openscad/openscad-playground ? reverse-engineered prompt

Build me a browser based OpenSCAD playground where I can write SCAD code in a code editor, see the 3D result update as I type, and do a full render when I want. I want it to feel like a polished little app, with syntax highlighting, autocomplete for imports and functions, a built in library browser, and support for OpenSCAD customizer controls.

Make it work nicely on both desktop and mobile, with the editor and preview stacked on small screens and side by side on larger ones. It should also be installable like a PWA and keep my work saved locally so I can keep using it offline after it loads. If you need current docs or example behavior, look them up online. Please include a few sample OpenSCAD files and make the preview fast and responsive.