Enable recording of multiple products in each fireworks sale registry

Refactors NewSaleForm to handle an array of products, and removes NewSaleFormMulti.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e80fed01-7137-4997-b9af-dad57132d430
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/e80fed01-7137-4997-b9af-dad57132d430/4xOaQU9

replit.md

@@ -305,6 +305,16 @@ Preferred communication style: Simple, everyday language.
 - ✅ **Production Ready**: All export functionalities operational with real database photos
 - ✅ **Excel Images**: Photos from sales (recto, verso, ticket) properly displayed in Excel export files
 
+### Complete Multi-Product Sales System (January 11, 2025)
+- ✅ **Multi-Product Interface**: Implemented complete dynamic product management in new sale form
+- ✅ **Product Array Handling**: Add/remove products dynamically with proper validation for each item
+- ✅ **EAN-13 Validation**: Individual validation for each product with clear error messages
+- ✅ **Modern UI Design**: Color-coded sections with responsive design for all screen sizes
+- ✅ **Field Array Management**: React Hook Form integration with useFieldArray for proper state management
+- ✅ **Production Integration**: All multi-product functionality ready for deployment
+- ✅ **Database Schema**: Sales and sale_products tables properly configured for multi-product sales
+- ✅ **Export Compatibility**: All export functions (Excel, PDF, CSV) support multiple products per sale
+
 ### Docker Configuration & Cleanup (January 9, 2025)
 - ✅ Complete Docker setup optimized for external PostgreSQL database
 - ✅ Docker Compose configuration with RegisFlow application only