fix(app): bridge auto-reconnect so daemon restart no longer bricks the GUI

The Tauri bridge connected to the daemon once at startup and held a single
stream with no recovery: when the daemon exited (Restart/Stop, crash, or an
update), the reader emitted spacesh:disconnected and died, and every later
request went through the dead writer forever — the GUI was permanently stuck
(settings frozen, offline). Since the bridge is Rust-side state that survives
a webview reload, even Cmd+R didn't recover it.

- bridge.rs: requests now reconnect-and-retry on failure with a single-flight
  guard (generation counter) so concurrent failures collapse into one
  reconnect and never open duplicate connections; a 5s reply timeout catches
  silently-dropped connections. ensure_daemon respawns the daemon if it
  exited. On success the bridge emits spacesh:reconnected.
- App.tsx: on spacesh:reconnected, bump a connection epoch that keys
  LayoutEngine, remounting terminals so they re-attach (snapshot + live stream)
  to the restarted daemon; also reload health/config/status.
- Settings: drop the Stop button — with lazy daemon spawn any GUI request
  resurrects the daemon, so an in-GUI "stop" is contradictory. Restart now
  works end to end (shutdown → reconnect respawns → panels re-attach).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/App.tsx

@@ -37,6 +37,9 @@ export function App() {
   const [sidebarOpen, setSidebarOpen] = useState(() => loadFlag("spacesh.sidebarOpen", true));
   const [health, setHealth] = useState<DaemonHealth | null>(null);
   const [config, setConfigState] = useState<ConfigView | null>(null);
+  // Bumped when the daemon connection is re-established; used to remount the
+  // layout so terminals re-attach (snapshot + live stream) to the restarted daemon.
+  const [connEpoch, setConnEpoch] = useState(0);
   const [connected, setConnected] = useState(false);
   const [focusedId, setFocusedId] = useState<string | null>(null);
   const [searchSurfaceId, setSearchSurfaceId] = useState<string | null>(null);
@@ -112,7 +115,15 @@ export function App() {
       void loadHealth();
       void getConfig().then((c) => { setConfigState(c); applyTheme(c.theme, c.accent); }).catch(() => {});
     });
-    return () => { void unlisten.then((f) => f()); void reconnect.then((f) => f()); };
+    const reconnected = onDaemonRawEvent("spacesh:reconnected", () => {
+      setConnected(true);
+      setConnEpoch((n) => n + 1); // remount layout → terminals re-attach to the new daemon
+      void refresh();
+      void seedEvents();
+      void loadHealth();
+      void getConfig().then((c) => { setConfigState(c); applyTheme(c.theme, c.accent); }).catch(() => {});
+    });
+    return () => { void unlisten.then((f) => f()); void reconnect.then((f) => f()); void reconnected.then((f) => f()); };
   }, [refresh, seedEvents, loadHealth]);
 
   useEffect(() => {
@@ -158,7 +169,7 @@ export function App() {
           )}
           <div style={{ flex: 1, minHeight: 0, position: "relative" }}>
             {active
-              ? <LayoutEngine workspaceId={active.id} layout={active.layout} running={running} states={states} surfaces={active.surfaces} focusedId={effectiveFocus} onFocus={setFocusedId} zoomed={active.zoomed} searchSurfaceId={searchSurfaceId} searchNonce={searchNonce} onCloseSearch={() => setSearchSurfaceId(null)} font={termFont} palette={termPalette} />
+              ? <LayoutEngine key={connEpoch} workspaceId={active.id} layout={active.layout} running={running} states={states} surfaces={active.surfaces} focusedId={effectiveFocus} onFocus={setFocusedId} zoomed={active.zoomed} searchSurfaceId={searchSurfaceId} searchNonce={searchNonce} onCloseSearch={() => setSearchSurfaceId(null)} font={termFont} palette={termPalette} />
               : <div style={{ color: COLORS.textMuted, padding: 24 }}>No workspace — create one to begin.</div>}
           </div>
         </div>