fixed error on pdf viewer transition

lib/view/pages/ticker/widgets/ticker_page_body.dart

@@ -17,6 +17,7 @@ import '../../../../theming/app_theme.dart';
 import '../../../../widget/app_progress_indicator.dart';
 import '../../../../widget/placeholder_view.dart';
 import '../../../../widget/prosemirror/pm_json_view.dart';
+import '../../../../widget/route_transition_gate.dart';
 import 'ticker_content_card.dart';
 import 'ticker_updated_bar.dart';
 
@@ -187,7 +188,9 @@ class _ProxiedFileViewState extends State<_ProxiedFileView> {
           text: 'Das Dokument konnte nicht geladen werden.',
         );
       }
-      return SfPdfViewer.memory(bytes);
+      return RouteTransitionGate(
+        builder: (context) => SfPdfViewer.memory(bytes),
+      );
     },
   );
 }