feat(identity): align auth flow with reference theme

assets/css/routes/user-center/settings.css

@@ -528,20 +528,11 @@
 
 .uc-auth-form { display: grid; gap: 17px; }
 .uc-auth-field { display: grid; gap: 7px; color: var(--color-ink-2); font-size: 13px; font-weight: 600; }
-.uc-auth-enterprise-fields { display: grid; gap: 17px; }
-.uc-auth-enterprise-fields[hidden] { display: none; }
 .uc-auth-form .form-control { width: 100%; min-height: 42px; padding: 9px 11px; border: 1px solid var(--color-line-soft, rgba(15, 23, 42, 0.1)); border-radius: 9px; background: var(--surface-1); color: var(--color-ink); font: inherit; font-weight: 400; box-sizing: border-box; }
 .uc-auth-form textarea.form-control { resize: vertical; }
-.uc-auth-consent { display: flex; align-items: flex-start; gap: 8px; color: var(--color-ink-3); font-size: 13px; font-weight: 400; line-height: 1.6; }
-.uc-auth-consent input { flex: 0 0 auto; margin-top: 3px; }
 .uc-auth-submit { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 44px; }
 .uc-auth-form__message { min-height: 18px; color: var(--color-error, #dc2626); font-size: 12px; text-align: center; }
 
-.uc-auth-pending { text-align: center; padding: 4px 0 18px; }
-.uc-auth-pending > span { display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto 12px; border-radius: 18px; background: rgba(245, 158, 11, 0.14); color: #a66e0b; font-size: 24px; }
-.uc-auth-pending h3 { margin: 0 0 7px; }
-.uc-auth-pending p { margin: 0; color: var(--color-ink-4); font-size: 13px; }
-
 @media (max-width: 640px) {
   .uc-auth-modal__dialog { position: fixed; inset: auto 0 0; width: 100%; max-width: none; max-height: 88vh; margin: 0; border-radius: 18px 18px 0 0; }
 }