Invalidate a question's review status when the question is edited

Form: show full review history across all versions (not just loaded one)

Per-question reviews; render questionnaire in app layout

Reviewer sees review history across all versions

Admin shows only the latest version per trial

Show reviews when retrieving a version

Save every submit as a new version; let users pick a version to load

Make submissions editable; load by trial_id + username

Store each review as a separate file under reviews/<submission>/

Support multiple reviews per submission with full history

Add Streamlit/HF-Space version; move Next.js code into legacy/