fix(home): 移除二级标签筛选按钮

lib/core/theme/app_colors.dart

@@ -92,7 +92,6 @@ abstract final class AppColors {
   static const textSecondary = Color(0xFF8E8E93);
   static const textTertiary = Color(0xFF9E9E9E);
   static const textTabInactive = Color(0xFFB0B0B0);
-  static const textFilterIcon = Color(0xFF7A7A7E);
 
   /// 原生开屏与冷启动过渡底色。
   static const splashInk = ink;

lib/core/theme/app_dimens.dart

@@ -114,10 +114,6 @@ abstract final class AppDimens {
   static const Duration homeSecondaryTagAnimationDuration = Duration(
     milliseconds: 150,
   );
-  static const double homeSecondaryFilterGap = 6;
-  static const double homeSecondaryFilterVisualSize = 26;
-  static const double homeSecondaryFilterIcon = 16;
-  static const double homeSecondaryFilterStroke = 1.7;
   static const double homePrimaryCategoryGap = 24;
   static const double homeSecondaryTagGap = 10;
   static const double homeSearchTopGap = 0;