feat: add SyncAll periodic sync pipeline and wire Navidrome client into App

docs/plans/2026-07-19-notifier-webui-sync.md

@@ -95,10 +95,10 @@ name collisions.)
 - [x] run tests - must pass before task 3
 
 ### Task 3: Periodic sync pipeline
-- [ ] add `SyncAll(ctx, ndClient, mbClient, db, ttl)` orchestrator: for each monitored artist → ensure MBID (resolve + persist if missing) → `musicbrainz.SyncArtistDiscography` → `navidrome.SyncAlbums`
-- [ ] wire `navidrome.NewClient` into `App`; add `ndClient` field
-- [ ] write tests for `SyncAll` with stubbed clients + `:memory:` DB (new artist gets MBID, existing MBID reused, unmonitored skipped)
-- [ ] run tests - must pass before task 4
+- [x] add `SyncAll(ctx, ndClient, mbClient, db, ttl)` orchestrator: for each monitored artist → ensure MBID (resolve + persist if missing) → `musicbrainz.SyncArtistDiscography` → `navidrome.SyncAlbums`
+- [x] wire `navidrome.NewClient` into `App`; add `ndClient` field
+- [x] write tests for `SyncAll` with stubbed clients + `:memory:` DB (new artist gets MBID, existing MBID reused, unmonitored skipped)
+- [x] run tests - must pass before task 4
 
 ### Task 4: Main loop wiring (sync → scan)
 - [ ] replace compute-only `run()` with: one immediate sync+scan, then a ticker-driven periodic sync+scan goroutine; keep graceful shutdown via ctx