fix(deps): update react monorepo to v19

Author: renovate[bot]

client/package.json

@@ -29,9 +29,9 @@
     "jszip": "^3.10.1",
     "lazy-z": "1.12.1",
     "next": "^15.5.4",
-    "react": "^18.3.1",
+    "react": "^19.0.0",
     "react-chartjs-2": "^5.2.0",
-    "react-dom": "^18.3.1",
+    "react-dom": "^19.0.0",
     "react-router-dom": "^7.0.0",
     "regex-but-with-words": "^1.5.0",
     "sass": "1.93.2",