Add review step template for one page checkout module

- Introduced a new template file 'review copy.tpl' for the order summary step in the one page checkout process.
- The template includes a loading indicator and a header for the order summary section.
- Conditional rendering based on customer registration status is implemented.

modules/onepagecheckoutps/views/templates/front/steps/review copy.tpl

@@ -0,0 +1,22 @@
+{*
+    * We offer the best and most useful modules PrestaShop and modifications for your online store.
+    *
+    * We are experts and professionals in PrestaShop
+    *
+    * @author    PresTeamShop.com <support@presteamshop.com>
+    * @copyright 2011-2017 PresTeamShop
+    * @license   see file: LICENSE.txt
+    * @category  PrestaShop
+    * @category  Module
+*}
+
+{if !$register_customer}
+    <div id="onepagecheckoutps_step_review_container" class="{$classes|escape:'htmlall':'UTF-8'}">
+        <div class="loading_small"><i class="fa-pts fa-pts-spin fa-pts-refresh fa-pts-2x"></i></div>
+        <h5 class="onepagecheckoutps_p_step onepagecheckoutps_p_step_four">
+            <i class="fa-pts fa-pts-check fa-pts-2x"></i>
+            {l s='Order Summary' mod='onepagecheckoutps'}
+        </h5>
+        <div id="onepagecheckoutps_step_review"></div>
+    </div>
+{/if}