SHUKLASHRI/hangout ? reverse-engineered prompt

Build me a polished Flutter app called HANGOUT for nearby social discovery.

I want a premium feeling mobile and web app where people can find and join nearby activities, but with a strong focus on safety, privacy, and trust. Users should be able to sign in with Google or email, browse a feed of hangouts, see a map with an approximate 500m zone instead of the exact meeting spot, and only reveal the real location to the people involved. Please include onboarding, auth, a map screen, a feed screen, and the ability to create or join hangouts.

Make it feel high end, with a glassy modern UI, smooth transitions, and a clean typography driven design. Add a trust score system that helps show whether someone is reliable, including cancellation penalties. Use Firebase for auth, Firestore data, and notifications. If you need to check current Flutter or Firebase best practices, look them up online and keep the app production ready.