fix(home): 优化二级标签选中样式

lib/core/theme/app_dimens.dart

@@ -106,9 +106,12 @@ abstract final class AppDimens {
   static const Duration homePrimaryTabAnimationDuration = Duration(
     milliseconds: 180,
   );
-  static const double homeSecondaryTagFont = 13;
+  static const double homeSecondaryTagFont = 15;
+  static const double homeSecondaryTagHeight = 26;
+  static const double homeSecondaryTagHorizontalPadding = 10;
+  static const double homeSecondaryTagRadius = 13;
   static const double homePrimaryCategoryGap = 24;
-  static const double homeSecondaryTagGap = 18;
+  static const double homeSecondaryTagGap = 14;
   static const double homeSearchTopGap = 0;
   static const double homeSearchPrimaryGap = 8;
   static const double homePrimarySecondaryGap = 8;

lib/pages/home/widgets/home_grid_header.dart

@@ -362,7 +362,7 @@ class HomeGridHeader extends StatelessWidget {
       style: TextStyle(
         color: selected ? AppColors.navSelected : AppColors.textTertiary,
         fontSize: AppDimens.homeSecondaryTagFont,
-        fontWeight: selected ? FontWeight.w700 : FontWeight.w400,
+        fontWeight: selected ? FontWeight.w600 : FontWeight.w400,
         letterSpacing: 0,
       ),
     );
@@ -372,19 +372,22 @@ class HomeGridHeader extends StatelessWidget {
       onTap: () => onTagSelected(selected ? null : tag.id),
       child: selected
           ? Container(
+              height: AppDimens.homeSecondaryTagHeight,
               padding: const EdgeInsets.symmetric(
-                horizontal: AppDimens.spaceMd,
-                vertical: AppDimens.spaceSm,
+                horizontal: AppDimens.homeSecondaryTagHorizontalPadding,
               ),
+              alignment: Alignment.center,
               decoration: BoxDecoration(
                 color: AppColors.contentSurface,
-                borderRadius: BorderRadius.circular(AppDimens.pillRadius),
+                borderRadius: BorderRadius.circular(
+                  AppDimens.homeSecondaryTagRadius,
+                ),
               ),
               child: label,
             )
-          : Padding(
-              padding: const EdgeInsets.symmetric(vertical: AppDimens.spaceSm),
-              child: label,
+          : SizedBox(
+              height: AppDimens.homeSecondaryTagHeight,
+              child: Align(alignment: Alignment.centerLeft, child: label),
             ),
     );
   }