test(client): 用例名统一为 should_<期望>_when_<条件>（155/155）

为什么：红线第 8 条门禁立即生效，要求 Flutter 测试命名合规；此前 155 条用例名是英文自然语言
或中文描述，合规数 0/155，属存量欠账，按"先补齐再上新功能"在本批处理。

- 25 个测试文件、155 条用例改名，按「文件 + 旧名」精确定位，每条断言命中恰好 1 次才替换
- 只改名字字面量：改动行 155 删 + 155 增，无一行不含字符串字面量（断言与用例体零改动）
- 门禁：dart analyze lib test = No issues found；flutter test = 155 全过

test/widget_test.dart

@@ -28,7 +28,7 @@ void main() {
   });
 
   testWidgets(
-    'home swipe promotes next without recreating it or showing loading',
+    'should_promote_next_without_recreating_it_or_showing_loading_when_home_is_swiped',
     (tester) async {
       final created = <String>[];
       await tester.pumpWidget(
@@ -57,7 +57,7 @@ void main() {
     },
   );
 
-  testWidgets('immersive home opens the series detail', (tester) async {
+  testWidgets('should_open_series_detail_when_immersive_home_is_tapped', (tester) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -82,7 +82,7 @@ void main() {
     expect(find.byTooltip('Explore series'), findsNothing);
   });
 
-  testWidgets('clear screen hides tabs and restores them on tap', (
+  testWidgets('should_hide_tabs_and_restore_them_when_clear_screen_is_tapped', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 844);
@@ -107,7 +107,7 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
-  testWidgets('home quick drawer opens current series and switches root tabs', (
+  testWidgets('should_open_current_series_and_switch_root_tabs_when_quick_drawer_is_used', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(360, 720);
@@ -162,7 +162,7 @@ void main() {
     );
   });
 
-  testWidgets('interface language changes without a caption control', (
+  testWidgets('should_change_interface_language_when_locale_is_picked', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 844);
@@ -193,7 +193,7 @@ void main() {
     expect(find.text('热门'), findsOneWidget);
   });
 
-  testWidgets('home controls fit a compact Android viewport', (tester) async {
+  testWidgets('should_fit_compact_android_viewport_when_home_controls_are_shown', (tester) async {
     tester.view.physicalSize = const Size(360, 720);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -217,7 +217,7 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
-  testWidgets('My page fits a compact Android viewport and returns home', (
+  testWidgets('should_fit_compact_android_viewport_and_return_home_when_my_page_is_shown', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(360, 720);
@@ -241,7 +241,7 @@ void main() {
   });
 
   testWidgets(
-    'Discover shows three mock playable dramas and one pending poster',
+    'should_show_three_playable_dramas_and_one_pending_poster_when_discover_is_opened',
     (tester) async {
       tester.view.physicalSize = const Size(360, 720);
       tester.view.devicePixelRatio = 1;
@@ -276,7 +276,7 @@ void main() {
     },
   );
 
-  testWidgets('bottom tabs stay on one route', (tester) async {
+  testWidgets('should_stay_on_one_route_when_bottom_tabs_are_used', (tester) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -327,7 +327,7 @@ void main() {
   });
 
   testWidgets(
-    'home swipe changes drama, entered player swipe changes episode',
+    'should_change_drama_on_home_swipe_and_episode_on_player_swipe_when_swiping',
     (tester) async {
       tester.view.physicalSize = const Size(390, 844);
       tester.view.devicePixelRatio = 1;
@@ -359,7 +359,7 @@ void main() {
     },
   );
 
-  testWidgets('shorts page has no category navigation', (tester) async {
+  testWidgets('should_hide_category_navigation_when_shorts_page_is_shown', (tester) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -381,7 +381,7 @@ void main() {
     expect(find.text('City Lights & Velvet Nights'), findsOneWidget);
     expect(tester.takeException(), isNull);
   });
-  testWidgets('right rail saves, comments, likes and invokes share in order', (
+  testWidgets('should_save_comment_like_and_share_in_order_when_right_rail_is_used', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 844);
@@ -439,7 +439,7 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
-  testWidgets('system back opens the drawer and stays on home', (tester) async {
+  testWidgets('should_open_drawer_and_stay_on_home_when_system_back_is_pressed', (tester) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -466,7 +466,7 @@ void main() {
     );
   });
 
-  testWidgets('My watchlist lists saved dramas across the home feed', (
+  testWidgets('should_list_saved_dramas_across_home_feed_when_watchlist_is_opened', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 844);