Mix static, cached, and dynamic content in a single Next.js route with Partial Prerendering.

• Enable with cacheComponents: true in next.config.ts; replaces the old experimental.ppr flag
• Use the 'use cache' directive at file, component, or function level to cache async data with automatic key generation based on arguments and closures
• Control cache lifetime with cacheLife() using built-in profiles ('minutes', 'hours', 'days', 'weeks', 'max') or inline configuration with stale, revalidate, and expire times
• Invalidate caches with cacheTag() for tagging and updateTag() for immediate refresh or revalidateTag() for background revalidation
• Wrap dynamic content in Suspense; cannot access cookies(), headers(), or searchParams inside use cache blocks unless using 'use cache: private'