add userFriendly messages to PermissionsException (#13659)

/closes #13580

<img width="1186" height="754" alt="image"
src="https://github.com/user-attachments/assets/d5be9e3a-2748-4ad0-b29b-98038cbeeb6a"
/>

packages/twenty-server/src/engine/core-modules/user/services/user.service.ts

@@ -122,6 +122,10 @@ export class UserService extends TypeOrmQueryService<User> {
               throw new PermissionsException(
                 PermissionsExceptionMessage.CANNOT_DELETE_LAST_ADMIN_USER,
                 PermissionsExceptionCode.CANNOT_DELETE_LAST_ADMIN_USER,
+                {
+                  userFriendlyMessage:
+                    'Cannot delete account: you are the only admin. Assign another admin or delete the workspace(s) first.',
+                },
               );
             }
             throw error;