Revert "merge: 合并 K95.2 首切频道封面过渡"

This reverts commit a2a491d056, reversing
changes made to 838ca2ce2a.

lib/pages/player/player_view.dart

@@ -378,7 +378,6 @@ class _PlayerPageState extends State<PlayerPage>
         PlayerVideoSurface(
           controller: videoPort?.controller,
           videoUrl: videoPort?.controller.dataSource ?? episode.videoUrl,
-          posterUrl: drama.posterUrl,
           theater: theater,
           onTap: () =>
               logic.session.setUserWantsPlay(!logic.session.userWantsPlay),
@@ -428,7 +427,7 @@ class _PlayerPageState extends State<PlayerPage>
               ),
             ),
           ),
-        if (selected && logic.session.loading && !widget.homeMode)
+        if (selected && logic.session.loading)
           const Center(
             child: CircularProgressIndicator(
               key: Key('player-session-loading'),

lib/pages/player/widgets/player_video_surface.dart

@@ -4,26 +4,22 @@ 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;
 
-/// 封面或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。
+/// 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.videoUrl,
-    this.posterUrl = '',
     required this.theater,
     required this.onTap,
   });
 
   final VideoPlayerController? controller;
   final String videoUrl;
-  final String posterUrl;
   final bool theater;
   final VoidCallback onTap;
 
@@ -57,17 +53,10 @@ class _PlayerVideoSurfaceState extends State<PlayerVideoSurface> {
     return Stack(
       fit: StackFit.expand,
       children: [
-        if (widget.posterUrl.isEmpty)
-          const ColoredBox(
-            key: Key('player-fallback-background'),
-            color: Colors.black,
-          )
-        else
-          RemoteImage(
-            widget.posterUrl,
-            key: const Key('player-video-poster'),
-            fit: BoxFit.cover,
-          ),
+        const ColoredBox(
+          key: Key('player-fallback-background'),
+          color: Colors.black,
+        ),
         AnimatedOpacity(
           key: const Key('player-video-opacity'),
           opacity: reveal ? 1 : 0,