F051: Dashboard Analytics

## F051: Dashboard Analytics

**Status:** ⬜ Not Started

**Description:** Dashboard tabs in the web panel for analytics and management.

**Tabs:**
- Cost history + charts (trends over time)
- Pattern/rejection trends (most common issues)
- LanceDB browser (view approved tests)
- Learned rules list (edit/delete rules)

**Depends on:** F046 (FastAPI Web Server)