feat(13-02): add library filter dropdown and wire all views to respect active filter

- Add selectedLibraryId state + ByLibrary conditional calls to library-store
- Add library filter pass-through methods to library-controller
- Create library-filter dropdown component in top bar
- Wire genre-details, cover-grid, artists-view, genres-view to use ByLibrary queries
- Update album-selection helper to respect library filter
- Regenerate Wails bindings for new ByLibrary methods
- Search remains client-side (automatically filtered by loaded data)
- Playlists remain unfiltered (use separate playlist store)

.planning/ROADMAP.md

@@ -108,7 +108,7 @@ Plans:
   3. Search results respect the active library filter — searching with a library selected returns only matches from that library; with "All Libraries" selected, searches everything
   4. Playlists can contain tracks from multiple libraries — adding tracks from different libraries to the same playlist works naturally
   5. When a library is removed, its tracks in playlists become phantom entries — visually distinguished (greyed out / icon) with preserved title, artist, album metadata instead of disappearing
-**Plans:** 2 plans
+**Plans:** 1/2 plans executed
 Plans:
 - [ ] 13-01-PLAN.md — Backend library-filtered sqlc queries + Go methods + FTS search
 - [ ] 13-02-PLAN.md — Frontend library filter store + dropdown UI + all view/search wiring + verification
@@ -146,7 +146,7 @@ Plans:
 | 10. Schema & Migration | 2/2 | Complete    | 2026-03-09 | - |
 | 11. Per-Library Scan Pipeline | 3/3 | Complete    | 2026-03-09 | - |
 | 12. Library CRUD & Data Integrity | v1.1 | Complete    | 2026-03-15 | 2026-03-15 |
-| 13. Library Views & Phantom Tracks | v1.1 | 0/2 | Planned | - |
+| 13. Library Views & Phantom Tracks | 1/2 | In Progress|  | - |
 | 14. Performance Optimization | 4/4 | Complete    | 2026-03-15 | - |
 
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