archinstall creates the user from user_credentials.json BEFORE installing
the 'additional packages' list, so when omarchy-settings populates
/etc/skel/.config/... later in the pacstrap, the user's home has already
been created from an empty skel and missed the seed (user boots into a
terminal with no Hyprland configs).
Copy /etc/skel into /home/$OMARCHY_USER after archinstall finishes (by
which point omarchy-settings has populated skel) and chown to the user.
cp -rT keeps it idempotent: existing files get overwritten, dirs merge.