RoomEvent.Disconnected handler set participants=[] and
isLiveKitConnected=false in separate setState calls. SoundController
subscription fired between them — saw empty participants while still
"connected" → played user_leave, then saw disconnected → played
disconnect. Both sounds played simultaneously.
Batching into one setState ensures SoundController sees the final
state atomically: participants gone AND disconnected in one update.
Jannis Braun
22aa1e3f66