core: subscribe to rooms on player actor startup

crates/lavina-core/src/player.rs

@@ -414,6 +414,7 @@ impl Player {
             } else {
                 let room = self.services.rooms.get_room(&self.services, &room_id).await;
                 if let Some(room) = room {
+                    room.subscribe(&self.player_id, self.handle.clone()).await;
                     self.my_rooms.insert(room_id, RoomRef::Local(room));
                 } else {
                     tracing::error!("Room #{room_id:?} not found");