docs: add comprehensive code comments, update README and TASKS, create training and troubleshooting guides

- Add JSDoc comments to API routes and business logic functions
- Update README.md with Phase 2 status and deployment/production notes
- Enhance TASKS.md with estimated timelines and dependencies
- Create docs/STAFF_TRAINING.md for team onboarding
- Create docs/CLIENT_ONBOARDING.md for customer experience
- Create docs/OPERATIONAL_PROCEDURES.md for daily operations
- Create docs/TROUBLESHOOTING.md for common setup issues
- Fix TypeScript errors in hq/page.tsx

components/kiosk/BookingConfirmation.tsx

@@ -11,6 +11,9 @@ interface BookingConfirmationProps {
   onCancel: () => void
 }
 
+/**
+ * BookingConfirmation component that allows confirming a booking by short ID.
+ */
 export function BookingConfirmation({ apiKey, onConfirm, onCancel }: BookingConfirmationProps) {
   const [shortId, setShortId] = useState('')
   const [loading, setLoading] = useState(false)