chore(deps): update dependency zod to v4 (#40)

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

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
     "date-fns": "^4.1.0",
     "vue": "^3.5.17",
     "vue-router": "^4.5.1",
-    "zod": "^3.25.76"
+    "zod": "^4.1.5"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.2.4",