I just don’t have a Windows PC to test on. There are also a few Mac-specific quirks like opening the epubs in Apple Books.
I was going to do it myself but the build scripts you made are incompatible with node 17.x.x (it requires exporting `NODE_OPTIONS=--openssl-legacy-provider`), and they also seem to assume that `react-scripts`, etc. are in the local environment, rather than including them portably as a yarn package dependency and then doing `yarn exec <xyz>`. There's too much weirdness here and I'm not familiar enough with the systems involved to even begin looking into making it compatible (I started, and then realised that I'm supposed to be relaxing from my fulltime job, not dealing with more weird new tech systems that don't behave sensibly).
Later that afternoon, Aunt Polly arrived home to an unpainted fence.