Enhance download notifications and settings; add support for live activities

- Updated notification body to use proper German quotation marks for download failure alerts.
- Refactored audio interruption handling in PlayerEngine to utilize MainActor.assumeIsolated for better performance.
- Introduced nonisolated properties for support and downloads directories in ProgressSyncManager.
- Improved FullHistoryView and MainView with additional toolbar items and alerts for download failures.
- Added new toggles in SettingsView for parallel downloads and mobile data usage.
- Created new color assets for the DownloadWidgetExtension and updated widget appearance.
- Implemented Info.plist for DownloadWidgetExtension to support widget functionality.
- Enabled live activities support in iOS Info.plist.

ABS Client/Audiobookshelf swift/Services/AppState.swift

@@ -66,6 +66,9 @@ final class AppState {
     }
 
     func bootstrap() async {
+        #if os(iOS)
+        await NotificationManager.shared.requestPermissionIfNeeded()
+        #endif
         auth.restoreSession()
         network.start { [weak self] online in
             guard let self else { return }