- Added 'Registrarse con Google' button at the top of the register form
- Same googleLogin endpoint as login — backend auto-creates account if new user
- Logs analytics event sign_up with method:'google'
- Redirects to /map (or role-based route) immediately after registration
- Divider 'o con correo' separates Google from the manual form
- Identical button style to LoginForm for visual consistency
- Error message shown inline if Google auth fails