Ibrahist/GeoLibre ? reverse-engineered prompt

Build me a lightweight GIS app called GeoLibre that lets people view, explore, and analyze geospatial data right in the browser, and also works as a desktop and mobile app. I want a clean map based interface where users can add layers, view vector and raster data, switch basemaps, see 3D terrain and buildings, and inspect things like coordinates, distances, areas, and legends. It should feel fast and modern, with data staying local and private as much as possible.

Please include a geoprocessing area with a big toolbox of common spatial tools like terrain, hydrology, LiDAR, remote sensing, and vector analysis, and make it easy to run those tools without needing a server. If you need to check current docs or best practices for the mapping libraries, go ahead and look them up online. Make it responsive so it works well on small screens too, and keep the whole thing polished enough to demo.