fix(ui): 骨架屏扫光收窄压淡

test/discover/drama_grid_skeleton_test.dart

@@ -5,7 +5,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:fruitshorts/core/widgets/drama_grid_skeleton.dart';
 
 void main() {
-  testWidgets('renders one local shimmer mask per skeleton card', (
+  testWidgets('renders one narrow highlight overlay per skeleton card', (
     tester,
   ) async {
     tester.view.physicalSize = const Size(390, 1000);
@@ -28,20 +28,34 @@ void main() {
     await tester.pump(const Duration(milliseconds: 100));
 
     expect(find.byType(GridView), findsOneWidget);
-    expect(
-      find.ancestor(
-        of: find.byType(GridView),
-        matching: find.byType(ShaderMask),
-      ),
-      findsNothing,
-    );
+    expect(find.byType(ShaderMask), findsNothing);
     for (var index = 0; index < 9; index++) {
       final card = find.byKey(Key('drama-grid-skeleton-$index'));
       expect(card, findsOneWidget);
       expect(
-        find.ancestor(of: card, matching: find.byType(ShaderMask)),
+        find.descendant(of: card, matching: find.byType(IgnorePointer)),
         findsOneWidget,
       );
+      final overlay = find.descendant(
+        of: card,
+        matching: find.byWidgetPredicate(
+          (widget) =>
+              widget is DecoratedBox &&
+              widget.decoration is BoxDecoration &&
+              (widget.decoration as BoxDecoration).gradient != null,
+        ),
+      );
+      expect(overlay, findsOneWidget);
+      final decoration =
+          tester.widget<DecoratedBox>(overlay).decoration as BoxDecoration;
+      final gradient = decoration.gradient! as LinearGradient;
+      expect(gradient.colors, const [
+        Colors.transparent,
+        Color(0x0DFFFFFF),
+        Colors.transparent,
+      ]);
+      expect(gradient.stops, const [0.42, 0.5, 0.58]);
+      expect(gradient.stops![2] - gradient.stops![0], lessThanOrEqualTo(0.25));
     }
   });
 }