.getState().preview).toBeNull();
+  });
+
+  it("previewFromPointer still previews for mouse/pen", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => controls.previewFromPointer("s9", "mouse"));
+    expect(view.container.textContent).toBe("s9");
+  });
+
+  it("commit cancels a pending trailing preview and opens for real", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => {
+      controls.preview("s1"); // leading edge: previews the already-open s1
+      controls.preview("s9"); // queued, gap not elapsed yet
+      controls.commit("s9");
+    });
+    expect(view.container.textContent).toBe("none"); // committed: no longer a preview
+    expect(leaves(store.getState().layout.tabs[0].root).map((l) => l.sessionId)).toEqual(["s9"]);
+
+    clock.advance(120);
+    // The cancelled trailing preview never fires.
+    expect(view.container.textContent).toBe("none");
+  });
+
+  it("end drops a preview immediately, bypassing the throttle", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => controls.preview("s9"));
+    expect(view.container.textContent).toBe("s9");
+
+    act(() => controls.end());
+    expect(view.container.textContent).toBe("none");
+    expect(store.getState().layout.tabs).toHaveLength(1);
+  });
+
+  it("cancels its pending trailing preview on unmount", () => {
+    const store = newStore();
+    store.getState().openSession("s1");
+    store.getState().addTab();
+    store.getState().openSession("s2"); // leading edge below will preview this, already on screen
+    const clock = fakeClock();
+    const view = render(<Probe store={store} clock={clock} />);
+
+    act(() => {
+      controls.preview("s2"); // leading edge: fires now
+      controls.preview("s9"); // queued trailing preview
+    });
+    expect(store.getState().preview?.sessionId).toBe("s2");
+    view.unmount();
+    clock.advance(120);
+    // The queued trailing preview must not fire after unmount.
+    expect(store.getState().preview?.sessionId).toBe("s2");
+  });
+});