Update Mantine and React versions

Author: alexanderbock

backend/frontend/package-lock.json

@@ -9,15 +9,15 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@mantine/core": "^7.17.8",
-    "@mantine/hooks": "^7.17.8",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "@mantine/core": "^9.0.1",
+    "@mantine/hooks": "^9.0.1",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
     "react-router-dom": "^6.28.0"
   },
   "devDependencies": {
-    "@types/react": "^18.3.1",
-    "@types/react-dom": "^18.3.1",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^4.3.4",
     "typescript": "^5.6.2",
     "vite": "^6.0.5"