feat(flutter): 重设计剧场与首页 Hero

lib/core/theme/app_dimens.dart

@@ -60,8 +60,10 @@ abstract final class AppDimens {
   static const double accountLabel = 11;
 
   static const double watchPlaceholderHeight = 114;
-  static const double heroBannerHeight = 176;
+  static const double heroBannerHeight = 240;
   static const double heroBannerRadius = 20;
+  static const double heroTitle = 28;
+  static const double heroSubtitle = 14;
 
   static const double cardMeta = 12;
   static const double cardViews = 11;