Extract the confirmation into its own file

bin/omarchy-update-confirm

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -e
+
+gum style --border normal --border-foreground 6 --padding "1 2" \
+  "Ready to update Omarchy?" \
+  "" \
+  "• You cannot stop the update once you start!" \
+  "• Make sure you're connected to power or have a full battery"
+
+if ! gum confirm --default=false "Continue with update?"; then
+  echo "Update cancelled"
+  exit 0
+fi