update viewer impl

pubspec.yaml

@@ -87,7 +87,7 @@ dependencies:
   flutter_secure_storage: ^9.0.0
   sliver_tools: ^0.2.10
   webview_flutter: ^4.2.1
-  printing: ^5.11.0
+  printing: ^5.11.1
   go_router: ^13.0.1
   fl_chart: ^0.66.0
   palette_generator: ^0.3.3+2
@@ -107,7 +107,7 @@ dependencies:
       ref: '4be9de9ffed5398fd7d5f44bbb07dcd3d3f1711b'
       path: packages/pdfx
   markdown: ^7.1.1
-  pdfrx: ^0.4.3
+  pdfrx: ^0.4.6
 
 dependency_overrides:
   intl: ^0.18.1
@@ -158,6 +158,7 @@ flutter:
     - test/fixtures/preview/
     - test/fixtures/document_types/
     - assets/changelogs/
+    - assets/example/
 
   fonts:
     - family: RobotoMono