Replaces the one-shot form with a Copygen-style chat at
/conversations/:id. Each turn is classified as generate / refine /
clarify by a lightweight LLM intent router; generate and refine intents
enqueue an RQ job that produces a new BannerSet, while clarify returns
an inline reply without touching banners.
New backend:
- Conversation + ConversationMessage models + migration 0005
- intent_router service (chat_structured, 3-intent schema)
- chat_turn RQ task with _persist_banner_set helper extracted from
_generate_copy_async for reuse
- /api/conversations CRUD + POST /messages endpoint
- JobType.CHAT_TURN added
New frontend:
- ChatBrief page: message bubbles, inline BannerPreview cards with
checkbox selection and "Open banner editor" CTA (same Medium+Large
validation rule as VariantsGrid)
- ConversationLanding: /conversations/new creates and redirects
- conversationId added to journey store
- "New Brief" nav now points to /conversations/new
- Default route redirects to /conversations/new
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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