fix(home): 调整一级分类未选字号

lib/core/theme/app_colors.dart

@@ -80,6 +80,7 @@ abstract final class AppColors {
   static const textPrimary = Color(0xFFFFFFFF);
   static const textSecondary = Color(0xFF8E8E93);
   static const textTertiary = Color(0xFF9E9E9E);
+  static const textTabInactive = Color(0xFFB0B0B0);
 
   /// 原生开屏与冷启动过渡底色。
   static const splashInk = ink;

lib/core/theme/app_dimens.dart

@@ -100,7 +100,7 @@ abstract final class AppDimens {
   static const double cardTitleTagGap = 6;
   static const double cardCoverAspectRatio = 5 / 6;
   static const double homeCardBodyExtent = 84;
-  static const double homePrimaryTabFont = 16;
+  static const double homePrimaryTabFont = 18;
   static const double homePrimaryTabSelectedFont = 20;
   static const double homePrimaryRowHeight = 30;
   static const Duration homePrimaryTabAnimationDuration = Duration(

lib/pages/home/widgets/home_grid_header.dart

@@ -286,7 +286,7 @@ class HomeGridHeader extends StatelessWidget {
               style: TextStyle(
                 color: selected
                     ? AppColors.navSelected
-                    : AppColors.textTertiary,
+                    : AppColors.textTabInactive,
                 fontSize: selected
                     ? AppDimens.homePrimaryTabSelectedFont
                     : AppDimens.homePrimaryTabFont,