feat: Add phone number validation to order confirmation

- Implemented phone number normalization and validation in custom_js.js.
- Added alert class to phone input on validation failure.
- Disabled confirm button until a valid phone number is entered.
- Updated custom.scss to style alert state for phone input.
- Modified footer.tpl to include a new custom JavaScript file.
- Updated head.tpl to reflect the new version of custom.css.
- Minor formatting adjustments in existing CSS and JS files.

themes/charme/assets/js/custom.js

@@ -727,4 +727,4 @@ $(window).on('resize', function(){
     }, 100);
 
 
-});
+});