Open house sign-in + follow-up

Build an iPad-friendly open house sign-in for real estate.

Core features:
1. Public property page with cover
2. Guest sign-in: name, email, phone, buyer/agent
3. Auto follow-up email after 24h with listing details
4. Agent dashboard: leads per open house, export

Data: properties, open_houses, visitors, sends.
Must-haves: works offline then syncs, big tap-friendly form.