* feat(oauth): add browser login for Grok Build provider (#7013)
* feat(oauth): grok-build supports device_code AND browser-PKCE side-by-side (#7013)
Reworks #7735 so the browser PKCE login is added ALONGSIDE the device_code flow
(#7358) instead of replacing it; the OAuthModal lets the user pick either method.
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
