feat(flutter): 统一二级页头并恢复新剧暖色

test/notice/notices_entry_test.dart

@@ -52,6 +52,13 @@ void main() {
     await tester.pumpAndSettle();
 
     expect(find.byKey(const Key('notices-page')), findsOneWidget);
+    expect(
+      tester.getSize(find.byKey(const Key('notices-back'))),
+      const Size(36, 36),
+    );
+    final title = tester.widget<Text>(find.byKey(const Key('subpage-title')));
+    expect(title.style?.fontSize, 18);
+    expect(title.style?.fontWeight, FontWeight.w800);
     expect(find.byKey(const Key('auth-gate-panel')), findsNothing);
   });
 }