feat(library): local lossless index, filters, and conserve dedicated page (#871)

* feat(library): local lossless index, filters, and conserve dedicated page

Add SQLite-backed lossless album browse and advanced-search filtering,
wire All Albums and artist/album lossless drill-down mode, and hide the
standalone /lossless-albums nav entry from sidebar visibility settings
(conserved route, default off).

* docs(release): note lossless local index in CHANGELOG and credits (PR #871)

src/utils/library/advancedSearchLocal.test.ts

@@ -12,6 +12,7 @@ const opts = (over: Partial<Parameters<typeof runLocalAdvancedSearch>[1]> = {})
   bpmFrom: '',
   bpmTo: '',
   moodGroup: '',
+  losslessOnly: false,
   resultType: 'all' as const,
   ...over,
 });
@@ -61,6 +62,25 @@ describe('runLocalAdvancedSearch', () => {
     expect(captured).toMatchObject({ request: { libraryScope: 'lib7' } });
   });
 
+  it('passes lossless is_true filter to library_advanced_search', async () => {
+    ready();
+    let captured: unknown;
+    onInvoke('library_advanced_search', (args) => {
+      captured = args;
+      return {
+        artists: [],
+        albums: [],
+        tracks: [],
+        totals: { artists: 0, albums: 0, tracks: 0 },
+        source: 'local',
+      };
+    });
+    await runLocalAdvancedSearch('s1', opts({ losslessOnly: true }), 100);
+    expect(captured).toMatchObject({
+      request: { filters: [{ field: 'lossless', op: 'is_true' }] },
+    });
+  });
+
   it('passes bpm between filter to library_advanced_search', async () => {
     ready();
     let captured: unknown;