Added justDisconnected guard to the participant sound loop. When
the user hangs up, isLiveKitConnected transitions to false — but
in a separate or same subscription tick, the participants list
also empties. Without the guard, SoundController plays user_leave
for every departed participant AND the disconnect sound simultaneously.
Now: if justDisconnected is true, the entire participant loop is
skipped. Only the disconnect sound plays.
Jannis Braun
1468b68199