Even on Linux, Chromium "helps" by mapping `BlinkMacSystemFont` to the
system Helvetica equivalent, "Liberation Sans". But Liberations doesn't
have the 900 font weight that give Fizzy its characteristic chunky look.
Pushing the Gnome deafult, "Adwaita Sans" head of the system fonts for
Mac allows black weight. That's how it worked on Linux until we removed
`system-ui` from the font stack in #2000. This is largely for Omarchy
users, of which most of our developers are, so it seems fair.
Jason Zimdars
b044a4b355