React Hook Form × Zodで爆速バリデーション！エラーを消してUXを上げる

Create a practical example showing form validation with React Hook Form and Zod. Include a registration form with fields: name (required, min 2 chars), email (valid email), age (number, min 18), password (min 8 chars, must include uppercase, lowercase, number). Show error messages inline, disable submit until valid, and style with a modern, clean UI. Use CDN for React, ReactDOM, React Hook Form, and Zod. No build tools.