message: fix(Picker): ensure title align in center
diff: user-select: none;
  &__toolbar {
  + position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  }
  &__title {
  + position: absolute;
  + left: 50%;
  color: var(--van-text-color);
  max-width: 50%;
  font-weight: var(--van-font-bold);
  font-size: var(--van-picker-title-font-size);
  line-height: var(--van-picker-title-line-height);
  text-align: center;
  + transform: translateX(-50%);
  }
  &__columns {
  