style(home): 观看全集按钮改为半透明白玻璃表面

test/home/feed_watch_all_gradient_test.dart

@@ -1,5 +1,5 @@
 // Author: fruit.com.cn
-// 职责：检查观看全集按钮实际绘制像素，防止配色只配置而不可见。
+// 职责：检查观看全集按钮的玻璃表面确实被绘制出来。
 import 'dart:typed_data';
 import 'dart:ui' as ui;
 
@@ -29,12 +29,16 @@ Future<void> _pumpButton(WidgetTester tester) => tester.pumpWidget(
     localizationsDelegates: AppLocalizations.localizationsDelegates,
     supportedLocales: AppLocalizations.supportedLocales,
     home: Scaffold(
+      backgroundColor: Colors.black,
       body: Center(
         child: RepaintBoundary(
           key: _boundaryKey,
           child: SizedBox(
             width: _width,
-            child: HomeFeedWatchAllBar(drama: _drama, onTap: () {}),
+            child: ColoredBox(
+              color: Colors.black,
+              child: HomeFeedWatchAllBar(drama: _drama, onTap: () {}),
+            ),
           ),
         ),
       ),
@@ -73,15 +77,15 @@ void main() {
         expect(sample.a, 1);
         expect(
           sample.r,
-          closeTo(AppColors.watchAllSurface.r, _surfaceTolerance),
+          closeTo(AppColors.watchAllSurface.a, _surfaceTolerance),
         );
         expect(
           sample.g,
-          closeTo(AppColors.watchAllSurface.g, _surfaceTolerance),
+          closeTo(AppColors.watchAllSurface.a, _surfaceTolerance),
         );
         expect(
           sample.b,
-          closeTo(AppColors.watchAllSurface.b, _surfaceTolerance),
+          closeTo(AppColors.watchAllSurface.a, _surfaceTolerance),
         );
       }
     });