added guardian login with views for their assigned childs

test/state/app_modules_order_test.dart

@@ -1,4 +1,5 @@
 import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/session/session.dart';
 import 'package:marianum_mobile/state/app/modules/app_modules.dart';
 import 'package:marianum_mobile/storage/modules_settings.dart';
 
@@ -11,9 +12,7 @@ void main() {
         'default position', () {
       // Regression: persisted settings from before the ticker module existed
       // repeatedly made new modules vanish from bar, "Mehr" and settings list.
-      final stale = Modules.values
-          .where((m) => m != Modules.ticker)
-          .toList();
+      final stale = Modules.values.where((m) => m != Modules.ticker).toList();
 
       final effective = AppModule.effectiveModuleOrder(settingsWith(stale));
 
@@ -72,9 +71,7 @@ void main() {
       // visible modules must not move or drop it (previously the raw persisted
       // indices were used, moving the wrong module).
       final effective = AppModule.effectiveModuleOrder(settingsWith([]));
-      final displayed = effective
-          .where((m) => m != Modules.ticker)
-          .toList();
+      final displayed = effective.where((m) => m != Modules.ticker).toList();
       final tickerSlot = effective.indexOf(Modules.ticker);
 
       final result = AppModule.reorderModuleOrder(
@@ -92,4 +89,22 @@ void main() {
       );
     });
   });
+
+  group('isAvailableFor', () {
+    final student = CredentialSession(username: 'max', password: 'pw');
+    const guardian = GuardianSession(email: 'e@x.de');
+
+    test('password accounts see every module', () {
+      for (final m in Modules.values) {
+        expect(AppModule.isAvailableFor(m, student), isTrue, reason: m.name);
+      }
+    });
+
+    test('guardians lose exactly the Nextcloud modules', () {
+      final hidden = Modules.values
+          .where((m) => !AppModule.isAvailableFor(m, guardian))
+          .toSet();
+      expect(hidden, {Modules.talk, Modules.files});
+    });
+  });
 }