Add a popover toggle for exercise names

[LiamMorrow]

Fixes: #241

This PR adds a popover which can be shown by tapping an exercise name to show the full name.

I'm gonna hold off on merging this for a little. It's a good starting point, but I don't love it and I'm certain it breaks on all but the most updated devices since it uses the popover api with no fallback :(

https://github.com/user-attachments/assets/39f7a6f4-6d75-4a8e-b849-038cea16eab9