fixed guardian login edge cases and misleading placeholders on failed loads

lib/widget/child_switcher.dart

@@ -5,6 +5,8 @@ import '../api/marianumconnect/queries/get_capabilities/guardian_child.dart';
 import '../state/app/modules/capabilities/bloc/capabilities_cubit.dart';
 import '../state/app/modules/children/child_selection_cubit.dart';
 import '../utils/haptics.dart';
+import 'app_progress_indicator.dart';
+import 'async_action_button.dart';
 import 'centered_leading.dart';
 import 'details_bottom_sheet.dart';
 import 'placeholder_view.dart';
@@ -71,15 +73,37 @@ class ChildTile extends StatelessWidget {
   );
 }
 
-/// Shown by per-child modules while a guardian has no linked child.
+/// Shown by per-child modules while a guardian has no linked child. The
+/// children come from `me/capabilities`, so a failed or pending load must not
+/// be presented as "no child assigned" — that sends parents to the secretariat
+/// over a network error.
 class NoChildrenPlaceholder extends StatelessWidget {
   const NoChildrenPlaceholder({super.key});
 
   @override
-  Widget build(BuildContext context) => const PlaceholderView(
-    icon: Icons.family_restroom_outlined,
-    text:
-        'Deinem Konto ist noch kein Kind zugeordnet. Bitte wende dich an '
-        'das Sekretariat.',
-  );
+  Widget build(BuildContext context) {
+    final capabilities = context.watch<CapabilitiesCubit>().state;
+    if (!capabilities.loaded) {
+      return const Center(child: AppProgressIndicator.large());
+    }
+    if (capabilities.loadFailed) {
+      return PlaceholderView(
+        icon: Icons.cloud_off_outlined,
+        text:
+            'Die zugeordneten Kinder konnten nicht geladen werden. Bitte '
+            'prüfe deine Internetverbindung.',
+        button: AsyncActionButton(
+          icon: Icons.refresh,
+          onPressed: context.read<CapabilitiesCubit>().load,
+          child: const Text('Erneut versuchen'),
+        ),
+      );
+    }
+    return const PlaceholderView(
+      icon: Icons.family_restroom_outlined,
+      text:
+          'Deinem Konto ist noch kein Kind zugeordnet. Bitte wende dich an '
+          'das Sekretariat.',
+    );
+  }
 }