Add support for fold

[aidancz]

require('go‑up').centerScreen() does not work when there's a fold

demo:

20250113-134300-286704077.mp4

[nullromo]

Thank you for the issue report. Since I don't use folding much, I didn't catch this. It might take me a little while to get to this one, since I'm a little busy at the moment, but I'll try to address this soon.