First (somewhat) working version

The UI is usable and you can draw boxes, but text and Latex support is still work in progress, ipelets don't work and opening some dialogues leads to segfaults. See the notes on running Qt6 WebAssembly code here and the blue box at the top of this site, so you need a (local) webserver that sets the right HTTP headers (e.g. qtwasmserver.py) and cannot directly open the .html file.