dolezvo1/nihonium — reverse-engineered prompt

Build me a small desktop and browser diagramming app for CASE or UML style modelling, like a lightweight visual editor for creating diagrams with boxes and relationships. I want it written in Rust with an egui style interface, and it should feel simple and fast rather than like a huge enterprise tool.

The app should let me create and edit diagram projects, place items on a canvas, connect them, move them around, and save my work to a project file so I can reopen it later. Please include a basic native build that runs with cargo, and make sure it can also be built for the web so it can be hosted as a browser version.

It’s okay if this is an early version, but please make it usable enough to model small diagrams and test the workflow. Add a clear README with run instructions and a warning that users should save often because the project format may change.