Customize /activate endpoint in device authorization flow

Feature: Customize HTML in the /activate endpoint in device flow.

Description: We’d like to customize the /activate endpoint when typing in a code in the browser after receiving a code from another device in terms of styling and maybe even the input field. We also would want a way to add an option to redirect users back to our web platform would also be helpful. If possible, an option to automatically add a hyphen in the middle of the auth code would be beneficial.

Use-case: The user experience would generally be improved by giving more options to users, and make the input field more readable.

Thanks for the detailed feature request!