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/codebase_structure.md

@@ -0,0 +1,34 @@
+# Codebase Structure
+
+```
+interblue.pl/
+├── admin658c34/       # Back-office admin panel (obfuscated folder name)
+├── app/               # PrestaShop Symfony app (kernel, AppKernel)
+├── classes/           # PrestaShop core classes
+├── config/            # Configuration files (settings.inc.php, defines.inc.php, etc.)
+├── controllers/       # PrestaShop core controllers
+├── custom/            # Custom utility files (medoo.php, sollux.csv)
+├── img/               # Images (products, categories, etc.)
+├── mails/             # Email templates
+├── modules/           # PrestaShop modules (~120+ modules)
+├── override/          # Class & controller overrides
+│   ├── classes/       # Overridden core classes (Product, Order, Hook, etc.)
+│   └── controllers/   # Overridden front controllers
+├── src/               # Symfony-based PrestaShop source
+│   ├── Adapter/
+│   └── Core/
+├── themes/
+│   ├── InterBlue/     # Active custom theme
+│   └── classic/       # Default PS theme (base)
+├── xml/               # XML configuration files
+├── import-products.php  # Sollux product importer
+├── export.php           # Product export
+├── custom-cron.php      # Custom cron tasks
+└── NOTATKI.md           # Developer notes
+```
+
+## Key Directories for Development
+- **Custom modules**: `modules/customfeaturetab/`, `modules/dw_*`, `modules/addcolumninlist/`, `modules/sposoby_dostawy/`
+- **Overrides**: `override/classes/`, `override/controllers/front/`
+- **Theme**: `themes/InterBlue/`
+- **Custom scripts**: Root-level PHP files (import-products.php, export.php, etc.)