fix(maestro): re-focus a sidebar session already open in a split

Sidebar rows only navigated via location.hash + hashchange. Moving
pane focus by split, drag, or direct pane click never touched the
hash, so a later click back onto a session whose row href matched the
stale hash fired no hashchange and was silently ignored — the pane
had to be clicked directly to regain focus.

Row clicks now also dispatch a session-select event handled the same
way as a hash deep-link, independent of whether the hash text changes.

web/src/catalog.ts

@@ -44,6 +44,14 @@ export const FOCUS_PANE_EVENT = "catalog-focus-pane";
  *  ("Spawn similar"). Detail is the session being cloned. */
 export const SPAWN_SIMILAR_EVENT = "catalog-spawn-similar";
 
+/** 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 —
@@ -194,6 +202,9 @@ function renderNode(node: TreeNode, depth: number): HTMLElement {
     ev.stopPropagation();
     void requestKill(s, name);
   });
+  row.addEventListener("click", () => {
+    document.dispatchEvent(new CustomEvent(SESSION_SELECT_EVENT, { detail: s.id }));
+  });
   row.addEventListener("contextmenu", (ev) => {
     ev.preventDefault();
     ev.stopPropagation();

web/src/main.ts

@@ -29,7 +29,12 @@ import { mountHud, type Hud } from "./hud.js";
 import { emptyLayout, type Layout, openSessions } from "./layout.js";
 import { createMultiView, type MultiView } from "./multiview.js";
 import { loadLayout, saveLayout } from "./persistence.js";
-import { FOCUS_PANE_EVENT, OPEN_SPAWN_EVENT, SPAWN_SIMILAR_EVENT } from "./catalog.js";
+import {
+  FOCUS_PANE_EVENT,
+  OPEN_SPAWN_EVENT,
+  SESSION_SELECT_EVENT,
+  SPAWN_SIMILAR_EVENT,
+} from "./catalog.js";
 import { initTheme } from "./theme.js";
 import { sessionName, type Project, type Session, type SpawnPreset } from "./types.js";
 import { installViewportSizing } from "./viewport.js";
@@ -355,6 +360,20 @@ window.addEventListener("keydown", (e) => {
 // Escape in the session list hands the keyboard back to the pane.
 document.addEventListener(FOCUS_PANE_EVENT, () => pool.focusTerminal());
 
+/** Open/focus a session and reflect it in the shell chrome. 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 session's row silently ignored. */
+function focusSession(sessionId: string): void {
+  showMultiView();
+  mv.openSession(sessionId);
+  updateShellRoute();
+}
+
+document.addEventListener(SESSION_SELECT_EVENT, (e) => {
+  focusSession((e as CustomEvent<string>).detail);
+});
+
 type Route =
   | { kind: "catalog" }
   | { kind: "attach"; sessionId: string }
@@ -373,9 +392,7 @@ function dispatch(): void {
   switch (route.kind) {
     case "attach":
       // Deep-link: open/focus the session, then show the layout.
-      showMultiView();
-      mv.openSession(route.sessionId);
-      updateShellRoute();
+      focusSession(route.sessionId);
       return;
     case "not-found":
       shellEl.dataset.route = "notfound";