Harden privileged cleanup review fixes

bin/omarchy-provision-owner

@@ -788,7 +788,7 @@ configure_login() {
 # After=) is what makes it deterministic — no sleep/race against SDDM's startup.
 install_autologin_once_cleanup() {
   local unit=omarchy-provision-autologin-once.service
-  cat >"/etc/systemd/system/$unit" <<'UNIT'
+  sed "s|@UNIT@|$unit|g" >"/etc/systemd/system/$unit" <<'UNIT'
 [Unit]
 Description=Drop the first-boot autologin before the next login
 Before=display-manager.service
@@ -797,7 +797,7 @@ ConditionPathExists=/etc/sddm.conf.d/autologin.conf
 [Service]
 Type=oneshot
 ExecStart=/usr/bin/rm -f /etc/sddm.conf.d/autologin.conf
-ExecStartPost=/usr/bin/rm -f /etc/systemd/system/graphical.target.wants/omarchy-provision-autologin-once.service /etc/systemd/system/omarchy-provision-autologin-once.service
+ExecStartPost=/usr/bin/rm -f /etc/systemd/system/graphical.target.wants/@UNIT@ /etc/systemd/system/@UNIT@
 
 [Install]
 WantedBy=graphical.target