Design Next.js Server Actions for forms and mutations with validation, error handling, revalidation, and optimistic UI.
## CONTEXT I am using Next.js Server Actions to handle forms and mutations and want a robust, secure pattern instead of ad hoc handlers. I need consistent input validation, typed error returns, cache revalidation, and smooth optimistic UI, while keeping the server boundary safe. I am on the App Router in 2026. ##…
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