- Add StaffOnboarding.tsx main hub with welcome banner, progress ring,
and quick action cards
- Add StaffOnboardingChecklist.tsx with interactive Day 1/Week 1/Month 1
checklist that saves progress to database
- Add database migration for staff_onboarding_progress and
staff_onboarding_metadata tables with RLS policies
- Add API endpoint /api/staff/onboarding for fetching and updating
onboarding progress with admin view for managers
- Add routes to App.tsx for /staff/onboarding and /staff/onboarding/checklist
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