QA: Headless Chat (Simple) — Mastra

Test Steps

• Navigate to /demos/headless-simple
• Verify the custom minimal chat UI renders (not <CopilotChat />)
• Type a message, press Enter; verify it appears as a user bubble
• Verify the agent responds with an assistant bubble
• Ask "show a card about cats"
• Verify the ShowCard component renders inside the assistant message area

Expected Results

• useAgent + useComponent driven from a plain textarea
• Tool calls rendered via useRenderToolCall