Replace 'react-router-dom' with 'next/link' routing

NextJs Router and the react-router-dom are competing which causes navigation bug.

Do NOT touch
src/app/App.tsx as this is the sync - entry point for nextjs / legacy router
src/app/router/Router.tsx
src/app/router/ProtectedRoute.tsx

All other pages should have their react-router-dom navigation functions useNavigate, useSearchParams, useLocation etc replaced for the next/link equivalent