simplified code across the app and consolidated duplicated helpers

lib/widget/async_actions/async_action_controller.dart

@@ -8,6 +8,11 @@ typedef AsyncErrorBuilder = String Function(Object error);
 TextStyle _asyncErrorTextStyle(BuildContext context) =>
     TextStyle(color: Theme.of(context).colorScheme.error, fontSize: 13);
 
+Widget _leadingLabel(Widget leading, Widget label) => Row(
+  mainAxisSize: MainAxisSize.min,
+  children: [leading, const SizedBox(width: 8), label],
+);
+
 /// Wraps [action] with a try/catch that pops up an [InfoDialog] on failure
 /// (using [errorBuilder] or the default error mapper). Returns `true` on
 /// success, `false` on caught failure.
@@ -23,14 +28,7 @@ Future<bool> runWithErrorDialog(
   } catch (e) {
     Haptics.error();
     if (!context.mounted) return false;
-    final message = errorBuilder != null
-        ? errorBuilder(e)
-        : errorToUserMessage(e);
-    final details = errorToTechnicalDetails(e);
-    final body = details != null && details != message
-        ? '$message\n\n$details'
-        : message;
-    InfoDialog.show(context, body, copyable: true, title: 'Fehler');
+    InfoDialog.showError(context, e, message: errorBuilder?.call(e));
     return false;
   }
 }
@@ -55,14 +53,13 @@ class AsyncActionController extends ChangeNotifier {
     notifyListeners();
     try {
       await action();
-      _busy = false;
-      notifyListeners();
       return true;
     } catch (e) {
-      _busy = false;
       _error = errorBuilder != null ? errorBuilder(e) : errorToUserMessage(e);
-      notifyListeners();
       return false;
+    } finally {
+      _busy = false;
+      notifyListeners();
     }
   }