feat(media): 图片占位改为纯色块并去掉扫光

lib/pages/home/widgets/home_drama_grid.dart

@@ -122,7 +122,6 @@ class HomeDramaCard extends StatelessWidget {
             drama.posterUrl,
             width: double.infinity,
             fit: BoxFit.fitWidth,
-            showFallbackIcon: true,
             fallbackAspectRatio: _coverAspectRatio,
           ),
           Positioned(top: 8, left: 8, child: _tagBadge()),
@@ -226,7 +225,9 @@ class HomeDramaCard extends StatelessWidget {
   }
 
   Widget _genre(BuildContext context) {
-    final labels = drama.localizedTypeLabels(Localizations.localeOf(context).languageCode);
+    final labels = drama.localizedTypeLabels(
+      Localizations.localeOf(context).languageCode,
+    );
     final genre = labels.isEmpty
         ? (drama.genre.isEmpty ? drama.category : drama.genre)
         : labels.join(' / ');

lib/pages/home/widgets/home_feed_card.dart

@@ -12,11 +12,7 @@ import '../../../core/widgets/remote_image.dart';
 final RegExp _tagSplitter = RegExp(r'[,/、·]');
 
 class HomeFeedCard extends StatelessWidget {
-  const HomeFeedCard({
-    super.key,
-    required this.drama,
-    required this.onTap,
-  });
+  const HomeFeedCard({super.key, required this.drama, required this.onTap});
 
   final Drama drama;
   final VoidCallback onTap;
@@ -44,7 +40,9 @@ class HomeFeedCard extends StatelessWidget {
                   mainAxisAlignment: MainAxisAlignment.start,
                   children: [
                     Text(
-                      drama.localizedTitle(Localizations.localeOf(context).languageCode),
+                      drama.localizedTitle(
+                        Localizations.localeOf(context).languageCode,
+                      ),
                       key: Key('home-feed-title-${drama.id}'),
                       maxLines: 2,
                       overflow: TextOverflow.ellipsis,
@@ -69,7 +67,9 @@ class HomeFeedCard extends StatelessWidget {
   }
 
   Widget _cover(BuildContext context) {
-    final label = drama.localizedTag(Localizations.localeOf(context).languageCode);
+    final label = drama.localizedTag(
+      Localizations.localeOf(context).languageCode,
+    );
     return ClipRRect(
       key: Key('home-feed-cover-clip-${drama.id}'),
       borderRadius: BorderRadius.circular(AppDimens.cardCoverRadius),
@@ -82,7 +82,6 @@ class HomeFeedCard extends StatelessWidget {
               drama.posterUrl,
               key: Key('home-feed-cover-${drama.id}'),
               fit: BoxFit.cover,
-              showFallbackIcon: true,
               fallbackColor: AppColors.contentSurface,
             ),
             if (label.isNotEmpty)
@@ -133,7 +132,9 @@ class HomeFeedCard extends StatelessWidget {
   }
 
   List<String> _cardTags(BuildContext context) {
-    final localized = drama.localizedTypeLabels(Localizations.localeOf(context).languageCode);
+    final localized = drama.localizedTypeLabels(
+      Localizations.localeOf(context).languageCode,
+    );
     if (localized.isNotEmpty) return localized.take(3).toList(growable: false);
     final seen = <String>{};
     return [drama.genre, drama.category]