added guardian login with views for their assigned childs

lib/view/pages/settings/settings.dart

@@ -1,35 +1,49 @@
 import 'package:flutter/material.dart';
 
+import '../../../access/access_requirement.dart';
+import '../../../session/session_manager.dart';
 import 'sections/about_section.dart';
 import 'sections/account_section.dart';
 import 'sections/appearance_section.dart';
 import 'sections/files_section.dart';
 import 'sections/modules_section.dart';
+import 'sections/notifications_section.dart';
 import 'sections/talk_section.dart';
 import 'sections/timetable_section.dart';
 
 class Settings extends StatelessWidget {
   const Settings({super.key});
 
+  /// Sections in display order with the backend identities they need;
+  /// sections the session cannot use are left out.
+  static const List<(Widget, Set<AccessRequirement>)> _sections = [
+    (AccountSection(), {}),
+    (AppearanceSection(), {}),
+    (ModulesSection(), {}),
+    (TimetableSection(), {}),
+    (NotificationsSection(), {}),
+    (TalkSection(), {AccessRequirement.nextcloud}),
+    (FilesSection(), {AccessRequirement.nextcloud}),
+    (AboutSection(), {}),
+  ];
+
   @override
-  Widget build(BuildContext context) => Scaffold(
-    appBar: AppBar(title: const Text('Einstellungen')),
-    body: ListView(
-      children: const [
-        AccountSection(),
-        Divider(),
-        AppearanceSection(),
-        Divider(),
-        ModulesSection(),
-        Divider(),
-        TimetableSection(),
-        Divider(),
-        TalkSection(),
-        Divider(),
-        FilesSection(),
-        Divider(),
-        AboutSection(),
-      ],
-    ),
-  );
+  Widget build(BuildContext context) {
+    final session = SessionManager().current;
+    final visible = [
+      for (final (section, requirements) in _sections)
+        if (requirements.areMetBy(session)) section,
+    ];
+    return Scaffold(
+      appBar: AppBar(title: const Text('Einstellungen')),
+      body: ListView(
+        children: [
+          for (final (i, section) in visible.indexed) ...[
+            if (i > 0) const Divider(),
+            section,
+          ],
+        ],
+      ),
+    );
+  }
 }