message: Bug Use buttons for perspective switcher dropdown items
  This is better for accessibility and prevents an "Open in New Window"
  context menu item, which won't work.
diff: @@ -72,7 +72,7 @@ const NavHeader_: React.FC<NavHeaderProps & StateProps> = ({
  onPerspectiveSelect(event, nextPerspective)
  }
  isHovered={nextPerspective.properties.id === activePerspective}
  - href="#"
  + component="button"
  >
  <Title size="md">
  <span className="oc-nav-header__icon">{nextPerspective.properties.icon}</span>
  