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/Models/Models.swift

@@ -13,6 +13,11 @@ struct Library: Codable, Identifiable, Hashable {
     let mediaType: String?
 }
 
+/// Wichtig für `ForEach`: Synthetische Podcast-Episoden-Items (z.B. aus der
+/// library-weiten Folgensuche) teilen sich denselben `id` (Podcast-Container-ID)
+/// und unterscheiden sich nur über `episodeId`. Default-`Identifiable` würde
+/// hier kollidieren. **Immer** `ForEach(items, id: \.syncKey)` benutzen wenn
+/// die Liste sowohl Container als auch Episoden-Items enthalten kann.
 struct LibraryItem: Codable, Identifiable, Hashable {
     let id: String
     let title: String
@@ -74,6 +79,10 @@ struct PlaybackProgress: Codable, Hashable {
     var duration: Double
     var isFinished: Bool
     var updatedAt: Date
+    /// Server-assigned UUID for this progress entry. Required to delete it —
+    /// Audiobookshelf's `DELETE /api/me/progress/:id` matches by this id, NOT
+    /// by libraryItemId. Optional so older persisted caches still decode.
+    var id: String?
 
     var syncKey: String {
         if let episodeId { return "\(itemId)|\(episodeId)" }