cleanup message retention code

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

@@ -4,8 +4,6 @@ import type { Particle } from "@/api/types";
 import { useLiveParticleChildren } from "@/hooks/use-particle";
 import { parseParticlePath, toFirestoreDocPath, type ParticlePath } from "@/lib/particle-path";
 import { updateStreamPlaybackMarker } from "@/lib/firestore-particles";
-import { where, Timestamp } from "firebase/firestore";
-import { useNetwork } from "@/hooks/use-networks";
 
 // --- Playback reducer (ID-based) ---
 
@@ -96,9 +94,6 @@ export function useStreamPlayback(
   path: ParticlePath,
 ): UseStreamPlaybackResult {
   const userId = useAuthStore((s) => s.user?.id);
-  const { networkId } = parseParticlePath(path);
-  const network = useNetwork(networkId);
-  const retentionHours = network?.message_retention_hours ?? 24;
   const [state, dispatch] = useReducer(playbackReducer, initialState);
   // Track the stream ID we've initialized for, to reset when navigating between streams
   const initializedForRef = useRef<string | null>(null);
@@ -118,15 +113,14 @@ export function useStreamPlayback(
     });
   });
 
-  const [recencyCutoff] = useState(() => {
-    const d = new Date();
-    d.setHours(d.getHours() - retentionHours);
-    return Timestamp.fromDate(d);
-  });
-
   const { children } = useLiveParticleChildren(
-    path, "created_at", "asc", undefined, onParticleAdded, onParticleRemoved,
-    where("created_at", ">=", recencyCutoff),
+    path,
+    {
+      orderByField: "created_at",
+      orderDirection: "asc",
+      onAdded: onParticleAdded,
+      onRemoved: onParticleRemoved
+    }
   );
 
   // Derive current index and particle from ID