feat: v1.26.0 — Bulk Select, Song Info, Favorite Button, Recently Played

### Added
- Favorite/Star button in player bar (requested by @halfkey)
- Bulk multi-select for album tracklist and playlist detail (add to playlist, remove from playlist)
- Song Info modal via right-click context menu (metadata: format, bitrate, sample rate, bit depth, channels, file size, path, replay gain)
- Recently Played section on Home page
- "Show activity in Now Playing" opt-in toggle in Settings → Behavior

### Fixed
- Queue cover art not updating on track change (useCachedUrl/CachedImage reset on cacheKey change)
- FullscreenPlayer background flickering (FsBg preloads image before layer transition)
- Playlist card delete confirmation visual (size expansion + pulse animation)
- Gruvbox Light Soft: back button and badge invisible against light background

### Changed
- buildStreamUrl: removed unused suffix parameter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/styles/theme.css

@@ -1053,6 +1053,20 @@
   --danger:        #9d0006;
 }
 
+/* ── Gruvbox Light Soft overrides ── */
+[data-theme='gruvbox-light-soft'] .album-detail-back {
+  color: #fbf1c7;
+}
+[data-theme='gruvbox-light-soft'] .album-detail-back:hover {
+  background: rgba(255, 255, 255, 0.15);
+  color: #ffffff;
+}
+
+[data-theme='gruvbox-light-soft'] .album-detail-badge {
+  background: var(--accent);
+  color: #fbf1c7;
+}
+
 /* ─── Lambda 17 — Half-Life / City 17 ─── */
 /* HEV orange + Combine Overwatch teal + City 17 concrete       */
 [data-theme='lambda-17'] {