rohitdahale/unsaid ? reverse-engineered prompt

Build me a simple Flutter app called Unsaid that works nicely on both mobile and web.

I want it to feel clean and modern, with a straightforward home screen and the basics in place so I can grow it later. Since this project already has Firebase and Firestore setup, please wire the app so it can save and load data from the cloud, and make sure the rules and configuration are set up in a sensible way. Also make the web version ready to deploy, since I may host it on Netlify.

Please keep the code organized, use sensible defaults, and make the app easy to run locally. If anything needs current setup details from Flutter or Firebase docs, look them up online and use the latest approach. After building it, I should be able to open it and see a working app with a polished starting point, not just an empty scaffold.