QA: A2UI - Fixed Schema — CrewAI Conversational Flows

• Navigate to /demos/a2ui-fixed-schema.
• Verify the page root (data-testid="a2ui-fixed-schema-root") renders.
• Click the "Find SFO → JFK" suggestion pill.
• Verify a flight card renders with "SFO → JFK", the airline "United Airlines", and the price "$289".
• Click the "Book flight" button on the card; verify it switches to "Booked ✓" (ActionButton with local state — no backend round-trip).
• Ask a free-form flight question ("flight from LAX to BOS on Delta for $320") and verify the card updates with the new data model.