demo.spec.ts, ui-redesign.spec.ts and interactive-elements.spec.ts all
hardcoded an absolute http://localhost:8128 base for their demo-reset
helpers, which silently pointed at the local dev API even when the suite
was pointed at a different target via MOBILITYOPS_PUBLIC_URL -- discovered
while running the suite against the actual Unraid deployment, where the
reset call kept hitting the local machine instead of the server and left
BK-DEMO-RETURN in whatever state a prior run had left it. Use relative
paths so the request fixture's configured baseURL is honoured everywhere.