- Use verification_uri_complete from the xAI device-code response so the
login link opens with the user code prefilled (https-validated)
- Add OAuthAuth.loginLabel and show "Sign in with SuperGrok or X Premium"
in the xAI auth-type selector (threaded through lazyOAuth)
- Remove grok-3, grok-3-fast, grok-4.20 variants and grok-code-fast-1
from the built-in xAI catalog and default to grok-4.5
Co-authored-by: Jaaneek <Jaaneek@users.noreply.github.com>