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

lib/utils.ts

@@ -1,6 +1,9 @@
 import { type ClassValue, clsx } from "clsx"
 import { twMerge } from "tailwind-merge"
 
+/**
+ * cn function that merges class names using clsx and tailwind-merge.
+ */
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }