## Your Task US-020

1. Read the full app PRD at `prd-main.md` (in the same directory as this file)
2. Read the PRD at `prd.json` (in the same directory as this file)
3. Read the progress log at `progress.txt` (check Codebase Patterns section first)
4. **DO YOUR JOB**
5. Update the PRD to set `passes: true` for the completed story
6. Append your progress to `progress.txt`

## Progress Report Format

APPEND to progress.txt (never replace, always append):
```
## [Date/Time] - [Story ID]
- What was implemented
- Files changed
- **Learnings for future iterations:**
  - Patterns discovered (e.g., "this codebase uses X for Y")
  - Gotchas encountered (e.g., "don't forget to update Z when changing W")
  - Useful context (e.g., "the evaluation panel is in component X")
---
```

## USER REQUEST
{
  "id": "US-020",
  "title": "Context-scoped AI chat UI",
  "description": "As a user, I want the AI chat (revealed by the Fluid Curtain) to display a context header, support message input, and stream AI responses.",
  "acceptanceCriteria": [
    "Chat panel shows a context header using shadcn/ui Badge (variant=outline): 'Chatting about: [Project Name]' when opened from a project detail view, or 'Global workspace' when opened from other sections",
    "Chat input box uses shadcn/ui Textarea: white background, border #d4d4d4, shadow-lg, min-height 109px, placeholder 'Ask me anything...'; Send uses shadcn/ui Button (black bg, Send Lucide icon + 'Send' label) anchored bottom-right",
    "User messages appear as right-aligned message bubbles using shadcn/ui Card; AI responses as left-aligned Cards",
    "Streaming: AI response tokens appended to the current AI bubble as they arrive from ai.chat",
    "A loading spinner or pulsing indicator (shadcn/ui Skeleton) shown while waiting for first token",
    "If ai.chat returns { error }, display the error message in a shadcn/ui Card with destructive border styling",
    "Chat history is session-only — cleared when the curtain closes or the app restarts",
    "Install shadcn/ui components via 'npx shadcn@latest add textarea' before implementing (card, badge, button, skeleton already installed)",
    "Typecheck passes",
    "Verify in browser using dev-browser skill"
  ],
  "priority": 20,
  "passes": false,
  "notes": ""
}