nixos-wizard v0.4.0

New features

• Multi-drive partition layouts - partition configurations can now span multiple drives instead of being limited to a single device
• --dry-run mode - run the full installer flow without executing any destructive operations; generated configs are printed to the log for review
• Drive selection page improvements - added "Clear Configuration", "Save and Exit", and "Back" buttons with seamless focus cycling between the drives table, preview table, and action buttons