Use our pkg helpers consistently

install/packaging/base.sh

@@ -1,3 +1,3 @@
 # Install all base packages
 mapfile -t packages < <(grep -v '^#' "$OMARCHY_INSTALL/omarchy-base.packages" | grep -v '^$')
-sudo pacman -S --noconfirm --needed "${packages[@]}"
+omarchy-pkg-add "${packages[@]}"