Support foldables

[kelna]

It helps a lot that landscape mode can be adjusted separately, but original landscape and unfolded are two very different screen sizes and aspect ratios. If I set it up for unfolded to be usable (eg. 30%), then landscape becomes almost unusable.

[Validbit]

Basically having two different values for global keyboard settings (similar to one-handed mode; landscape, landscape-oh + portrait, portrait-oh) that could be switched as a key on keyboard would do the job i think (if fold detection isn't easy currently).

Could be also related to floating mode - but for users who don't use it, a separate key would help (to only switch the config, e.g. portait on unfolded phone with case or make it easy for one-handed use).