rendevu-dapp/rendevu-web — reverse-engineered prompt

Build me a first real version of the Rendevu web app from this repo instead of the default starter page. I want it to feel like a polished product, with a clean home page, simple navigation, responsive layout, and a few believable screens so someone can click around and understand what the app is for.

The README does not really explain the product yet, so please look through the existing code, the GraphQL setup, and the current config to infer the intended direction and shape the app around that, rather than inventing a lot of random features. Give it good visual polish, clear copy, and solid loading, empty, and error states. If there is already enough structure for real data, connect it in a basic useful way. If not, create a realistic starter experience that is easy to extend.

Please keep the code tidy and make sure it runs locally without surprises. You can look up current docs online if needed.