message: ListItem: added link mode; small CSS refactoring of expandable mode for iOS; moved onClick handler from li to Tappable
diff: display: flex;
  max-width: 100%;
  overflow: hidden;
  + text-decoration: none;
  }
  .ListItem__checkbox {
  text-overflow: ellipsis;
  max-width: 100%;
  align-self: center;
  + color: #000;
  }
  .ListItem--multiline .ListItem__main {
  }
  .List--ios .ListItem__chevron {
  - position: absolute;
  - right: 10px;
  - top: 50%;
  - margin-top: -12px;
  color: var(--separator)
  }
  transition: transform .6s var(--ios-easing);
  }
  - .ListItem--ios.ListItem--expandable .ListItem__in {
  - padding: 0 35px 0 12px;
  - }
  -
  .ListItem--ios:not(:last-child) .ListItem__in:not(.Tappable--active) .ListItem__before::before {
  position: absolute;
  bottom: 0;
  