feat: wire PlaylistViewModel into app and content view

Music/ContentView.swift

@@ -6,12 +6,18 @@ struct ContentView: View {
     var player: PlayerViewModel
     var scanner: ScannerService
     var audio: AudioService
+    var playlist: PlaylistViewModel
 
     var body: some View {
         VStack(spacing: 0) {
             SearchBarView(
-                trackCount: library.trackCount,
-                onSearch: { library.search($0) }
+                trackCount: playlist.selectedPlaylist != nil ? playlist.playlistTracks.count : library.trackCount,
+                onSearch: { text in
+                    library.search(text)
+                    if playlist.selectedPlaylist != nil {
+                        playlist.search(text)
+                    }
+                }
             )
 
             if scanner.isScanning {
@@ -26,15 +32,19 @@ struct ContentView: View {
             }
 
             TrackTableView(
-                tracks: library.tracks,
+                tracks: playlist.selectedPlaylist != nil ? playlist.playlistTracks : library.tracks,
                 playingTrackId: player.currentTrack?.id,
                 onSort: { column in
-                    library.sort(by: column)
+                    if playlist.selectedPlaylist == nil {
+                        library.sort(by: column)
+                    }
                 },
                 onDoubleClick: { track in
-                    player.setQueue(library.tracks)
+                    let trackList = playlist.selectedPlaylist != nil ? playlist.playlistTracks : library.tracks
+                    player.setQueue(trackList)
                     player.play(track)
-                }
+                },
+                onPlayPause: { audio.togglePlayPause() }
             )
 
             PlayerControlsView(

Music/MusicApp.swift

@@ -7,6 +7,7 @@ struct MusicApp: App {
     @State private var playerVM: PlayerViewModel?
     @State private var scannerService: ScannerService?
     @State private var audioService = AudioService()
+    @State private var playlistVM: PlaylistViewModel?
     @State private var initError: String?
 
     var body: some Scene {
@@ -15,12 +16,14 @@ struct MusicApp: App {
                 if let db = dbService,
                    let library = libraryVM,
                    let player = playerVM,
-                   let scanner = scannerService {
+                   let scanner = scannerService,
+                   let playlist = playlistVM {
                     ContentView(
                         library: library,
                         player: player,
                         scanner: scanner,
-                        audio: audioService
+                        audio: audioService,
+                        playlist: playlist
                     )
                 } else if let error = initError {
                     Text("Failed to initialize database: \(error)")
@@ -54,17 +57,22 @@ struct MusicApp: App {
             let scanner = ScannerService(db: db)
             let library = LibraryViewModel(db: db)
             let player = PlayerViewModel(audio: audioService, db: db)
+            let playlist = PlaylistViewModel(db: db)
 
             self.dbService = db
             self.scannerService = scanner
             self.libraryVM = library
             self.playerVM = player
+            self.playlistVM = playlist
 
-            if let savedFolder = UserDefaults.standard.string(forKey: "musicFolderPath"),
-               let url = URL(string: savedFolder) {
+            if let url = resolveBookmark() {
                 Task {
                     await scanner.rescan(url)
                 }
+            } else {
+                DispatchQueue.main.async {
+                    pickFolder()
+                }
             }
         } catch {
             initError = error.localizedDescription
@@ -80,7 +88,7 @@ struct MusicApp: App {
 
         guard panel.runModal() == .OK, let url = panel.url else { return }
 
-        UserDefaults.standard.set(url.absoluteString, forKey: "musicFolderPath")
+        saveBookmark(for: url)
 
         if let scanner = scannerService {
             Task {
@@ -88,4 +96,39 @@ struct MusicApp: App {
             }
         }
     }
+
+    private func saveBookmark(for url: URL) {
+        do {
+            let data = try url.bookmarkData(
+                options: .withSecurityScope,
+                includingResourceValuesForKeys: nil,
+                relativeTo: nil
+            )
+            UserDefaults.standard.set(data, forKey: "musicFolderBookmark")
+        } catch {
+            print("Failed to save bookmark: \(error)")
+        }
+    }
+
+    private func resolveBookmark() -> URL? {
+        guard let data = UserDefaults.standard.data(forKey: "musicFolderBookmark") else {
+            return nil
+        }
+        do {
+            var isStale = false
+            let url = try URL(
+                resolvingBookmarkData: data,
+                options: .withSecurityScope,
+                relativeTo: nil,
+                bookmarkDataIsStale: &isStale
+            )
+            guard url.startAccessingSecurityScopedResource() else { return nil }
+            if isStale {
+                saveBookmark(for: url)
+            }
+            return url
+        } catch {
+            return nil
+        }
+    }
 }