build(deps): bump zod from 4.6.5 to 4.6.6 in /ui

Bumps [zod](https://github.com/colinhacks/zod) from 4.6.5 to 4.6.6.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v4.6.5...v4.6.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.6.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

ui/package-lock.json

@@ -25,7 +25,7 @@
     "react-dom": "^19.3.0",
     "react-markdown": "^10.1.0",
     "remark-gfm": "^4.0.1",
-    "zod": "^4.2.0"
+    "zod": "^4.6.6"
   },
   "devDependencies": {
     "@types/node": "^26.6.4",