merge: 调整二级筛选按钮尺寸

docs/plans/PROGRESS.md

@@ -1111,7 +1111,7 @@ $ flutter test
 
 ## 2026-10-22 首页布局对齐修正
 
-- 一级分类页内切换 6 个列表，未选 18/w400 `#B0B0B0`、选中 20/w700 白字，无下划线；二级 chips 仅精选显示。
+- 一级分类页内切换 6 个列表，未选 18/w400、选中 20/w700；二级 chips 与 26 高筛选按钮仅在精选显示。
 - 四类卡片去底板/描边，封面统一 3:4、8 圆角、行距 10、封底标题间距 6；状态角标为右上角紧凑异形丝带。
 - 标题下方恢复左对齐题材文字，使用 `|` 分隔、灰色小字，与封面状态角标保持独立。
 - 首页搜索栏到一级、一级到二级、二级到网格间距为 8/8/10；非精选 tab 直接以 10 衔接网格。

lib/core/theme/app_dimens.dart

@@ -111,6 +111,9 @@ abstract final class AppDimens {
   static const double homeSecondaryTagHeight = 26;
   static const double homeSecondaryTagHorizontalPadding = 10;
   static const double homeSecondaryTagRadius = 13;
+  static const double homeSecondaryFilterGap = 8;
+  static const double homeSecondaryFilterVisualSize = 26;
+  static const double homeSecondaryFilterIcon = 18;
   static const double homePrimaryCategoryGap = 24;
   static const double homeSecondaryTagGap = 14;
   static const double homeSearchTopGap = 0;

lib/pages/home/widgets/home_grid_header.dart

@@ -329,22 +329,25 @@ class HomeGridHeader extends StatelessWidget {
               ),
             ),
           ),
-          const SizedBox(width: AppDimens.spaceXs),
+          const SizedBox(width: AppDimens.homeSecondaryFilterGap),
           Tooltip(
             message: l10n.filter,
             child: SizedBox.square(
               dimension: AppDimens.tapTarget,
               child: Material(
-                color: AppColors.contentSurface,
-                borderRadius: BorderRadius.circular(AppDimens.inputRadius),
+                color: AppColors.transparent,
                 child: InkWell(
                   key: const Key('home-grid-filter'),
-                  borderRadius: BorderRadius.circular(AppDimens.inputRadius),
                   onTap: callbacks.onOpenFilter,
-                  child: const Icon(
-                    Icons.filter_list_rounded,
-                    color: AppColors.navSelected,
-                    size: AppDimens.homeHeaderIcon,
+                  child: Center(
+                    child: SizedBox.square(
+                      dimension: AppDimens.homeSecondaryFilterVisualSize,
+                      child: const Icon(
+                        Icons.filter_list_rounded,
+                        color: AppColors.textTertiary,
+                        size: AppDimens.homeSecondaryFilterIcon,
+                      ),
+                    ),
                   ),
                 ),
               ),

test/home/home_preview_layout_test.dart

@@ -94,6 +94,18 @@ void main() {
     expect(find.byKey(const Key('home-section-category-社群')), findsOneWidget);
     expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
     expect(find.byKey(const Key('home-grid-filter')), findsOneWidget);
+    expect(
+      tester.getSize(find.byKey(const Key('home-grid-filter'))),
+      const Size.square(AppDimens.tapTarget),
+    );
+    final filterIcon = tester.widget<Icon>(
+      find.descendant(
+        of: find.byKey(const Key('home-grid-filter')),
+        matching: find.byIcon(Icons.filter_list_rounded),
+      ),
+    );
+    expect(filterIcon.size, AppDimens.homeSecondaryFilterIcon);
+    expect(filterIcon.color, AppColors.textTertiary);
     final searchBox = find.descendant(
       of: find.byKey(const Key('home-search-entry')),
       matching: find.byType(Container),