Ensure primary action menu doesn't fall offscreen on small viewports #11963
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Description
Makes
![Screenshot of category index screen on a small viewport; the 'New category' button stretches so that the disclosure trigger is aligned with the right side of the screen](https://user-images.githubusercontent.com/17525979/190782005-9cabdc6d-820b-4aeb-b3fe-b1a24397ea79.png)
.btngroup
span width of screen on smaller viewports, ensuring right alignment doesn't cause an overflowRelated issues