style(home): 匹配观看全集设计稿配色

test/home/feed_info_hierarchy_test.dart

@@ -260,23 +260,15 @@ void main() {
     _expectNoShadows(tester);
   });
 
-  testWidgets('should_use_small_radius_and_brand_gradient_when_watching_all', (
-    tester,
-  ) async {
+  testWidgets('should_use_reference_surface_when_watching_all', (tester) async {
     await _pump(tester);
     final background = find.byKey(const Key('home-feed-full-series-bg'));
     final decorated = tester.widget<DecoratedBox>(
-      find.byKey(const Key('home-feed-full-series-gradient')),
+      find.byKey(const Key('home-feed-full-series-surface')),
     );
     final decoration = decorated.decoration as BoxDecoration;
-    expect((decoration.gradient! as LinearGradient).colors, [
-      AppColors.mineStatShade,
-      AppColors.brandRed,
-      AppColors.vipButtonEnd,
-    ]);
-    final gradient = decoration.gradient! as LinearGradient;
-    expect(gradient.begin, Alignment.centerLeft);
-    expect(gradient.end, Alignment.centerRight);
+    expect(decoration.color, AppColors.watchAllSurface);
+    expect(decoration.gradient, isNull);
     expect(tester.widget<Text>(find.text('Watch all')).style?.fontSize, 16);
     expect(
       tester.widget<Text>(find.text('Watch all')).style?.fontWeight,

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，防止渐变只配置而不可见。
+// 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。
 import 'dart:typed_data';
 import 'dart:ui' as ui;
 
@@ -10,15 +10,16 @@ import 'package:fruitshorts/core/data/models/drama.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/player/widgets/home_feed_recommend_panel.dart';
 
-const _boundaryKey = Key('watch-gradient-boundary');
+const _boundaryKey = Key('watch-surface-boundary');
 const _width = 280.0;
 const _sampleInset = 16;
 const _sampleY = 4;
 const _rgbaChannels = 4;
-const _minimumRedDelta = 50;
+const _surfaceChannel = 0.2;
+const _surfaceTolerance = 0.01;
 const _drama = Drama(
-  id: 'gradient',
-  title: 'Gradient',
+  id: 'surface',
+  title: 'Surface',
   synopsis: '',
   posterUrl: '',
 );
@@ -52,7 +53,7 @@ Color _sample(ByteData bytes, int width, int x) {
 }
 
 void main() {
-  testWidgets('should_paint_visible_red_gradient_instead_of_flat_fill', (
+  testWidgets('should_paint_reference_dark_surface_when_watching_all', (
     tester,
   ) async {
     await _pumpButton(tester);
@@ -68,11 +69,12 @@ void main() {
       final middle = _sample(bytes, image.width, image.width ~/ 2);
       final right = _sample(bytes, image.width, image.width - _sampleInset);
       image.dispose();
-      expect(left.a, 1);
-      expect(right.a, 1);
-      expect((right.r - left.r) * 255, greaterThan(_minimumRedDelta));
-      expect(left.g, lessThan(middle.g));
-      expect(middle.g, lessThan(right.g));
+      for (final sample in [left, middle, right]) {
+        expect(sample.a, 1);
+        expect(sample.r, closeTo(_surfaceChannel, _surfaceTolerance));
+        expect(sample.g, closeTo(_surfaceChannel, _surfaceTolerance));
+        expect(sample.b, closeTo(_surfaceChannel, _surfaceTolerance));
+      }
     });
   });
 }