fix(home): 稳定二级标签切换布局

lib/pages/home/widgets/home_grid_header.dart

@@ -366,10 +366,10 @@ class HomeGridHeader extends StatelessWidget {
     final selected = selectedTag == tag.id;
     final label = Text(
       tag.label,
-      style: TextStyle(
+      style: const TextStyle(
         color: selected ? AppColors.navSelected : AppColors.textTertiary,
         fontSize: AppDimens.homeSecondaryTagFont,
-        fontWeight: selected ? FontWeight.w600 : FontWeight.w400,
+        fontWeight: FontWeight.w600,
         letterSpacing: 0,
       ),
     );
@@ -377,25 +377,21 @@ class HomeGridHeader extends StatelessWidget {
       key: Key('home-tag-${tag.id}'),
       borderRadius: BorderRadius.circular(AppDimens.pillRadius),
       onTap: () => onTagSelected(selected ? null : tag.id),
-      child: selected
-          ? Container(
-              height: AppDimens.homeSecondaryTagHeight,
-              padding: const EdgeInsets.symmetric(
-                horizontal: AppDimens.homeSecondaryTagHorizontalPadding,
-              ),
-              alignment: Alignment.center,
-              decoration: BoxDecoration(
-                color: AppColors.contentSurface,
-                borderRadius: BorderRadius.circular(
-                  AppDimens.homeSecondaryTagRadius,
-                ),
-              ),
-              child: label,
-            )
-          : SizedBox(
-              height: AppDimens.homeSecondaryTagHeight,
-              child: Align(alignment: Alignment.centerLeft, child: label),
-            ),
+      child: AnimatedContainer(
+        key: Key('home-tag-animated-${tag.id}'),
+        duration: AppDimens.homeSecondaryTagAnimationDuration,
+        curve: Curves.easeOut,
+        height: AppDimens.homeSecondaryTagHeight,
+        padding: const EdgeInsets.symmetric(
+          horizontal: AppDimens.homeSecondaryTagHorizontalPadding,
+        ),
+        alignment: Alignment.center,
+        decoration: BoxDecoration(
+          color: selected ? AppColors.contentSurface : AppColors.transparent,
+          borderRadius: BorderRadius.circular(AppDimens.homeSecondaryTagRadius),
+        ),
+        child: label,
+      ),
     );
   }
 }