add lucide-react dependency and update form handling in MainForm

- Added lucide-react to package dependencies
- Refactored MainForm to improve form handling and user selection
- Removed SuccessPage component and related logic
- Updated localization files to include new keys for invoice details
- Created interfaces for form data and messages

frontend/src/utils/i18n/locales/en/en.json

@@ -3,6 +3,7 @@
     "last-name": "Last Name",
     "phone-number": "Phone Number",
     "invoice": "Invoice",
+    "invoice-details": "Invoice Details",
     "company-name": "Company Name",
     "street": "Street + House No.",
     "postal-code": "Postal Code + City",