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/layout.css

@@ -592,6 +592,11 @@
   height: 28px;
 }
 
+/* Star + Last.fm heart — visually separated from track title */
+.player-star-btn {
+  margin-left: var(--space-3);
+}
+
 .player-btn-primary {
   width: 46px;
   height: 46px;
@@ -617,8 +622,8 @@
   display: flex;
   align-items: center;
   gap: var(--space-2);
-  margin-left: 32px;
-  margin-right: 32px;
+  margin-left: 24px;
+  margin-right: 24px;
 }
 
 .player-waveform-wrap {