fix: stable view identity in TrackContextMenuModifier, remove @Sendable from config closures

Music/Models/TrackContextMenuConfig.swift

@@ -2,7 +2,7 @@ nonisolated struct TrackContextMenuConfig {
     let playlists: [Playlist]
     let lastUsedPlaylistName: String?
     let selectedPlaylist: Playlist?
-    let onAddToPlaylist: @Sendable (Track, Playlist) -> Void
-    let onAddToLastPlaylist: (@Sendable (Track) -> Void)?
-    let onRemoveFromPlaylist: (@Sendable (Track) -> Void)?
+    let onAddToPlaylist: (Track, Playlist) -> Void
+    let onAddToLastPlaylist: ((Track) -> Void)?
+    let onRemoveFromPlaylist: ((Track) -> Void)?
 }

Music/Views/TrackContextMenuModifier.swift

@@ -7,8 +7,8 @@ struct TrackContextMenuModifier: ViewModifier {
     let config: TrackContextMenuConfig?
 
     func body(content: Content) -> some View {
-        if let track, let config {
         content.contextMenu {
+            if let track, let config {
                 if let lastPlaylistName = config.lastUsedPlaylistName,
                    let onAddToLastPlaylist = config.onAddToLastPlaylist {
                     Button("Add to \(lastPlaylistName)") {
@@ -35,8 +35,6 @@ struct TrackContextMenuModifier: ViewModifier {
                     }
                 }
             }
-        } else {
-            content
         }
     }
 }