fix(recommend): 修正筛选左起始与横向滑动

docs/plans/PROGRESS.md

@@ -1216,3 +1216,5 @@ $ flutter test
 - 四行首项文字统一到同一 x；行高 30、行距 6、项目距 12，第 4 行保持弹性空白后固定筛选图标。
 - 按最新截图改为 16sp、32 高、10 行距、16 项距；选中态为 `#21090E` 底配 `#FF4D6A` 粉字。
 - 第 4 行复用选中胶囊样式，右侧改为 44×44 圆形深灰按钮和 22 三横线图标；`flutter analyze` 无问题。
+- 筛选行距收紧到 6、项距 10，chip 左右 padding 12；四行均可横向回弹滑动。
+- 第 4 行仅最热/最新在滚动区内，44 圆形筛选按钮固定在滚动区外；`flutter analyze` 无问题。

lib/core/theme/app_dimens.dart

@@ -140,9 +140,9 @@ abstract final class AppDimens {
   static const double filterChipFont = 16;
   static const double filterChipHeight = 32;
   static const double filterChipRadius = 16;
-  static const double filterChipHorizontalPadding = 14;
-  static const double filterRowGap = 10;
-  static const double filterItemGap = 16;
+  static const double filterChipHorizontalPadding = 12;
+  static const double filterRowGap = 6;
+  static const double filterItemGap = 10;
   static const double allDramasHorizontal = 12;
   static const double allDramasGridGap = 6;
   static const double allDramasGridRowGap = 12;

lib/pages/recommend/widgets/all_dramas_filter_grid.dart

@@ -190,8 +190,11 @@ class _AllDramasFilterGridState extends State<AllDramasFilterGrid> {
       child: SizedBox(
         height: AppDimens.filterChipHeight,
         child: SingleChildScrollView(
+          key: Key('all-filter-scroll-$row'),
           scrollDirection: Axis.horizontal,
+          physics: const BouncingScrollPhysics(),
           child: Row(
+            mainAxisSize: MainAxisSize.min,
             mainAxisAlignment: MainAxisAlignment.start,
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
@@ -274,20 +277,34 @@ class _AllDramasFilterGridState extends State<AllDramasFilterGrid> {
         mainAxisAlignment: MainAxisAlignment.start,
         crossAxisAlignment: CrossAxisAlignment.center,
         children: [
-          _chip(
-            key: const Key('all-sort-hot'),
-            label: l10n.hot,
-            selected: !_newest,
-            onTap: () => setState(() => _newest = false),
+          Expanded(
+            child: SingleChildScrollView(
+              key: const Key('all-filter-scroll-3'),
+              scrollDirection: Axis.horizontal,
+              physics: const BouncingScrollPhysics(),
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                mainAxisAlignment: MainAxisAlignment.start,
+                crossAxisAlignment: CrossAxisAlignment.center,
+                children: [
+                  _chip(
+                    key: const Key('all-sort-hot'),
+                    label: l10n.hot,
+                    selected: !_newest,
+                    onTap: () => setState(() => _newest = false),
+                  ),
+                  const SizedBox(width: AppDimens.filterItemGap),
+                  _chip(
+                    key: const Key('all-sort-new'),
+                    label: l10n.newest,
+                    selected: _newest,
+                    onTap: () => setState(() => _newest = true),
+                  ),
+                ],
+              ),
+            ),
           ),
           const SizedBox(width: AppDimens.filterItemGap),
-          _chip(
-            key: const Key('all-sort-new'),
-            label: l10n.newest,
-            selected: _newest,
-            onTap: () => setState(() => _newest = true),
-          ),
-          const Spacer(),
           Material(
             key: const Key('all-dramas-filter-page-button'),
             color: AppColors.filterMenuButton,

test/recommend/recommend_sections_test.dart

@@ -247,6 +247,11 @@ void main() {
     expect(delegate.mainAxisSpacing, AppDimens.allDramasGridRowGap);
     for (var row = 0; row < 4; row++) {
       expect(find.byKey(Key('all-filter-row-$row')), findsOneWidget);
+      final scroll = tester.widget<SingleChildScrollView>(
+        find.byKey(Key('all-filter-scroll-$row')),
+      );
+      expect(scroll.scrollDirection, Axis.horizontal);
+      expect(scroll.physics, isA<BouncingScrollPhysics>());
     }
     final filterStarts = [
       for (var row = 0; row < 4; row++)
@@ -355,6 +360,10 @@ void main() {
       of: rowZero,
       matching: find.byKey(const Key('all-filter-local')),
     );
+    expect(
+      tester.getTopLeft(rowZeroAll).dx,
+      closeTo(pageRect.left + AppDimens.feedPageHorizontal, 0.1),
+    );
     expect(
       tester.getTopLeft(rowZeroLocal).dx - tester.getTopRight(rowZeroAll).dx,
       AppDimens.filterItemGap,
@@ -426,6 +435,13 @@ void main() {
       BorderRadius.circular(AppDimens.filterChipRadius),
     );
     final filterButton = find.byKey(const Key('all-dramas-filter-page'));
+    expect(
+      find.descendant(
+        of: find.byKey(const Key('all-filter-scroll-3')),
+        matching: filterButton,
+      ),
+      findsNothing,
+    );
     expect(
       tester.getSize(filterButton),
       const Size.square(AppDimens.allDramasFilterButton),