youfu a3fe0fcf65 v2.1: rewrite on CustomTkinter with safer ffmpeg handling ...

- Migrate the UI from tkinter to customtkinter (themed, system appearance)
- Detect ffmpeg via shutil.which; warn and disable concat if it's missing
- Auto-fill the output name from the first selected file
- Inline output-name conflict detection against the source files, with a
  live red warning and the button disabled while a conflict exists
- Escape paths in the concat list file (quotes/backslashes), write as UTF-8
- Run ffmpeg with explicit -c:v copy / -c:a copy and surface stderr on error
- Re-enable the button and clean up file_list.txt on every exit path

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-26 13:27:18 +00:00

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