btmxh

I just got some basic Typst exporting support in my [fork](https://github.com/btmxh/quiver), but it's pretty limited atm (no support for >= 2-cells, labels have to be written in Typst, some arrow...

Personally, I think letting `node()` and `edge()` return a handle to the node/edge as a variable is a good alternative for having names, i.e. ```typ #fletcher.diagram(spacing: 2cm, { let A...

Adding something like ```[[spirv::noflat]]``` would be helpful