fix(maestro): spawn similar preselects the cloned project

Spawn similar dropped the session's cwd into the free-text directory hatch,
so the project picker showed nothing selected. For a worktree session that
cwd was the daemon-made checkout, and the worktree toggle defaulted on, so
the clone asked for a worktree of a worktree.

It now seeds the picker: the cloned project's box selected, the same
worktree decision, base repo plus '+ new' when the source had a worktree.
A seeded path that matches no project falls back to the raw input showing
that path instead of an empty picker.

web/src/main.ts

@@ -15,6 +15,7 @@ import {
   resolveFastForward,
 } from "./fastForward.js";
 import { FALLBACK_PRESETS } from "./spawnForm.js";
+import { spawnSimilarSeed } from "./spawnSimilar.js";
 import { mountHud, type Hud } from "./hud.js";
 import { emptyLayout, type Layout, openSessions } from "./layout.js";
 import { createMultiView, type MultiView } from "./multiview.js";
@@ -265,8 +266,8 @@ function showMultiView(): void {
 }
 
 // Spawn affordances (#62): the header button, the sidebar's empty state, and
-// `?mock&spawn` all open a draft pane; "Spawn similar" seeds one with the
-// cloned session's dir + command.
+// `?mock&spawn` all open a draft pane; "Spawn similar" seeds one from the
+// cloned session (see spawnSimilar.ts).
 function requestOpenSpawn(): void {
   showMultiView();
   // A new tab, not a split of the pane you were reading (#100). "Spawn
@@ -279,7 +280,7 @@ document.addEventListener(OPEN_SPAWN_EVENT, () => requestOpenSpawn());
 document.addEventListener("catalog-spawn-similar", (ev) => {
   const s = (ev as CustomEvent<Session>).detail;
   showMultiView();
-  mv.openDraft({ cwd: s.cwd, command: s.command });
+  mv.openDraft(spawnSimilarSeed(s));
 });
 
 // Fast-forward spawn (#67): the draft pane's keystroke neighbour spawns