Production control note
Can I revise seating without uploading the guest list?
Yes. A static browser workroom can parse a bounded roster, store the project in IndexedDB, compare proofs, render print HTML, and generate checkpoints and ZIP packets locally, then reopen offline after the shell is cached in supported browsers.
Hosted use still contacts a host
Downloading the application shell is a network interaction even when guest data never becomes a request body. Preserve the owner’s authoritative source outside the browser project and label every assumption that remains unverified.
Offline does not mean durable
Browser storage can disappear. Preserve tested checkpoints and the original authoritative roster. Review the result as production evidence, not as a recommendation or professional approval; the responsible people remain accountable for the decision.
Check every target browser
Service-worker behavior, private browsing, storage quota, print rendering, and download handling vary across browsers and devices. Carry this limitation into the proof and handoff so a fresh recipient knows what changed, what was checked, and what still requires human confirmation.