LocalTrackPublished registers a one-shot onended on the camera track's
MediaStreamTrack. The handler:
- skips when consumeIntentionalCameraOff() flag is set (user-initiated)
- re-probes getUserMedia to distinguish NotAllowedError (permission
revoked) from NotFoundError (disconnected) from other errors
- tears down camera state via the unified path
Also reset _intentionalCameraOff in voiceActions if setCameraEnabled(false)
rejects, so a failed disable doesn't poison the next genuine unplug.
Jannis Braun
786823946a