batch4: chats-in-sessions, force-send, /compact, right-rail file browser

Session 1:N Chat data model with backfill. Workspace switches to client-side
multi-tab pane management. Right-rail file browser with float-over viewer and
click-drag line selection replaces FileBrowserPane. Adds /compact streaming
summarizer (respects compact markers in context builder), force-send (cancels
in-flight, persists partial as 'cancelled', awaits cancellation completion via
deferred Promise + 5s timeout), message queue, stop generation, chat
auto-rename, session archive/unarchive with Closed Sessions section on repo
landing page. CHECK constraints on sessions.status, messages.role,
messages.status with KEEP IN SYNC comments tying to MESSAGE_ROLES /
MESSAGE_STATUSES const arrays. Deletes dead pane routes/hook and the
api.panes.* client block.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/hooks/useSidebar.ts

@@ -140,26 +140,50 @@ function applyEvent(prev: SidebarResponse, event: import('./sessionEvents').Sess
     case 'open_file_in_browser':
       // Consumed by Workspace (T7); no sidebar state change needed.
       return prev;
+    case 'attach_chat_file':
+      return prev;
+    case 'session_archived': {
+      let changed = false;
+      const projects = prev.projects.map((p) => {
+        if (p.id !== event.project_id) return p;
+        const recent = p.recent_sessions.filter((s) => s.id !== event.session_id);
+        if (recent.length === p.recent_sessions.length) return p;
+        changed = true;
+        return {
+          ...p,
+          recent_sessions: recent,
+          total_sessions: Math.max(0, p.total_sessions - 1),
+        };
+      });
+      return changed ? { ...prev, projects } : prev;
+    }
+    case 'chat_created':
+    case 'chat_updated':
+    case 'chat_closed':
+      return prev;
   }
 }
 
 // One bus subscription for the lifetime of the module. Events arriving
 // before the initial fetch resolves are dropped; the eventual fetch
 // result is the source of truth.
-sessionEvents.subscribe((event) => {
-  // session_loaded updates activeSessionProjectId regardless of whether
-  // sharedData is populated yet — notify so subscribers can re-read.
-  if (event.type === 'session_loaded') {
-    activeSession = { session_id: event.session_id, project_id: event.project_id };
+// Guard prevents duplicate listeners during Vite HMR reloads.
+const G = globalThis as Record<string, unknown>;
+if (!G.__boocode_sidebar_subscribed) {
+  G.__boocode_sidebar_subscribed = true;
+  sessionEvents.subscribe((event) => {
+    if (event.type === 'session_loaded') {
+      activeSession = { session_id: event.session_id, project_id: event.project_id };
+      notify();
+      return;
+    }
+    if (!sharedData) return;
+    const next = applyEvent(sharedData, event);
+    if (next === sharedData) return;
+    sharedData = next;
     notify();
-    return;
-  }
-  if (!sharedData) return;
-  const next = applyEvent(sharedData, event);
-  if (next === sharedData) return;
-  sharedData = next;
-  notify();
-});
+  });
+}
 
 interface Snapshot {
   data: SidebarResponse | null;