schej-it/timeful.app ? reverse-engineered prompt

Build me a web app like Timeful, where people can create a group availability poll and quickly see the best time to meet.

I want users to be able to make an event, pick a date range and possible time windows, then invite others to mark when they are available. The app should show overlapping availability clearly, let people choose available or if needed, and handle different time zones without confusion. It should also support calendar connections like Google Calendar, Outlook, and Apple Calendar so people can pull in their real availability.

Please include reminders and email notifications, the ability to duplicate a poll, export responses to CSV, and a way for the organizer to hide responses from everyone else if needed. Make it clean, simple, and easy to use on desktop and mobile. If you need to look up current docs for any integrations, go ahead and do that.