refactor: remove unused convenience APIs

lib/utils/media_image_helper.dart

@@ -275,15 +275,6 @@ class MediaImageHelper {
     return true;
   }
 
-  /// Optimized URL for hero/background art ([ImageType.art]).
-  static String heroArtUrl({
-    required MediaServerClient? client,
-    required String? thumbPath,
-    required BuildContext context,
-    required double containerWidth,
-    required double containerHeight,
-  }) => _typedUrl(client, thumbPath, context, containerWidth, containerHeight, ImageType.art);
-
   /// Optimized URL for clear-logo overlays ([ImageType.logo]).
   static String logoUrl({
     required MediaServerClient? client,

lib/utils/media_server_http_client.dart

@@ -249,9 +249,6 @@ class MediaServerHttpClient {
     }
   }
 
-  /// Send a streamed request (for image cache etc).
-  Future<http.StreamedResponse> sendStreamed(http.BaseRequest request) => _client.send(request);
-
   void close() {
     _closing = true;
     _abortActiveRequests();