Password-manager autofill does not see authentik login fields

## What

password-manager autofill (KeePassXC / Bitwarden / Proton Pass) does not recognize authentik username/password fields on the login/password stage.

## Want

- Password-manager autofill (KeePassXC / Bitwarden / Proton Pass) does not recognize authentik username/password fields on the login/password stage

## Ideas this came from

- [#15265 Better compatibility with KeepassXC](https://github.com/goauthentik/authentik/issues/15265) — In the auth flow when enabling "compatibility mode", login basically works with keepassxc. But UX is still not the best. I have enabled the password phase in th
- [#18982 Bitwarden Auto-Fill no longer appearing on password prompt](https://github.com/goauthentik/authentik/issues/18982) — On the username field, bitwarded detects the field just fine:

Reproduce the login and password stages with KeePassXC, Bitwarden, and Proton Pass, using the linked related issues as context. Trace the authentik login fields involved; done means the listed password managers recognize and autofill both username and password fields.

Written by the indexing model from the issue text.