Chat UI — streaming chat interface with history

[Punkte]

What to build

The main chat screen: a message thread UI that sends messages to POST /chat, streams the response token-by-token, and shows persistent chat history. Includes the ethical disclaimer.

Acceptance criteria

• Message input sends to POST /chat and displays user message immediately
• AI response streams in token-by-token (no waiting for full response)
• Chat history loads on page refresh
• Ethical disclaimer visible at top: "Responses are generated by AI based on your past conversations."
• Typing indicator shown while response is streaming
• Mobile-responsive, feels like a real messaging app

Blocked by

• Chat engine CLI prototype — persona + RAG + history → Claude streaming, save messages #7
• Persona preview UI — display + edit persona card #9