Use Omarchy command helpers consistently

bin/omarchy-refresh-plymouth

@@ -3,10 +3,10 @@
 # omarchy:summary=Overwrite the user config for the Plymouth drive decryption and boot sequence with the Omarchy default and rebuild it.
 # omarchy:requires-sudo=true
 
-sudo cp -r $OMARCHY_PATH/default/plymouth/* /usr/share/plymouth/themes/omarchy/
+sudo cp -r "$OMARCHY_PATH/default/plymouth/." /usr/share/plymouth/themes/omarchy/
 sudo plymouth-set-default-theme omarchy
 
-if command -v limine-mkinitcpio &>/dev/null; then
+if omarchy-cmd-present limine-mkinitcpio; then
   sudo limine-mkinitcpio
 else
   sudo mkinitcpio -P