fix: add nonisolated and @Sendable to TrackContextMenuConfig

Music/Models/TrackContextMenuConfig.swift

@@ -1,10 +1,8 @@
-import Foundation
-
-struct TrackContextMenuConfig {
+nonisolated struct TrackContextMenuConfig {
     let playlists: [Playlist]
     let lastUsedPlaylistName: String?
     let selectedPlaylist: Playlist?
-    let onAddToPlaylist: (Track, Playlist) -> Void
-    let onAddToLastPlaylist: ((Track) -> Void)?
-    let onRemoveFromPlaylist: ((Track) -> Void)?
+    let onAddToPlaylist: @Sendable (Track, Playlist) -> Void
+    let onAddToLastPlaylist: (@Sendable (Track) -> Void)?
+    let onRemoveFromPlaylist: (@Sendable (Track) -> Void)?
 }