OnceHub?

Build a focused replacement for OnceHub for an independent professional booking one type of appointment, based on this public product description: “Smart Scheduling Solutions | Booking Pages | OnceHub — Generic scheduling pages weaken your first impression and trust. OnceHub Booking Pages deliver a personalized experience that converts visitors into meetings.” Do not copy the original brand, proprietary assets, name, logo, UI, or copy; create an original visual system.

Core workflow
- Recreate only the narrow primary workflow described above, with define availability, timezone, duration, buffer, and booking questions; show a public booking page with conflict-safe reservation; send or display confirmation and cancellation state; include calendar-provider adapter boundaries and exportable bookings.
- Keep the product name and source description in a research note in the README, and turn every uncertain behavior into an explicit assumption or user setting rather than inventing a feature.
- Use a small React/TypeScript app with a portable JSON or SQLite data model, clear loading/empty/error states, and adapters around external services. Seed realistic demo data so the complete workflow works without paid credentials.

Scope boundaries
- Out of scope for v1: multi-provider enterprise scheduling; payments and complex routing; guaranteed calendar consistency without a provider. Do not promise feature parity, proprietary data, or enterprise reliability.

Include a README with setup, environment variables, data model, implementation decisions, privacy behavior, testing instructions, and important limitations.