message: feat(breadcrumb): improve styles
diff: line-height: var(--typography-body-letter);
  :root & > * {
  - &a:hover {
  - text-decoration: underline;
  - }
  + text-decoration: none;
  }
  &:not(:last-child) {
  margin-left: var(--space-xs);
  margin-right: var(--space-xs);
  }
  +
  + :root & > a {
  + &:hover {
  + text-decoration: underline;
  + }
  + }
  }
  &:last-child {
  :root & > * {
  cursor: default;
  font-weight: 600;
  + }
  +
  + :root & > a {
  + &:hover {
  text-decoration: none;
  }
  }
  }
  +}
  .default {
  .breadcrumbItem {
  