soemoehtun/Point-File-Creator ? reverse-engineered prompt

Build me a browser based tool where I can upload a CSV or Excel file with location data, map the latitude, longitude, and site name columns, and then see all the points drawn on an interactive map.

I want to be able to search and filter the points, change marker color, size, opacity, and show labels if I want, with a legend that updates by category. It should support a few map styles like normal street, satellite, and topo, and it needs to handle a lot of points smoothly.

Please make the app process everything locally in the browser, with no server upload. After I style the map, I want to export it as a KMZ file for Google Earth, or download a standalone HTML file that I can send to someone and they can open it directly. If you need to, look up the current docs for anything that helps with the export or map library.