walaa-horani/whiteboard ? reverse-engineered prompt

Build me a web app where I can describe a diagram in plain English and it turns that into an editable whiteboard on a canvas like Excalidraw.

I want to be able to type something like a flowchart, system diagram, or simple sketch, then see it drawn out visually, and still be able to click and edit the shapes, text, and connectors afterward. It should feel fast and clean, with a simple landing page, sign in, and a place to save my boards so I can come back later.

Please use a modern Next.js app, with user accounts, database storage, and a nice polished UI. Make it work smoothly on desktop, and keep the drawing experience intuitive for non technical people. If you need to look up the current docs for any of the tools or libraries, go ahead and do that.