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>

package.json

@@ -20,7 +20,7 @@
     "relay": "npm run relay-clean && npm run relay-compile"
   },
   "devDependencies": {
-    "relay-compiler": "^20.1.1",
+    "relay-compiler": "^21.0.1",
     "turbo": "^2.9.14"
   },
   "graphql": {
@@ -44,6 +44,6 @@
   "license": "MIT",
   "packageManager": "npm@11.8.0",
   "dependencies": {
-    "react-dom": "^19.2.1"
+    "react-dom": "^19.2.7"
   }
 }