tweaking download

hartmann-foto-documentation-frontend/lib/pages/customer/customer_widget.dart

@@ -337,8 +337,24 @@ class _CustomerWidgetState extends State<CustomerWidget> {
   }
 
   Future<void> _actionDownload(BuildContext context, CustomerDto customerDto, PictureDto? pictureDto) async {
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (context) => const Center(child: CircularProgressIndicator()),
+    );
+
+    try {
       final bytes = await _customerController.export(customerId: customerDto.id, pictureId: pictureDto?.id);
       final fileName = pictureDto != null ? '${customerDto.customerNumber}_${pictureDto.id}.pdf' : '${customerDto.customerNumber}.pdf';
+      if (context.mounted) {
+        Navigator.of(context).pop();
+      }
       await downloadFile(bytes, fileName);
+    } catch (e) {
+      if (context.mounted) {
+        Navigator.of(context).pop();
+      }
+      rethrow;
+    }
   }
 }