test: 按新 UI 基线重写过期用例

覆盖 155 条失败与 4 处编译错误：入口改走推荐流 tab、弹框换 AppGlowDialog、
rail 尺寸与底部锚定、子页标题字重 w400、底栏选中品牌红、收藏文案改收藏短剧。
全量 flutter test 775 通过。

test/home/app_bottom_nav_test.dart

@@ -9,11 +9,11 @@ import 'package:fruitshorts/core/widgets/app_bottom_nav.dart';
 void main() {
   test('should_use_exact_root_navigation_colors', () {
     expect(AppColors.navBackground, const Color(0xFF000000));
-    expect(AppColors.navSelected, const Color(0xFFFFFFFF));
-    expect(AppColors.navUnselected, const Color(0xFFB0B0B0));
+    expect(AppColors.navSelected, const Color(0xFFF04E4E));
+    expect(AppColors.navUnselected, const Color(0xFFFFFFFF));
   });
 
-  testWidgets('should_render_four_slots_with_white_selected_state', (
+  testWidgets('should_render_four_slots_with_brand_red_selected_state', (
     tester,
   ) async {
     var theaterTaps = 0;