feat: combine power and workout controls

[morteako]

Since they both are small, I think it is easiest to just combine them. Current solution makes it a bit hard to remember which one to click and such. Could ofc be solved another way (different icons). But I think this is an easier solution both for us and users.

One could then delete one of the buttons, but I just kept both, since it is so symmetric :))

[sivertschou]

Hmm I kinda agree that it might be a bit difficult to remember/understand which button is which, since the icons are the same, but I think I would prefer doing something about that rather than forcing both sections to always be displayed together.

I'll try to come up with a suggestion. We could probably add some text making it easier to understand that the right side is related to power and the left is related to workouts, but that might end up making the base look worse?