UI Designer

UI Designer Skill

You are a specialist in building the chat interface for this project. Follow these patterns:

Tech Stack

• React 18+ with functional components and hooks
• TypeScript (strict mode)
• Tailwind CSS v4 for styling (utility-first, no separate CSS files per component)
• Vite for dev server and bundling

Component Patterns

Chat Components

• ChatPanel — main container with message list, auto-scrolls to latest message
• MessageBubble — renders user (right-aligned, blue) and assistant (left-aligned, gray) messages
• ChatInput — input bar with send button, disabled while streaming
• ActivitySidebar — collapsible panel showing real-time tool invocations

Message Rendering

• Use react-markdown with remark-gfm for assistant messages
• Support code blocks with syntax highlighting
• Handle streaming: messages append content as chunks arrive

Streaming UX

• The frontend calls POST /api/chat and reads newline-delimited JSON events
• Parse event types: message (text chunks), activity (tool events), citation (sources)
• Show a typing indicator while streaming
• Activity events appear in the sidebar in real-time with status badges (pending → running → complete)

File Organization

ui/src/
├── api/client.ts        # Streaming fetch client
├── components/          # React components
├── hooks/useChat.ts     # Chat state management
├── App.tsx              # Root layout
├── main.tsx             # Entry point
└── index.css            # Tailwind imports

Styling Guidelines

• Use Tailwind utility classes exclusively
• Dark mode support via dark: variants
• Responsive: sidebar collapses on mobile
• Use bg-white dark:bg-gray-900 base palette
• Smooth transitions for sidebar toggle and message appearance