keplergl/kepler.gl ? reverse-engineered prompt

Build me a fast web based map app for exploring large geospatial data sets, something like a polished demo of kepler.gl. I want to be able to load location data, see it on an interactive map, zoom and pan smoothly, and visualize millions of points without the app feeling slow. It should support common data exploration tools like filtering, clustering or aggregating points, changing how layers look, and inspecting data on hover or click.

Make it easy to use as both a standalone demo and an embeddable React component for another app. Include a clean default interface, sample data, and a simple way to plug in a map token for the base map. Keep the code organized and ready for people to extend, and if you need current docs for any map or React details, look them up online first.