add ticker page bloc and avatar disk cache

test/view/ticker/ticker_scaffold_test.dart

@@ -23,15 +23,11 @@ Widget _host({
   List<TickerNavSection>? sections,
   String? initialSlug,
   void Function(String? slug)? onSelectionChanged,
-  String? homePublishedAt,
-  VoidCallback? onRefreshHome,
 }) => MaterialApp(
   home: TickerScaffold(
     sections: sections ?? _sections(),
     initialSlug: initialSlug,
     onSelectionChanged: onSelectionChanged,
-    homePublishedAt: homePublishedAt,
-    onRefreshHome: onRefreshHome,
     homeBuilder: (context, onLinkTap) => const Text('HOME'),
     pageBuilder: (context, slug, onLinkTap) => Text('PAGE:$slug'),
   ),
@@ -231,50 +227,6 @@ void main() {
     });
   });
 
-  group('home date button', () {
-    testWidgets('shows the publish date on home and refreshes on tap', (
-      tester,
-    ) async {
-      var refreshed = 0;
-      await tester.pumpWidget(
-        _host(
-          homePublishedAt: '2026-02-17T14:30:00',
-          onRefreshHome: () => refreshed++,
-        ),
-      );
-      await tester.pumpAndSettle();
-
-      expect(find.text('17.02.2026, 14:30'), findsOneWidget);
-
-      await tester.tap(find.text('17.02.2026, 14:30'));
-      await tester.pumpAndSettle();
-      expect(refreshed, 1);
-    });
-
-    testWidgets('hides the date button when there is no date', (tester) async {
-      await tester.pumpWidget(_host());
-      await tester.pumpAndSettle();
-
-      expect(find.byIcon(Icons.schedule), findsNothing);
-    });
-
-    testWidgets('hides the date button once a page is open', (tester) async {
-      tester.view.physicalSize = const Size(1200, 2000);
-      tester.view.devicePixelRatio = 1.0;
-      addTearDown(tester.view.resetPhysicalSize);
-      addTearDown(tester.view.resetDevicePixelRatio);
-      await tester.pumpWidget(_host(homePublishedAt: '2026-02-17T14:30:00'));
-      await tester.pumpAndSettle();
-
-      expect(find.byIcon(Icons.schedule), findsOneWidget);
-
-      await tester.tap(find.text('Über uns'));
-      await tester.pumpAndSettle();
-
-      expect(find.byIcon(Icons.schedule), findsNothing);
-    });
-  });
-
   group('back gesture', () {
     testWidgets('pops from a sub-page back to home via the tab navigator', (
       tester,

test/view/ticker/ticker_updated_bar_test.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jiffy/jiffy.dart';
+import 'package:marianum_mobile/view/pages/ticker/widgets/ticker_updated_bar.dart';
+
+Widget _host(String? publishedAt) =>
+    MaterialApp(home: Scaffold(body: TickerUpdatedBar(publishedAt: publishedAt)));
+
+void main() {
+  setUpAll(() async {
+    await Jiffy.setLocale('de');
+  });
+
+  testWidgets('renders the formatted publish date', (tester) async {
+    await tester.pumpWidget(_host('2026-02-17T14:30:00'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Aktualisiert am 17.02.2026 14:30'), findsOneWidget);
+    expect(find.byIcon(Icons.schedule), findsOneWidget);
+  });
+
+  testWidgets('renders nothing without a date', (tester) async {
+    await tester.pumpWidget(_host(null));
+    await tester.pumpAndSettle();
+
+    expect(find.byIcon(Icons.schedule), findsNothing);
+    expect(find.textContaining('Aktualisiert'), findsNothing);
+  });
+
+  testWidgets('renders nothing for an unparseable date', (tester) async {
+    await tester.pumpWidget(_host('not-a-date'));
+    await tester.pumpAndSettle();
+
+    expect(find.byIcon(Icons.schedule), findsNothing);
+  });
+}

test/widget/avatar_disk_cache_test.dart

@@ -0,0 +1,51 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/widget/avatar_disk_cache.dart';
+
+void main() {
+  group('AvatarDiskCache.fileName', () {
+    test('user files carry the size, group files do not', () {
+      expect(
+        AvatarDiskCache.fileName(id: 'alice', isGroup: false, size: 256),
+        'u_616c696365_256',
+      );
+      expect(
+        AvatarDiskCache.fileName(id: 'alice', isGroup: false, size: 64),
+        'u_616c696365_64',
+      );
+      // Groups are served at one fixed size — the size argument is ignored.
+      expect(
+        AvatarDiskCache.fileName(id: 'room1', isGroup: true, size: 512),
+        AvatarDiskCache.fileName(id: 'room1', isGroup: true, size: 64),
+      );
+      expect(
+        AvatarDiskCache.fileName(id: 'room1', isGroup: true, size: 0),
+        startsWith('g_'),
+      );
+    });
+
+    test('names are file-safe even for exotic ids', () {
+      final name = AvatarDiskCache.fileName(
+        id: 'a/b c@d',
+        isGroup: false,
+        size: 128,
+      );
+      expect(name, matches(RegExp(r'^u_[0-9a-f]+_128$')));
+    });
+
+    test(
+      'a short id evict prefix never matches a longer id file (hex + _ '
+      'separator keeps the boundary unambiguous)',
+      () {
+        // Eviction deletes files starting with `u_<hex(id)>_`.
+        final shortPrefix =
+            'u_${AvatarDiskCache.fileName(id: 'a', isGroup: false, size: 1).split('_')[1]}_';
+        final longFile = AvatarDiskCache.fileName(
+          id: 'a_b',
+          isGroup: false,
+          size: 256,
+        );
+        expect(longFile.startsWith(shortPrefix), isFalse);
+      },
+    );
+  });
+}