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.

.serena/memories/project_overview.md

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+# interblue.pl - Project Overview
+
+## Purpose
+E-commerce store **interblue.pl** built on **PrestaShop 1.7.x**. The shop sells lighting products (Sollux Lighting and others). It integrates with multiple marketplaces (Allegro, Empik) and shipping providers (DPD, InPost, Poczta Polska, Geis, FedEx).
+
+## Tech Stack
+- **CMS/Framework**: PrestaShop 1.7.x (PHP, Symfony 3.x/4.x core)
+- **Template Engine**: Smarty (front) + Twig (admin/back-office)
+- **Database**: MySQL (via PrestaShop's `Db` class and ObjectModel ORM)
+- **Front Theme**: Custom theme `InterBlue` (based on classic)
+- **PHP**: 7.x+ (PrestaShop 1.7 compatible)
+- **Additional lib**: Medoo (lightweight PHP database framework, used in custom scripts)
+
+## Key Integrations
+- **Marketplaces**: Allegro (x13allegro, marzaallegro), Empik (empikmarketplace)
+- **Payments**: Przelewy24, imoje, paybynet, ps_cashondelivery, ps_checkpayment, ps_wirepayment
+- **Shipping**: DPD Poland, InPost, Poczta Polska, FedEx, Geis, Paczka w Ruchu
+- **Analytics**: Google Tag Manager (cdc_googletagmanager), Google Analytics 4 (pdgoogleanalytycs4pro), Google Merchant Center (pdgooglemerchantcenterpro)
+- **Other**: Baselinker, Sendinblue (email marketing), eKomi reviews
+
+## Custom Scripts (project root)
+- `import-products.php` - Imports products from Sollux Lighting XML feed
+- `export.php`, `export-csv.php` - Product export scripts
+- `custom-cron.php`, `custom-script.php` - Custom cron/automation
+- `google-merchant_id-1.xml` - Google Merchant feed
+
+## Custom Modules (developed in-house)
+- `customfeaturetab` - Custom Feature Tab with DB integration and AJAX
+- `dw_promocyjne_produkty` - Promotional products
+- `dw_promowane_produkty` - Promoted products
+- `addcolumninlist` - Extra column in product list (BO)
+- `AddOrderExtraFields` - Extra fields on orders
+- `ordersextracolumns` - Extra columns in order list
+- `sposoby_dostawy` - Delivery methods customization
+
+## Override System
+Active overrides in `override/`:
+- Classes: Product, Combination, Dispatcher, Hook, Link, Media, FrontController, Order, OrderCarrier, OrderHistory, OrderInvoice, OrderPayment
+- Controllers (front): Category, Cms, Manufacturer, Order, Product, Supplier