Build Backstage Plugin with React

Build a custom Backstage plugin using React to display TaskFlow metrics. Master React hooks (useState, useEffect), component development with TypeScript, Material-UI components, and API integration patterns. Create the "TaskFlow Dashboard" plugin that shows live metrics (task counts, active users, deployment status) with professional React code and proper error handling.

You'll use Backstage CLI to scaffold a plugin, write React components with hooks, fetch data from TaskFlow API, handle loading and error states, style with Material-UI cards and grids, and integrate the plugin into Backstage's navigation and routing system.