Home screen, library-wide search, splash with orbital particles, macOS download fix

- Add Netflix-style Home with recent audiobooks/podcasts, list/grid toggle shared with Library
- Add searchable libraries — audiobooks filter on title/author; podcasts also index and search episodes across the whole library
- Add unified context menu (download / progress remove) across Home, Library, and PodcastDetail
- Rework cover badges: listened checkmark top-right, download indicator bottom-right; hide progress bar when finished
- Add AirPlay picker in PlayerBar
- Replace splash with four-phase animation: orbital particles → attract → flash → fade; cross-platform iOS+macOS, runtime AppIcon lookup
- Fix macOS parallel downloads: align connection settings with iOS, raise timeoutIntervalForRequest to 300s
- Fix progress deletion using server-side progress UUID (DELETE /api/me/progress/:id)
- Bump CFBundleVersion to 8

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ABS Client/Audiobookshelf swift/Services/PlayerEngine.swift

@@ -112,6 +112,13 @@ final class PlayerEngine {
 
         let queue = AVQueuePlayer(items: trackPlayerItems)
         queue.rate = rate
+        // Enable AirPlay / Bluetooth / CarPlay routing. Without this, AVPlayer
+        // refuses to send audio to external devices even when the user picks
+        // them in Control Center / the route picker.
+        queue.allowsExternalPlayback = true
+        #if os(iOS)
+        queue.usesExternalPlaybackWhileExternalScreenIsActive = true
+        #endif
         self.player = queue
 
         let center = NotificationCenter.default