fix(flutter): 播放页改为透明叠层

test/player/player_fullscreen_test.dart

@@ -187,16 +187,35 @@ void main() {
     final rail = tester.getRect(
       find.byKey(const Key('player-interaction-rail')),
     );
+    expect(find.byKey(const Key('player-background')), findsNothing);
+    final fallback = find.byKey(const Key('player-fallback-background'));
+    if (fallback.evaluate().isNotEmpty) {
+      expect(tester.widget<ColoredBox>(fallback).color, Colors.black);
+    }
     expect(
       tester
-          .widget<ColoredBox>(find.byKey(const Key('player-background')))
+          .widget<Scaffold>(find.byKey(const Key('player-scaffold')))
+          .backgroundColor,
+      Colors.transparent,
+    );
+    expect(
+      tester
+          .widget<Container>(find.byKey(const Key('player-controls-top')))
+          .decoration,
+      isNull,
+    );
+    expect(
+      tester
+          .widget<Padding>(find.byKey(const Key('player-controls-bottom')))
+          .child,
+      isNotNull,
+    );
+    expect(
+      tester
+          .widget<Material>(find.byKey(const Key('player-episodes-pill')))
           .color,
-      AppColors.playerBackground,
+      AppColors.playerOverlayPill,
     );
-    final panel = tester.widget<Container>(
-      find.byKey(const Key('player-controls-bottom')),
-    );
-    expect((panel.decoration! as BoxDecoration).color, AppColors.playerPanel);
 
     expect(bottom.height, lessThanOrEqualTo(200));
     expect(bottom.top, greaterThanOrEqualTo(screenHeight * 0.78));