feat(player): 新增卡片式播放器

test/widget_test.dart

@@ -184,7 +184,7 @@ void main() {
 
       await tester.tap(find.byKey(const Key('drawer-open-series')));
       await tester.pumpAndSettle();
-      expect(find.text('Watch episode 1'), findsOneWidget);
+      expect(find.byKey(const Key('detail-cta')), findsOneWidget);
       await tester.binding.handlePopRoute();
       await tester.pumpAndSettle();
       expect(
@@ -445,8 +445,11 @@ void main() {
       expect(find.byType(Slider), findsOneWidget);
       await tester.drag(find.byType(PageView), const Offset(0, -550));
       await tester.pumpAndSettle();
-      expect(find.text('Episode 2 · Playing now'), findsOneWidget);
-      expect(find.text('City Lights & Velvet Nights'), findsWidgets);
+      expect(
+        tester.widget<Text>(find.byKey(const Key('player-title'))).data,
+        contains('Episode 2'),
+      );
+      expect(find.textContaining('City Lights & Velvet Nights'), findsWidgets);
     },
   );
 
@@ -654,7 +657,7 @@ void main() {
       expect(find.text('City Lights & Velvet Nights'), findsWidgets);
       await tester.tap(find.text('The Signal'));
       await tester.pumpAndSettle();
-      expect(find.text('Watch episode 1'), findsOneWidget);
+      expect(find.byKey(const Key('detail-cta')), findsOneWidget);
     },
   );
 }