Deal sensibly with large distances

[Andreya-Autumn]

Presently, if you take a few steps in any direction, the mapped region simply wanders offscreen. Not great. My present plan for how to deal with it is:

Once you've stepped far enough away, the UI re-centers on your new location, and the nearest unison vector becomes the new 1/1 (in name only, tuning doesn't change of course). There should then be a note in the corner somewhere clarifying that it's actually 1/1 + however many dieses or commas you've offset by. Like an "enharmonic change" of sorts, but without tempering. Just renaming the notes to keep things readable. And probably more intuitively connected to how the music feels. "This is still our tonic, but it's drifted a little", kinda.