Build & Deploy (Nix) / build-and-deploy (push) Successful in 54s
handleHome looked up `${import.meta.dir}/home.html` which exists in neither
layout: dev (src/interfaces/http/controllers/) nor prod bundle
($out/share/teleuploader/dist/ — flake copies home.html beside dist/).
Add resolveHomeHtml(): walk up from import.meta.dir (bounded) to find
home.html. Works for dev (src/home.html, 4 levels up) and prod
(../home.html, 1 level up). Fails fast with a clear error instead of a
bare ENOENT 500. Tests cover both layouts + not-found fallback.
