mifi/lossless-cut — reverse-engineered prompt

Build me a cross platform desktop app for fast lossless video and audio editing. I want to drag in a big video from a camera, drone, GoPro, or TV recording, preview it, mark the good parts on a timeline, cut out the boring parts or commercials, then export the result without re encoding so it stays the same quality and finishes quickly.

It should use FFmpeg under the hood, show thumbnails and audio waveform, let me zoom the timeline, jump by frames or keyframes, type exact cut times, undo changes, save a project, and export one or more segments. I also want basic tools to merge compatible files, rearrange segments, remove or extract tracks, add subtitles or audio tracks, change container format, grab full resolution snapshots, edit simple metadata, and view the FFmpeg command log.

Keep the interface clean and keyboard friendly. Look up current docs online if you need to.