kui/7dtd-map ? reverse-engineered prompt

Build me a web based map viewer for 7 Days to Die that renders the game world from my local game files and lets me open it in the browser. I want it to work on Windows, Mac, and Linux, with a simple setup where I can point the project at my installed copy of the game and then run a build or local dev server. Please make it so the rendered map is easy to browse and works smoothly on a normal desktop screen.

Keep the project easy to run locally, with clear build, lint, and serve commands, and make sure the local dev setup works over HTTPS or localhost since the browser needs that for storage access. If anything in the game data format needs checking, look up the current docs online if you need to. Also please include whatever caching or incremental rebuild behavior makes repeated builds faster when the source files or game files have not changed.