fix(home): 收紧首页顶部区间距

lib/pages/home/widgets/home_grid_header.dart

@@ -81,7 +81,10 @@ class HomeGridHeader extends StatelessWidget {
       children: [
         _searchRow(l10n),
         _primaryRow(l10n),
-        if (selectedPrimary == HomePrimaryTab.featured) _tagRow(l10n),
+        if (selectedPrimary == HomePrimaryTab.featured)
+          _tagRow(l10n)
+        else
+          const SizedBox(height: AppDimens.homeSecondaryGridGap),
       ],
     );
   }
@@ -90,9 +93,9 @@ class HomeGridHeader extends StatelessWidget {
     return Padding(
       padding: const EdgeInsets.fromLTRB(
         AppDimens.feedPageHorizontal,
-        AppDimens.spaceSm,
+        AppDimens.homeSearchTopGap,
         AppDimens.feedPageHorizontal,
-        AppDimens.spaceSm,
+        AppDimens.homeSearchPrimaryGap,
       ),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -302,9 +305,9 @@ class HomeGridHeader extends StatelessWidget {
     return Padding(
       padding: const EdgeInsets.fromLTRB(
         AppDimens.feedPageHorizontal,
-        AppDimens.spaceMd,
+        AppDimens.homePrimarySecondaryGap,
         AppDimens.feedPageHorizontal,
-        AppDimens.spaceSm,
+        AppDimens.homeSecondaryGridGap,
       ),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,