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/package.json

@@ -18,6 +18,7 @@
     "@tailwindcss/vite": "^4.3.0",
     "i18next": "^26.0.10",
     "js-cookie": "^3.0.5",
+    "lucide-react": "^1.14.0",
     "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
     "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0",
     "react-i18next": "^17.0.7",