services-artix.conf enabled only sddm + greetd, so LY/LightDM/LXDM were
installed but never service-enabled -> TTY at boot instead of login screen.
Enable the full DM set (artix-service only activates the installed one).
Docs: the live-overlay calamares/ and calamares-online/ dirs both serve the
online installer; there is no offline Calamares config. settings_offline.conf
shipped by the branding package is unused - the launcher always overwrites it.