Fixed all critical and high-priority issues from code review:
Security fixes:
- Fix shell injection vulnerability with proper path escaping
- Add timestamped backup creation before modifying shell configs
Reliability improvements:
- Add comprehensive user input path validation
- Add iCloud sync state checking with soft warnings
- Improve shell detection to use default shell (not current session)
Cross-platform support:
- Add platform detection for iCloud features (macOS only)
- Document error handling approach
- Add helpful error messages with actionable suggestions
All changes ensure the commands work safely across Linux, macOS, and
Windows while providing better UX and preventing common user mistakes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
