useOnboardingSurveyPrompt: shouldShowPrompt required !!projectRef for all
surfaces, which would always be false during org creation (no project
selected). Gate is now only applied to project_home, where it's meaningful.
Home.tsx: isMatureProject was parsing inserted_at in local time while
isRecentlyCreatedProject (directly below) explicitly uses dayjs.utc().
Both now use UTC for consistency.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>