message: feat(FormField): add before prop; refactor comment
diff: border-radius: inherit;
  }
  +.FormField__before,
  .FormField__after {
  flex-shrink: 0;
  position: relative;
  z-index: 2;
  }
  +.FormField__before {
  + color: var(--vkui--color_icon_accent);
  +}
  +
  +.FormField__after {
  + color: var(--icon_secondary, var(--vkui--color_icon_secondary));
  +}
  +
  .ChipsInput .FormField__after {
  z-index: 3;
  }
  /**
  * sizeY COMPACT
  */
  +.FormField--sizeY-compact .FormField__before,
  .FormField--sizeY-compact .FormField__after {
  min-width: 36px;
  height: 36px;
  