fix(culture): hydration-safe "last updated" label on /admin/culture + sweep tests in the Docker gate (QA sweep 2026-09-16 follow-up)
- fix(culture): format the settings "last updated" label after hydration so /admin/culture stops throwing React #418
- Merge pull request #451 from tpromni/fix/qa-sweep-0916-culture-label
Source: tpromni/coach-pulse-admin-ui → dev