komet/mediaelch ? reverse-engineered prompt

Build me a desktop app called MediaElch that helps manage my Kodi library.

I want it to scan and organize movies, TV shows, concerts, and music, then save the info as NFO files in the right folders. It should also fetch fanart automatically from fanart.tv and make it easy to preview or update the artwork and metadata before saving. The app should feel like a proper media manager, with a clear interface for browsing my collection, editing details, and handling missing or bad metadata.

Please make it cross platform if possible, and keep it polished enough for regular users, not just developers. If you need to check current docs or examples online to match how Kodi metadata files should look, do that. I mainly want a working app that can manage a library, write NFO files, and download artwork reliably.