The server-side queue persistence (Subsonic `savePlayQueue`) helpers
move into `src/store/queueSync.ts`:
- `syncQueueToServer` — 5-second debounce for rapid edits
- `flushQueueSyncToServer` — immediate flush (heartbeat, pause,
app close)
- `flushPlayQueuePosition` — exported wrapper that reads the live
playerStore queue + playback-progress current-time, skips radio
sessions
- `getLastQueueHeartbeatAt` — accessor the 15-second heartbeat
throttle in `handleAudioProgress` reads
The two timer/heartbeat mutables (`syncTimeout`, `lastQueueHeartbeatAt`)
are no longer reachable from outside the module. `flushPlayQueuePosition`
is re-exported from playerStore so TauriEventBridge + the persistence
characterization test keep their existing imports.
13 focused tests pin the debounce window, the 1000-id queue cap, the
cancel-on-immediate-flush behaviour, the no-op guards (empty queue /
null currentTrack / radio session), and the heartbeat-timestamp
contract.
playerStore 3238 → 3208 LOC.
Frank Stellmacher