The Flutter client previously reported NO plays — mobile listening
never reached play_events, so history, recommendation scoring,
ListenBrainz scrobbles, and #415 rotation all missed mobile entirely.
Operator chose to close that gap properly as part of Stage 3.
New:
- EventsApi (api/endpoints/events.dart): play_started/ended/skipped.
- PlayEventsReporter (player/play_events_reporter.dart): state
machine over (track id, playing) mirroring the web dispatcher.
Persists an opaque client_id in secure storage. Deliberate
divergence from web: a track change inside a queue is classified
ended-vs-skipped by whether the prior track reached ~its duration
(3s tolerance), instead of web's blanket "track change = skip"
which would mark every naturally-finished in-queue track a skip
and dilute recommendation skip-ratios — the exact failure mode
that motivated doing this properly. Fail-safe: no-ops when there's
no audio handler (tests / no-audio env). App-lifecycle paused/
detached closes an open row as a best-effort skip (web pagehide
parity). Wired in app.dart postFrame.
- PlaylistsApi.systemShuffle(variant): GET the rotation-aware order.
Wiring:
- audio_handler: _queueSource carried through setQueueFromTracks
(source param); preserved across internal skipToQueueItem rebuild.
- player_provider.playTracks: source param → setQueueFromTracks.
- PlaylistCard: system playlists fetch systemShuffle and play as-is
tagged with source (no client shuffle — server already ordered).
- playlist_detail_screen: header Play + per-track tap tag source for
system playlists so rotation advances from any entry point.
Known/flagged separately: the web dispatcher likely has the same
false-skip-on-advance issue; not fixed here to keep #415 scoped and
clients' wire behavior comparable.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
