fix(home): 修正二级筛选按钮右对齐

docs/plans/PROGRESS.md

@@ -1138,3 +1138,9 @@ $ flutter test
 - 播放器进度监听改为具名回调，在切换、重建会话和 dispose 时解绑；评论输入弹窗补 controller 更换迁移。
 - `_onFeedChanged` 已无源码调用链，报错来源为热重载前注册的旧 tear-off；需完全关闭 App 后冷启动。
 - 按当前流程未执行 analyze/test。
+
+## 2026-10-22 二级标签筛选按钮右对齐
+
+- 三横线热区由 44 宽改为 26×26，消除 44 宽居中盒造成的视觉右边距偏移。
+- 标签滚动区与按钮间距改为 6，按钮右边缘固定对齐页面 14 边距。
+- 补充按钮尺寸与屏幕右边距断言；按当前流程未执行 analyze/test。

lib/core/theme/app_dimens.dart

@@ -114,7 +114,7 @@ abstract final class AppDimens {
   static const Duration homeSecondaryTagAnimationDuration = Duration(
     milliseconds: 150,
   );
-  static const double homeSecondaryFilterGap = 8;
+  static const double homeSecondaryFilterGap = 6;
   static const double homeSecondaryFilterVisualSize = 26;
   static const double homeSecondaryFilterIcon = 16;
   static const double homeSecondaryFilterStroke = 1.7;

lib/pages/home/widgets/home_grid_header.dart

@@ -333,7 +333,7 @@ class HomeGridHeader extends StatelessWidget {
         AppDimens.homeSecondaryGridGap,
       ),
       child: Row(
-        crossAxisAlignment: CrossAxisAlignment.start,
+        crossAxisAlignment: CrossAxisAlignment.center,
         mainAxisAlignment: MainAxisAlignment.start,
         children: [
           Expanded(
@@ -355,9 +355,8 @@ class HomeGridHeader extends StatelessWidget {
           const SizedBox(width: AppDimens.homeSecondaryFilterGap),
           Tooltip(
             message: l10n.filter,
-            child: SizedBox(
-              width: AppDimens.tapTarget,
-              height: AppDimens.homeSecondaryFilterVisualSize,
+            child: SizedBox.square(
+              dimension: AppDimens.homeSecondaryFilterVisualSize,
               child: Material(
                 color: AppColors.transparent,
                 child: InkWell(

test/home/home_preview_layout_test.dart

@@ -96,7 +96,7 @@ void main() {
     expect(find.byKey(const Key('home-grid-filter')), findsOneWidget);
     expect(
       tester.getSize(find.byKey(const Key('home-grid-filter'))),
-      const Size(AppDimens.tapTarget, AppDimens.homeSecondaryFilterVisualSize),
+      const Size.square(AppDimens.homeSecondaryFilterVisualSize),
     );
     expect(
       tester.getSize(find.byKey(const Key('home-secondary-filter-visual'))),
@@ -106,6 +106,14 @@ void main() {
       tester.getCenter(find.byKey(const Key('home-grid-filter'))).dy,
       closeTo(tester.getCenter(find.byKey(const Key('home-tag-hot'))).dy, 0.1),
     );
+    expect(
+      tester.getRect(find.byKey(const Key('home-grid-filter'))).right,
+      closeTo(
+        tester.getRect(find.byKey(const Key('home-grid'))).right -
+            AppDimens.feedPageHorizontal,
+        0.1,
+      ),
+    );
     final filterIcon = tester.widget<CustomPaint>(
       find.byKey(const Key('home-secondary-filter-icon')),
     );