Please think about how this can be set up to track upstream Kicad. Hopefully you have a small adaptation layer and some clever build, not wholesale changes to the code.

I teach HS classes where a lot of students end up doing some pretty serious PCB layout. We already benefit from MCAD that runs in the browser-- KiCad running in the browser would be a major boon to reduce setup requirements for student computers.

Thinking about how this could play with revision control and KiCad documents (footprint/symbol library, schematic, board, production gerbers) in Git repositories would be really helpful for my use case, too.

Congratulations- this looks really slick!