fix(room): increase streaming timeout from 60s to 120s

Give more buffer for heartbeat chunks to arrive during long tool
execution, reducing false "Stream timed out" errors.

src/contexts/room-context.tsx

@@ -498,7 +498,7 @@ export function RoomProvider({
         ),
       );
       streamingTimersRef.current.delete(msgId);
-    }, 60000);
+    }, 120000);
     streamingTimersRef.current.set(msgId, timer);
   }, []);