Replace all `lock().unwrap()` calls on Mutex guards with explicit error messages using `.expect("... mutex poisoned")`. This improves robustness by providing clear diagnostics when a thread panics while holding the lock, preventing silent failures. Affected modules: events.rs (Renderer/MediaServer), all renderer backends, queue backend/implementation files. Also adds documentation to marker traits (HasQueue、 HasContinuousStream) and clarifies error handling in watcher loop with panic catching.
- Add `Hasqueue` trait and implement it for all renderers (Upnp, OpenHome, LinkPlay, ArylicTcp, Chromecast)
- Replace manual `QueueBackend` implementations with blanket impl for types implementing Hasqueue
(removes ~30+ duplicated methods across renderers)
- Fix BUG: `sync_queue` in UpnpRenderer now correctly propagates cancel_token instead of ignoring it
- Update version to 0.3.48 in Cargo.toml, lockfile and root file
- Add refactoring plan document (`refactoring_pmocontrol.md`) detailing remaining P1-P3 tasks
- Add `SyncCancelled` error variant for non-fatal cancellations
- Refactor queue sync to async via `MusicQueue::schedule_sync()`
- Extract browse+conversion into internal helper
- Update all `QueueBackend::sync_queue()` signatures to accept cancel token and on_ready callback
- Implement early-start logic (on pivot preservation or first insert)
- Add `QueueReadyToPlay` and ‘ QueueSyncCancelled➔ SSE events
- Replace blocking `refresh_attached_queue_for()` with non-blocking async dispatch in control_point.rs
- Bump version to v0.3.41
- Augmente le batch ReadList de 64 à 256 (-75% appels SOAP)
- Élimine les doubles appel à queue_snapshot() dans sync_queue()–50% appels SOAP en moins
- Introduit lcs_flags_optimized() pour élaguer préfixe/suffixes communs (LCS O(n) vs quadratique)
- Met en place un polling adaptatif : 500ms actif / 5s veille
- Factorise parse_duration() et invalidation de caches via méthodes utilitaires
