feat(slint): album view detail parity

Bring the album view closer to 1:1 with the Tauri original.

- Track list: favorite and offline-cache columns, and the context-menu
  button now always shows in the muted column color (it brightens on
  hover) instead of being hidden until hover
- Toolbar above the track list: a QualityBadgeFull port of the Tauri
  QualityBadgeStatic (icon + tier + exact bit-depth/sample-rate), plus
  a track search box
- Editorial album description, truncated, with a Read more link that
  opens the full text in a modal
- Label/awards sidebar: drop the resting card background; awards use
  the Tauri laurels SVG
- Control buttons on both album and artist views are ghost circles
  (translucent fill, faint ring) instead of solid fills

cc

crates/qbz-slint/ui/assets/mp3.svg

@@ -0,0 +1,2 @@
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