v0.2.0

Release v0.2.0\n\n- Make M4B the default audiobook output.\n- Use EPUB title metadata for the default output filename.\n- Embed chapter metadata into generated M4B files with ffmpeg.\n- Keep chapter WAV export via output_format="wav".\n- Add colored tqdm progress bars for chapter and chunk processing.\n- Group EPUB paragraph blocks for more stable Chatterbox generation.