Satyamkumark1/Quartz-Ai — reverse-engineered prompt

I want this repo turned from the default Next.js starter into a working app called Quartz AI. Build a clean, modern web app where someone can land on a homepage, understand what the product does, sign in, and open a simple dashboard.

The main experience should feel like an AI workspace. Users should be able to start a new chat or project, type a prompt, get an AI response, and see their recent chats or projects saved so they can come back later. If the AI key or database is not set up yet, make it work with safe demo data and clear environment variable notes.

Use the existing project setup as much as possible, including the app structure, components, database files, middleware, and any real time or background job config already present. Make it polished and responsive, with empty states, loading states, and basic error handling.

Please wire everything enough that I can run it locally with npm run dev. Look up current docs online if needed.