add success message to add patient, edit patient,patient notes, patient files.

update note and file view to match UI.
restrict file types in file uploud.
add image viewer

Frontend/patient_manager/pubspec.yaml

@@ -36,6 +36,7 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
   syncfusion_flutter_pdfviewer: ^26.1.39
+  universal_html: ^2.2.4
   file_picker: ^8.0.5
   supabase_auth_ui: ^0.4.1
   supabase_flutter: ^2.4.0