message: use vkui-tokens for Header paddings
diff: display: flex;
  align-items: baseline;
  justify-content: space-between;
  - padding: 0 16px;
  + padding: 0;
  + padding-left: var(--vkui--size_base_padding_horizontal--regular);
  + padding-right: var(--vkui--size_base_padding_horizontal--regular);
  user-select: text;
  }
  /**
  * iOS
  */
  -.Header--ios {
  - padding: 0 12px;
  -}
  .Header--ios .Header__main {
  margin: 13px 0 9px;
  