#swr

Implement SWR for optimal data experience. Pattern: 1. useSWR hook with cache key. 2. Return stale data immediately. 3. Revalidate in background. 4. Dedupe simultaneous requests. 5. Focus revalidation. 6. Interval polling for real-time feel. 7. Error retry with exponential backoff. 8. Mutation with useSWRMutation. Use globally for all requests and implement dependent fetching for serial queries.