feat: stream list view and tasks (#279)

* first attempt at stream sidebar, tasks, and events

* fix folder from root

* cleanup folders and events, and condense changes

* cleanup and add toggle for sidebar

* cleanup

* fix nits

js/desktop/src/hooks/use-stream-playback.ts

@@ -98,12 +98,26 @@ interface UseStreamPlaybackResult {
   goToParticle: (particleId: string) => void;
 }
 
+interface UseStreamPlaybackOptions {
+  /**
+   * When false, newly arriving particles don't pull playback forward after
+   * it has ended (list mode browses; selection must stay put). Default true.
+   */
+  autoAdvanceOnNew?: boolean;
+}
+
 export function useStreamPlayback(
   streamParticle: Particle & { type: 'stream' },
   path: ParticlePath,
+  { autoAdvanceOnNew = true }: UseStreamPlaybackOptions = {},
 ): UseStreamPlaybackResult {
   const userId = useAuthStore((s) => s.user?.id);
   const [state, dispatch] = useReducer(playbackReducer, initialState);
+  // Read via ref so the onAdded subscription callback stays stable.
+  const autoAdvanceOnNewRef = useRef(autoAdvanceOnNew);
+  useEffect(() => {
+    autoAdvanceOnNewRef.current = autoAdvanceOnNew;
+  }, [autoAdvanceOnNew]);
   // Track the stream ID we've initialized for, to reset when navigating between streams
   const initializedForRef = useRef<string | null>(null);
   // Latest currentIndex for onParticleRemoved, which is passed into
@@ -115,6 +129,7 @@ export function useStreamPlayback(
 
   // --- Firestore change callbacks ---
   const onParticleAdded = useCallback((particle: Particle) => {
+    if (!autoAdvanceOnNewRef.current) return;
     dispatch({ type: 'PARTICLE_ADDED', particleId: particle.id });
   }, []);