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-lock.json

@@ -16,6 +16,7 @@
         "@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",
@@ -3105,6 +3106,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "1.14.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-1.14.0.tgz",
+      "integrity": "sha512-+1mdWcfSJVUsaTIjN9zoezmUhfXo5l0vP7ekBMPo3jcS/aIkxHnXqAPsByszMZx/Y8oQBRJxJx5xg+RH3urzxA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/magic-string": {
       "version": "0.30.21",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",