zarzet cfc8e699f3 perf: optimize native worker snapshot writes with delta mode ...

Replace full-queue snapshot writes on every progress tick with a
lightweight delta mode that only includes the active item.

- Progress tick (1s loop) now writes item_delta with only the
  active item instead of serializing the entire queue
- Full compact_items snapshots are reserved for important events:
  start, pause/resume/cancel, item boundaries, finish, and
  service stop/destroy
- Compact items omit large static fields (item_json, track_name,
  artist_name) that Dart already has from queue restore
- Snapshot always carries item_ids for adoption correlation
- Dart-side _applyAndroidNativeWorkerSnapshot handles item_delta
  as a single-item fallback when items array is absent
- Dart-side _tryAdoptAndroidNativeWorkerSnapshot reads item_ids
  as fallback when items is not present
- Add deferred SAF publish: native worker writes to cache, runs
  all finalization locally, then publishes once to SAF at the end
- Forward defer_saf_publish through DownloadRequestPayload

2026-05-05 03:17:38 +07:00

..

models_and_utils_test.dart

perf: optimize native worker snapshot writes with delta mode

2026-05-05 03:17:38 +07:00