Upgrade frontend toolchain to latest majors

Bump React 19.2, Relay 21, React Router 8, Vite 8 with
@vitejs/plugin-react 6, ESLint 10, GraphQL 17, TypeScript 6,
@types/node 24, and Tailwind 4.3 across the workspaces.

vite-plugin-react 6 (Vite 8) no longer runs Babel, so the Relay
tagged-template transform now runs through @rolldown/plugin-babel
in the console and trust Vite configs.

Relay 21 ships first-party types and enables the ambiguous-alias
check by default; disable that flag to preserve existing queries
and add explicit usePreloadedQuery type arguments where the new
types no longer infer the operation. TypeScript 6 deprecations and
stricter inference are addressed in tsconfigs and call sites.

Keep n8n-node on ESLint 9 and eslint-plugin-react on 7.37.5, the
newest releases compatible with their toolchains.

Signed-off-by: Émile Ré <emile@probo.com>

examples/cookie-banner-react/package.json

@@ -10,14 +10,14 @@
   "dependencies": {
     "@probo/cookie-banner": "*",
     "posthog-js": "^1.376.2",
-    "react": "^19.2.1",
-    "react-dom": "^19.2.1"
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7"
   },
   "devDependencies": {
-    "@types/react": "^19.2.1",
-    "@types/react-dom": "^19.2.1",
-    "@vitejs/plugin-react": "^4.5.2",
-    "typescript": "~5.8.3",
-    "vite": "^6.3.5"
+    "@types/react": "^19.2.17",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.2",
+    "typescript": "~6.0.3",
+    "vite": "^8.0.16"
   }
 }