Tauri regression: the Svelte playbackService caught TrackUnavailable play
errors and called autoSkipToNext (bounded at 5 consecutive skips, issue
Tauri#467); the Slint port only logged and cleared the spinner, so the
queue cursor parked on the dead track and playback stopped.
play_audible's error arm now detects TERMINAL unavailability (substring
contract over the flattened ApiError Display: TrackUnavailable /
NonStreamable / NoQualityAvailable — transient errors keep NOT skipping,
the client already retries those), toasts, honors stop-after-this-song
on the failed track, and advances through the real machinery
(advance_to_playable + after_track_change, async recursion boxed).
Superseded fetches (user already picked another track) never skip.
Counter resets when audio actually starts. One new msgid x6 locales.
cc
vicrodh
41d93e5e5f