A cpal stream error was only kept and logged on stop, and the player kept
`streaming` true, so a device that died mid-play froze the voice and video.
AudioOut gains `failure()` (CpalOut reports DeviceNotAvailable), and
Player::tick also treats a stream with no callbacks for a second while a
voice plays as stalled. Either way the stream is stopped, voices continue on
the wall clock, and the next play retries the device; after three failures
the player gives up on the device and plays silently.
Co-authored-by: Cursor <cursoragent@cursor.com>