Dashboard analytics (velocity chart, burndown, agent utilization)

[MeisnerDan]

Build an analytics dashboard showing productivity metrics: velocity (tasks completed per week), burndown chart (task count over time), and agent utilization (work distribution across agents). This gives users and teams data-driven insights into productivity patterns and helps identify bottlenecks or overallocation.

Acceptance Criteria

• Velocity chart: tasks completed per week, grouped by importance level
• Burndown chart: remaining tasks vs. time, with trend line
• Agent utilization: pie/bar chart showing task distribution by assignedTo agent
• Time period selector: weekly, monthly, all-time views
• Charts update in real-time as tasks are completed
• Responsive design: charts adapt to mobile screens
• Data export: download chart data as CSV or PNG screenshot
• Use a charting library (e.g., Recharts, Chart.js) that works with React
• Unit tests for chart data calculations
• Performance: lazy-load analytics to avoid blocking page load