Add an "Update" button to each skill card on the My Skills dashboard
page. Clicking it navigates to the Publish page with the skill's
namespace and visibility pre-selected, reducing manual steps when
re-publishing a skill package.
- Add visibility field to SkillSummaryResponse so the list API exposes
each skill's current visibility setting
- Add publish-prefill module to normalize and validate URL search params
- Wire TanStack Router validateSearch on the publish route
- Add E2E tests covering the prefill flow and invalid-param fallback
