Root cause: MainActivity had no onNewIntent override. When the app was
backgrounded and a notification was tapped, Android brought the existing
task to the foreground and delivered the intent via onNewIntent — but
since it wasn't overridden, the session ID from the notification was
silently dropped and the user saw the last-active session.
Fix:
1. Changed notificationSessionId from a local val to a Compose
mutableStateOf so it's observable across recompositions.
2. Added onNewIntent override that reads the session ID from the
incoming intent and updates the observable state.
3. Added FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP to the
notification PendingIntent for reliable task management.
M57
d2e59b2741