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/artist/ArtistPageView.slint

@@ -23,17 +23,19 @@ component CircleAction inherits Rectangle {
     width: root.diameter;
     height: root.diameter;
     border-radius: root.diameter / 2;
-    background: root.primary
-        ? (ta.has-hover ? Theme.accent-hover : Theme.accent)
-        : (ta.has-hover ? Theme.surface-hover : Theme.surface-elevated);
+    // Ghost circle — translucent fill with a faint ring, never a solid
+    // accent fill (mirrors the Tauri transport controls).
+    background: ta.has-hover ? Theme.surface-hover : transparent;
+    border-width: 1px;
+    border-color: ta.has-hover ? Theme.text-disabled : Theme.border-subtle;
 
     QbzIcon {
         source: root.icon;
-        width: 17px;
-        height: 17px;
+        width: root.primary ? 19px : 17px;
+        height: root.primary ? 19px : 17px;
         x: (parent.width - self.width) / 2;
         y: (parent.height - self.height) / 2;
-        tint: root.primary ? Theme.accent-text : Theme.text-secondary;
+        tint: ta.has-hover ? Theme.text-primary : Theme.text-secondary;
     }
 
     ta := TouchArea {
@@ -184,6 +186,7 @@ export component ArtistPageView inherits Rectangle {
             height: 340px;
             background: @linear-gradient(180deg,
                 ArtistState.header-color 0%,
+                ArtistState.header-color 16%,
                 transparent 100%);
         }