startNotificationPolling method
Start polling for notifications from a remote server.
Implementation
@override
Future<bool> startNotificationPolling({
required String pollingUrl,
int? intervalMinutes,
}) async {
// Web doesn't have background services like Android
// We could use Periodic Background Sync API, but it's not widely supported
// For now, we'll just return false to indicate it's not supported
return false;
}