New designs by @AAlhazwani-WMF:
| {F65745831} | {F65745849} | {F65745998} | {F65746137}
| When no 2FA methods are set up | Success message after setting up a 2FA method | With two methods set up | Expanded accordion
[ ] Remove existing UI with separate "Enable" buttons for TOTP and WebAuthn
[ ] Add a "Two-factor authentication" section on Special:Authentication (see T401771) which lists all registered 2FA methods as accordions
[ ] Each accordion contains the name and type of the method in its title (shown when collapsed)
[ ] When expanded, each accordion displays the creation timestamp, and "Rename" and "Delete" buttons (see also {T401775})
[ ] At the bottom of this section, add a MenuButton labeled "Add new method" that drops down to two options for TOTP and WebAuthn (note that the design shows a non-quiet MenuButton but that's not supported by Codex; we're still working out that detail)
[ ] When a new 2FA method is added, or a method is removed, a success message should be displayed