[MVC] Counter dark mode hover/focus styles
The `<counter>` component in the super sidebar does not have styles for `:hover`/`:focus`/`:active` states in dark mode.
| Default | Hover |
| ------ | ----- |
|  |  |
Figma design:

https://www.figma.com/file/kAAMkIqKPE4rRYo1JQIheI/Navigation-Redesign?node-id=3206%3A180669&t=coKLpAca8nhFPXAp-4
issue