roshabbhandari/RBGraph ? reverse-engineered prompt

Build me a local first web app where I can describe a software system in plain English and it turns into a clean technical diagram.

I want to be able to paste something like a React frontend talking to a FastAPI backend with Redis and PostgreSQL, then see a diagram I can edit with short chat commands like add Redis, move auth left, or highlight rollback path. It should support architecture, workflow, sequence, data flow, and lifecycle diagrams, and it should feel smart about common tech services when placing things visually.

Please include dark and light themes, remember my preference, and let me export the finished diagram as SVG, PNG, JPEG, WebP, and standalone HTML. I also want higher resolution image exports and a way to copy a crisp PNG to the clipboard when the browser allows it.

Keep a history in SQLite, validate the diagram and SVG, and make sure the app runs locally with a simple backend and browser frontend. If you need to check current docs for anything, go ahead and look them up online.