Jason Woltje a5ee974765 feat(#375): frontend token usage and cost dashboard ...

- Install recharts for data visualization
- Add Usage nav item to sidebar navigation
- Create telemetry API service with data fetching functions
- Build dashboard page with summary cards, charts, and time range selector
- Token usage line chart, cost breakdown bar chart, task outcome pie chart
- Loading and empty states handled
- Responsive layout with PDA-friendly design
- Add unit tests (14 tests passing)

Refs #375

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-15 02:10:22 -06:00

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