• Add label to settings cogwheel.
  

• Add auto focus to the popup and hide background from tab order - Check if this can be fixed with focus trap in OOUI.
  

• Allow closing the settings dialog via ESC or tabbing to the X
  

• Check duplicate aria role
  

• Make focus on selected checkbox visible (find out why the standard OOUI - white outline - is not applied here)
  

Open questions

• Should we make the settings cogwheel reachable via keyboard? How?