modificacion de colores en el login

lib/providers/videos_provider.dart

@@ -580,6 +580,57 @@ class VideosProvider extends ChangeNotifier {
     }
   }
 
+  /// Delete video poster only (not the video itself)
+  Future<bool> deletePoster(int mediaFileId) async {
+    try {
+      isLoading = true;
+      notifyListeners();
+
+      // Get current metadata
+      final response = await supabaseML
+          .from('media_files')
+          .select('metadata_json')
+          .eq('media_file_id', mediaFileId)
+          .eq('organization_fk', organizationId)
+          .single();
+
+      final metadata = response['metadata_json'] as Map<String, dynamic>? ?? {};
+      final posterUrl = metadata['poster_url'] as String?;
+
+      // Delete poster from storage if exists
+      if (posterUrl != null && posterUrl.isNotEmpty) {
+        try {
+          final uri = Uri.parse(posterUrl);
+          final pathSegments = uri.pathSegments;
+          final bucketIndex = pathSegments.indexOf('energymedia');
+          if (bucketIndex != -1 && bucketIndex < pathSegments.length - 1) {
+            final posterPath = pathSegments.sublist(bucketIndex + 1).join('/');
+            await supabaseML.storage.from('energymedia').remove([posterPath]);
+          }
+        } catch (e) {
+          print('Error eliminando poster del storage: $e');
+        }
+      }
+
+      // Remove poster references from metadata
+      metadata.remove('poster_url');
+      metadata.remove('poster_file_name');
+
+      // Update metadata
+      await updateVideoMetadata(mediaFileId, metadata);
+
+      isLoading = false;
+      notifyListeners();
+      return true;
+    } catch (e) {
+      errorMessage = 'Error eliminando portada: $e';
+      isLoading = false;
+      notifyListeners();
+      print('Error en deletePoster: $e');
+      return false;
+    }
+  }
+
   // ========== DELETE METHODS ==========
 
   /// Delete video and its storage files