fix(flutter): 修复首页冷启动灰屏

lib/pages/player/player_view.dart

@@ -300,6 +300,11 @@ class _PlayerPageState extends State<PlayerPage> with WidgetsBindingObserver {
     return Stack(
       fit: StackFit.expand,
       children: [
+        if (widget.homeMode)
+          const ColoredBox(
+            key: Key('home-feed-black-background'),
+            color: Colors.black,
+          ),
         if (!ready) _PlayerFallbackBackground(posterUrl: drama.posterUrl),
         ?video,
         if (widget.homeMode && _chromeVisible && !logic.chromeHidden)
@@ -580,10 +585,11 @@ class _PlayerFallbackBackground extends StatelessWidget {
           posterUrl,
           key: const Key('player-fallback-cover'),
           fit: BoxFit.cover,
+          fallbackColor: Colors.black,
         ),
         const ColoredBox(
           key: Key('player-fallback-scrim'),
-          color: Color(0x66000000),
+          color: Color(0x4D000000),
         ),
       ],
     );