fix(player): 预热直出并与视频统一封面布局

lib/pages/player/widgets/player_opening_frame.dart

@@ -12,17 +12,19 @@ import '../../../core/theme/app_colors.dart';
 import '../../../core/widgets/remote_image.dart';
 import 'scrub_preview_card.dart';
 
-const double _posterAspectRatio = 3 / 4;
-const double _posterBlurSigma = 18;
-
 /// 封面立即可见，雪碧图首帧解码完成后再覆盖封面。
-Widget? playerOpeningFrame(String? thumbnailsUrl, {String? posterUrl}) {
+Widget? playerOpeningFrame(
+  String? thumbnailsUrl, {
+  String? posterUrl,
+  BoxFit fit = BoxFit.cover,
+}) {
   final url = thumbnailsUrl?.trim() ?? '';
   final poster = posterUrl?.trim() ?? '';
   if (url.isEmpty && poster.isEmpty) return null;
   return PlayerOpeningFrame(
     thumbnailsUrl: url.isEmpty ? null : url,
     posterUrl: poster.isEmpty ? null : poster,
+    fit: fit,
   );
 }
 
@@ -32,12 +34,14 @@ class PlayerOpeningFrame extends StatefulWidget {
     super.key,
     this.thumbnailsUrl,
     this.posterUrl,
+    this.fit = BoxFit.cover,
     this.loader,
     this.cache,
   });
 
   final String? thumbnailsUrl;
   final String? posterUrl;
+  final BoxFit fit;
   final SpriteThumbnailAssetLoader? loader;
   final OpeningFrameCache? cache;
 
@@ -85,39 +89,18 @@ class _PlayerOpeningFrameState extends State<PlayerOpeningFrame> {
       children: [
         const ColoredBox(color: AppColors.mediaBlack),
         if (posterUrl != null)
-          Positioned.fill(
-            child: ImageFiltered(
-              key: const Key('player-opening-poster-blur'),
-              imageFilter: ui.ImageFilter.blur(
-                sigmaX: _posterBlurSigma,
-                sigmaY: _posterBlurSigma,
-              ),
-              child: RemoteImage(
-                posterUrl,
-                key: const Key('player-opening-poster-backdrop'),
-                fit: BoxFit.cover,
-                fallbackColor: AppColors.mediaBlack,
-              ),
-            ),
-          ),
-        if (posterUrl != null)
-          Center(
-            child: AspectRatio(
-              key: const Key('player-opening-poster-stage'),
-              aspectRatio: _posterAspectRatio,
-              child: RemoteImage(
-                posterUrl,
-                key: const Key('player-opening-poster'),
-                fit: BoxFit.cover,
-                fallbackColor: AppColors.mediaBlack,
-              ),
-            ),
+          RemoteImage(
+            posterUrl,
+            key: const Key('player-opening-poster'),
+            fit: widget.fit,
+            fallbackColor: AppColors.mediaBlack,
           ),
         if (frame != null)
           SpriteCropPreview(
             key: const Key('player-opening-sprite'),
             image: frame.image,
             sourceRect: frame.sourceRect,
+            fit: widget.fit,
           ),
       ],
     );