refreshRoom method

@override Future<void> refreshRoom(String roomId)

Like refresh but scoped to a single room.

Wire to a per-chat pull-to-refresh in RealtimeMode.manual; in polling it skips the next room-list diff and pulls messages for roomId only. Streaming modes: no-op (same caveat as refresh).

Implementation

@override
Future<void> refreshRoom(String roomId) async {}