Fix tilde expansion in sol import and add text dry-run segmentation
Expand ~ in media path with os.path.expanduser() to fix FileNotFoundError
when paths are shell-quoted. Add LLM segmentation preview to text/PDF
dry-run output, paralleling audio's segment/key display. Update help
text to reflect audio/text (not video) support.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>