add dashboard docs

dashboard/readme.md

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+# Arbiter Dashboard
+
+React dashboard for exploring code reviews and monitoring Arbiter metrics.
+
+## Features
+
+- **Review List** — Browse all reviews with filtering and pagination
+- **Review Detail** — View findings grouped by severity with expandable cards
+- **Deliberation Timeline** — Step-by-step visualization of agent decision process
+- **Metrics Dashboard** — Charts showing verdicts, severities, and review trends
+
+## Quick Start
+
+```bash
+# Install dependencies
+npm install
+
+# Start development server
+npm run dev
+```
+
+The dashboard runs at `http://localhost:5173` by default.
+
+## Configuration
+
+Set the API URL via environment variable:
+
+```bash
+# Development
+VITE_API_URL=http://localhost:8000 npm run dev
+
+# Or create a .env.local file
+echo "VITE_API_URL=http://localhost:8000" > .env.local
+npm run dev
+```
+
+If `VITE_API_URL` is not set, the dashboard assumes the API is served from the same
+origin (useful when proxying through nginx in production).
+
+## Build for Production
+
+```bash
+# Type check and build
+npm run build
+
+# Preview production build
+npm run preview
+```
+
+The build output is in the `dist/` directory. Serve with any static file server or
+use the included Docker configuration.
+
+## Docker
+
+Build and run with Docker:
+
+```bash
+# Build image
+docker build -t arbiter-dashboard .
+
+# Run container
+docker run -p 8080:80 arbiter-dashboard
+```
+
+The Docker image uses nginx to serve the static files and proxy API requests.
+
+## Project Structure
+
+```
+dashboard/
+├── src/
+│   ├── api/              # API client and query functions
+│   │   ├── client.ts     # Base fetch wrapper with error handling
+│   │   └── reviews.ts    # Review-specific API calls
+│   ├── components/
+│   │   ├── common/       # Shared UI components
+│   │   │   ├── LoadingSpinner.tsx
+│   │   │   ├── Pagination.tsx
+│   │   │   └── SeverityBadge.tsx
+│   │   ├── deliberation/ # Deliberation visualization
+│   │   │   ├── ConflictCard.tsx
+│   │   │   ├── DeliberationTimeline.tsx
+│   │   │   └── VerdictBadge.tsx
+│   │   ├── layout/       # App layout components
+│   │   │   ├── Header.tsx
+│   │   │   ├── Layout.tsx
+│   │   │   └── Sidebar.tsx
+│   │   └── reviews/      # Review-related components
+│   │       ├── FindingCard.tsx
+│   │       ├── ReviewCard.tsx
+│   │       ├── ReviewFilters.tsx
+│   │       └── ReviewList.tsx
+│   ├── pages/            # Route pages
+│   │   ├── MetricsPage.tsx
+│   │   ├── ReviewDetailPage.tsx
+│   │   └── ReviewsPage.tsx
+│   ├── types/            # TypeScript type definitions
+│   │   └── api.ts
+│   ├── App.tsx           # Root component with routing
+│   └── main.tsx          # Application entry point
+├── public/               # Static assets
+├── package.json
+├── tsconfig.json
+├── vite.config.ts
+└── Dockerfile
+```
+
+## Routes
+
+| Path | Page | Description |
+|------|------|-------------|
+| `/` | ReviewsPage | List of all reviews with filters |
+| `/reviews/:id` | ReviewDetailPage | Single review with findings and deliberation |
+| `/metrics` | MetricsPage | Aggregate statistics and charts |
+
+## Component Overview
+
+### Layout Components
+
+- **Layout** — Main app layout with header, sidebar, and content area
+- **Header** — Top navigation bar
+- **Sidebar** — Navigation menu with links to reviews and metrics
+
+### Review Components
+
+- **ReviewList** — Paginated list of review cards with filtering
+- **ReviewCard** — Summary card showing review metadata and verdict
+- **ReviewFilters** — Filter controls for repository, status, verdict, author
+- **FindingCard** — Expandable card showing individual agent findings
+
+### Deliberation Components
+
+- **DeliberationTimeline** — Vertical timeline showing deliberation steps
+- **ConflictCard** — Displays detected conflicts between agents
+- **VerdictBadge** — Color-coded badge for review verdicts (approve/changes/comment)
+
+### Common Components
+
+- **SeverityBadge** — Color-coded badge for finding severities
+- **LoadingSpinner** — Loading indicator
+- **Pagination** — Page navigation controls
+
+## Tech Stack
+
+| Technology | Purpose |
+|------------|---------|
+| React 19 | UI framework |
+| React Router 7 | Client-side routing |
+| TanStack Query | Data fetching and caching |
+| Tailwind CSS 4 | Styling |
+| Recharts | Charts and visualizations |
+| Vite | Build tool and dev server |
+| TypeScript | Type safety |
+
+## Development
+
+### Linting
+
+```bash
+npm run lint
+```
+
+### Type Checking
+
+```bash
+npm run typecheck
+```
+
+### Adding New Pages
+
+1. Create component in `src/pages/`
+2. Add route in `src/App.tsx`
+3. Add navigation link in `src/components/layout/Sidebar.tsx`
+
+### Adding API Endpoints
+
+1. Add types in `src/types/api.ts`
+2. Add query function in `src/api/reviews.ts`
+3. Use with `useQuery` hook in component