Fixed error add bookmarks

lib/screens/bookmarks/provider/bookmark_form.provider.dart

@@ -139,7 +139,7 @@ class BookmarkForm extends _$BookmarkForm {
       ref.read(bookmarksProvider.notifier).refresh();
       ref.watch(routerProvider).pop();
       showSnackbar(
-        key: ScaffoldMessengerKeys.root,
+        key: ScaffoldMessengerKeys.bookmarks,
         label: t.bookmarks.addBookmark.bookmarkSavedSuccessfully,
         color: Colors.green,
       );

lib/services/api_client.dart

@@ -171,7 +171,10 @@ class ApiClientService {
         "/bookmarks/",
         data: FormData.fromMap(bookmark.toJson()),
       );
-      if (response.statusCode != 200) {
+      if (response.statusCode == null) {
+        return const ApiResponse(successful: false);
+      }
+      if (response.statusCode! >= 400) {
         return const ApiResponse(successful: false);
       }
       return ApiResponse(