Function admin_login_page 

pub fn admin_login_page(
    bad: Option<bool>,
    next: Option<String>,
    webauthn: &State<Option<WebauthnState>>,
) -> Template

The sign-in page (GET /admin/login?<bad>&<next>): a form to enter an admin token, plus a “sign in with a passkey” affordance when passkeys are enabled. ?bad=true flags a failed previous attempt; ?next= is the destination to return to after signing in (carried through the form).