One-line: a bordered card rail that holds ghost Buttons and Toggles, split into groups by a hairline separator.

```jsx
<Toolbar>
  <ToolbarGroup><Toggle aria-label="Bold"><BoldIcon /></Toggle><Toggle aria-label="Italic"><ItalicIcon /></Toggle></ToolbarGroup>
  <ToolbarSeparator />
  <ToolbarGroup><Button variant="ghost" size="icon-sm"><LinkIcon /></Button></ToolbarGroup>
</Toolbar>
```
