Ryan Malloy 72cfd8191a Fix React hydration mismatch and clean up stale service workers
- Pin formatDate to timeZone: 'UTC' so server and client produce
  identical date strings (fixes React error #418)
- Add one-shot service worker unregistration since SpiceBook doesn't
  use one — clears phantom registrations from browser cache
2026-02-20 16:07:42 -07:00
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