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/styles/layout/index.css

@@ -9,6 +9,7 @@
 @import './main-content.css';
 @import './offline-banner.css';
 @import './offline-storage-full-banner.css';
+@import './lossless-mode-banner.css';
 @import './player-bar.css';
 @import './eq-popup.css';
 @import './queue-panel.css';