Forms with React 19 and Next.js

Demo of building forms with the Next.js App Router and React 19 to answer questions like: 1. Why does the form clear out my input values? 2. How do I pass data from my server action to the client? 3. How do I handle client / server validation? 4. How do I display inline errors next to inputs? Code: https://v0.dev/chat/CiFWYqPHKvT?b=b_0v5ES6AiBeq