fix(home): 优化短剧列表下拉刷新体验

test/core/app_pull_to_refresh_test.dart

@@ -12,7 +12,7 @@ void main() {
   testWidgets('should_freeze_pull_offset_until_refresh_completes', (
     tester,
   ) async {
-    expect(AppPullToRefresh.physics.parent, isA<ClampingScrollPhysics>());
+    expect(AppPullToRefresh.physics.parent, isA<BouncingScrollPhysics>());
     final refresh = Completer<void>();
     var calls = 0;
     await tester.pumpWidget(
@@ -48,7 +48,7 @@ void main() {
     expect(_contentOffset(tester), greaterThan(0));
     expect(
       tester.widget<Text>(find.text('Pull to refresh')).style?.color,
-      AppColors.blue,
+      AppColors.navSelected,
     );
 
     await gesture.moveBy(const Offset(0, 120));
@@ -56,7 +56,7 @@ void main() {
     expect(find.text('Release to refresh'), findsOneWidget);
     expect(
       tester.widget<Text>(find.text('Release to refresh')).style?.color,
-      AppColors.blue,
+      AppColors.navSelected,
     );
 
     await gesture.up();
@@ -64,7 +64,7 @@ void main() {
     expect(find.text('Refreshing…'), findsOneWidget);
     expect(
       tester.widget<Text>(find.text('Refreshing…')).style?.color,
-      AppColors.blue,
+      AppColors.navSelected,
     );
     expect(calls, 1);
     final releaseOffset = _contentOffset(tester);