Drives the real management UI: seeds a provider carrying extraBody,
extraHeaders and a transformer, opens the edit dialog, saves, and asserts
the three fields are still there afterwards.
The spec fails on the unpatched build and passes with the fix, so it
guards the regression rather than the helper alone.
The CLI web server bootstrap moves out of cli-web.spec.ts into
cli-web-runtime.ts so both specs can start their own instance.
