feat(player): 未就绪改由进度条展示加载态

lib/pages/player/widgets/player_video_surface.dart

@@ -4,25 +4,21 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:video_player/video_player.dart';
 
-import '../../../core/widgets/remote_image.dart';
-
 const Duration _videoFadeDuration = Duration(milliseconds: 200);
 const double _errorHorizontal = 32;
 const int _errorMaxLines = 3;
 
-/// 封面底层与视频层共用同一控制器，视频首帧就绪后再淡入。
+/// 黑色底层与视频层共用同一控制器，视频首帧就绪后再淡入。
 class PlayerVideoSurface extends StatefulWidget {
   const PlayerVideoSurface({
     super.key,
     required this.controller,
-    required this.posterUrl,
     required this.videoUrl,
     required this.theater,
     required this.onTap,
   });
 
   final VideoPlayerController? controller;
-  final String posterUrl;
   final String videoUrl;
   final bool theater;
   final VoidCallback onTap;
@@ -57,7 +53,10 @@ class _PlayerVideoSurfaceState extends State<PlayerVideoSurface> {
     return Stack(
       fit: StackFit.expand,
       children: [
-        _FallbackBackground(posterUrl: widget.posterUrl),
+        const ColoredBox(
+          key: Key('player-fallback-background'),
+          color: Colors.black,
+        ),
         AnimatedOpacity(
           key: const Key('player-video-opacity'),
           opacity: reveal ? 1 : 0,
@@ -164,35 +163,3 @@ class _VideoLayer extends StatelessWidget {
     );
   }
 }
-
-class _FallbackBackground extends StatelessWidget {
-  const _FallbackBackground({required this.posterUrl});
-
-  final String posterUrl;
-
-  @override
-  Widget build(BuildContext context) {
-    if (posterUrl.trim().isEmpty) {
-      return const ColoredBox(
-        key: Key('player-fallback-background'),
-        color: Colors.black,
-      );
-    }
-    return Stack(
-      key: const Key('player-fallback-background'),
-      fit: StackFit.expand,
-      children: [
-        RemoteImage(
-          posterUrl,
-          key: const Key('player-fallback-cover'),
-          fit: BoxFit.cover,
-          fallbackColor: Colors.black,
-        ),
-        const ColoredBox(
-          key: Key('player-fallback-scrim'),
-          color: Color(0x4D000000),
-        ),
-      ],
-    );
-  }
-}