qarmin/czkawka ? reverse-engineered prompt

Build me a fast, free app for cleaning up my computer. I want it to scan folders and help me find duplicate files, empty folders, big files, empty files, temporary files, bad file names, broken files, invalid shortcuts, and files whose contents do not match their extension. It should also spot similar photos, similar videos, and duplicate music, then let me review the results before I delete anything.

Make it work on desktop and keep it lightweight and private, with no internet access or tracking. If it makes sense, include both a simple desktop interface and a command line version for automation. I’d like the scans to be very fast, remember previous results when possible, and support multiple languages. Please build it in a way that feels polished and easy to use, and look up current docs online if you need to.