This pull request fixes the docs site after the Astro 6 upgrade by narrowing the zod alias in docs/astro.config.mjs so Astro's internal zod/v4/core imports are no longer rewritten to the invalid zod/v3/v4/core path.

It also includes the associated docs dependency refresh in docs/package.json and lockfile/package metadata updates in pnpm-lock.yaml and package.json that came from the upgrade flow. The main behavior change is that Starlight can still resolve bare zod imports through the v3 compatibility entrypoint while Astro 6 keeps access to its native Zod v4 subpath imports.