copy-dist.mjs rm -rf'd internal/webui/dist before copying the SPA in, so
every npm run build deleted the committed .gitkeep and a fresh checkout
went back to failing go:embed. Restore the placeholder after the copy, and
also on a failed copy (an empty dist/ still compiles; a missing dir does
not), so the wipe only ever clears build output.
AskaEth
Aska