scale icons

[dchinmay2]

fixes #21

[dchinmay2]

re: the title/commit message, not sure if it scales only the icons or the whole thing, nevertheless it seems to fix the blurriness

[dchinmay2]

there's also https://gtk-rs.org/gtk4-rs/stable/latest/docs/gdk4/prelude/trait.SurfaceExt.html#method.scale which doesn't round up fractional scales but it also made things blurry on my 1.5x scaled display

[AMNatty]

This approach scales the surface used for the rasterization of the SVG so this should work fine

[dchinmay2]

yeah SVGs being blurry on scaled monitors had only one obvious explanation - they were being concretized at a lower resolution and then scaled later, so I just looked where the numbers were in the code

TIL that SVG concretization is called rasterization, thanks