Readymade window is very small on high res displays

[Owen-sz]

This is what the window looks like on a 4K Chromebook

[linear]

FYRA-422

[madonuko]

The resolution is hardcoded here:

readymade/src/main.rs

Line 122 in d65638a

set_default_width: 550,

We should detect the screen resolution, scaling, etc. to dynamically set the width & height.