fix(deps): update dependency zod to v4 (#245)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -34,7 +34,7 @@
     "react-dom": "^19.0.0",
     "react-router": "^7.1.3",
     "ulidx": "^2.4.1",
-    "zod": "^3.24.1"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@cloudflare/vitest-pool-workers": "^0.10.0",