Update react monorepo to v19

Author: renovate[bot]

frontend/web/package.json

@@ -50,8 +50,8 @@
     "prosemirror-schema-list": "^1.5.0",
     "prosemirror-state": "^1.4.3",
     "prosemirror-view": "^1.37.2",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-markdown": "^9.0.3",
     "react-resizable-panels": "^2.1.7",
     "remark-gfm": "^4.0.0",
@@ -72,8 +72,8 @@
     "@types/d3-scale": "^4.0.8",
     "@types/node": "^22.13.0",
     "@types/pdf-parse": "^1.1.4",
-    "@types/react": "^18.3.18",
-    "@types/react-dom": "^18.3.5",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "jsdom": "^26.0.0",
     "postcss": "^8.5.1",
     "tailwindcss": "^3.4.17",