React Query for Server State

Summary

Using React Query as your dedicated tool for anything that ultimately comes from your backend — letting it handle caching, refetching and synchronization instead of hand-rolling it in Redux or Context.

• 1Move a piece of server data out of Redux/Context and into a `useQuery` call instead.
• 2Compare the amount of code saved for loading/error/cache handling.
• 3Learn `invalidateQueries` for refreshing data after a mutation.