pin @types/node to match Vercel runtime

The deployed function runs `nodejs24.x` (per .vercel/output/functions/
_render.func/.vc-config.json), so the types should track Node 24, not 25.
The @astrojs/vercel adapter picks the runtime from the local node version
at build time, and our local toolchain is on v24 too.

Author: carlassmann

bun.lock

@@ -79,7 +79,7 @@
 		"@tanstack/router-plugin": "^1.167.34",
 		"@testing-library/jest-dom": "^6.9.1",
 		"@testing-library/react": "^16.3.2",
-		"@types/node": "^25.6.0",
+		"@types/node": "^24.12.2",
 		"@types/react": "19.2.14",
 		"@types/react-dom": "19.2.3",
 		"@types/web-push": "^3.6.4",