Server Actions

Summary

Async functions marked `'use server'` that can be called directly from client components (e.g. on form submit) to run server-side logic without a separate API route.

• 1Build a form that submits directly to a Server Action instead of a `fetch` call.
• 2Learn how Server Actions integrate with `useFormStatus`/`useActionState` for pending UI.
• 3Understand they're a newer alternative to hand-rolled API routes for many mutations.