message: feat(popper): add design token
diff: @@ -51,8 +51,8 @@ export const Popper = forwardRef<HTMLDivElement | null, PopperProps>(
  },
  ref
  ) => {
  - const [transitionVisible, setTransitionVisible] = useState(false)
  - const [transitionExisted, setTransitionExisted] = useState(true)
  + const [transitionVisible, setTransitionVisible] = useState(visible)
  + const [transitionExisted, setTransitionExisted] = useState(!transitionVisible)
  useEffect(() => {
  setTransitionVisible(visible)
  @@ -107,6 +107,8 @@ export const Popper = forwardRef<HTMLDivElement | null, PopperProps>(
  <CSSTransition
  classNames={`${prefixCls}--motion`}
  in={transitionVisible}
  + appear
  + // @DesignToken
  timeout={201}
  mountOnEnter={!preload}
  unmountOnExit={unmountOnClose}
  