Add an option to display uncropped images at full width as long as they're not too tall
Currently, when you set Pleroma-FE to display gallery images uncropped, it still fits them into the same landscape-aspect box and just shrinks and letterboxes them to fit. It'd be good to add an option to display uncropped images at full width, and only letterbox them if they're taller than 1:3 or something.