Extract shared helpers into lib.sh (log, err, confirm, path constants) and refactor post-install.sh + update.sh to source it. New transform.sh converts an existing Arch+Wayland system to Moonarch: pre-flight summary, config backup, DM conflict resolution, PulseAudio removal, full package install, and hard overwrite of all configs. Also migrate kanshi from niri spawn-at-startup to systemd user service.