Fix 5 TestFlight crash types from builds 250-254

- Fix BGTaskScheduler assertion crash on Mac Catalyst by guarding all
  iOS background task APIs with isMacCatalystApp check
- Fix iPad popover crash in UIPopoverPresentationController by adding
  .presentationCompactAdaptation(.sheet) to all 27 confirmationDialogs
- Fix SwiftData assertion crash when accessing deleted Bookmark model
  properties during SwiftUI hit testing in BookmarkRowView
- Fix UICollectionView invalid item count crash on queue swipe-to-delete
  by using ID-based removal with withAnimation instead of stale index
- Fix Range crash in storyboard download when storyboardCount is zero

Yattee/Views/Settings/ImportPlaylistsView.swift

@@ -77,6 +77,7 @@ struct ImportPlaylistsView: View {
                     Task { await addAllPlaylists() }
                 }
             }
+            .presentationCompactAdaptation(.sheet)
             .confirmationDialog(
                 String(localized: "import.playlists.mergeWarning.title"),
                 isPresented: $showMergeWarning,
@@ -97,6 +98,7 @@ struct ImportPlaylistsView: View {
                     Text(String(localized: "import.playlists.mergeWarning.message \(playlist.title)"))
                 }
             }
+            .presentationCompactAdaptation(.sheet)
             .task {
                 await loadPlaylists()
             }