Fix UserNameDialog open error and add defensive ref check

- Added ref="userNameDialog" to UserNameDialog in AccountViewView.vue template
- Patched onEditName() to check for dialog ref and open() method before calling
- Improved error notification to use NotificationIface fields (group, type, title, text)
- Prevents "Cannot read properties of undefined (reading 'open')" error if dialog is missing

src/composables/useNotifications.ts

@@ -95,4 +95,3 @@ export function useNotifications() {
     downloadStarted,
   };
 }
-