jayson-lennon/ztm-project-uchat ? reverse-engineered prompt

Build me a simple web chat app called uChat that has a clean modern look and works in the browser.

I want users to be able to sign in, see a list of chats or conversations, open one, and send and read messages in real time. Make the layout feel like a polished messaging app, with a sidebar for chats and a main area for the selected conversation, and use the provided design files as the visual guide. Please also wire up the backend so messages and user data are saved in PostgreSQL, and make the frontend talk to it properly.

If anything in the current setup is outdated or unclear, look up the current docs online and adjust as needed. Keep it working on desktop first, but make it feel like something that could grow into a full chat product.