[feature] swap targets in app version comparison UI

when comparing versions, the colors depend on the direction of the comparison, i.e., new changes are green and modified code is red.

For example, I just accidentally compared v1.9.1 on the left to 1.9.0 on the right, and took me a minute to realize someone didn't overwrite changes, they are just reversed -- a swap button would be nice here.

gitlab has this feature for code comparisons: