feat(evaluation): CSV export for dashboard data #263
Description
Summary
Add CSV export capability to the evaluation dashboard allowing ML engineers to download currently displayed evaluation metrics for offline analysis. Export includes all visible columns and respects active filters.
Deliverables
- CSV export button component in the dashboard UI
- CSV generation logic handling all visible metrics and active filters
- Client-side download implementation
- Filename convention documentation
Acceptance Criteria
- Export button downloads CSV with all visible metrics
- Columns: checkpoint_id, job_id, dataset_id, offline_mse, sim_success_rate, sim_collisions, date
- Filename convention: eval_dashboard_{timestamp}.csv
- Export respects active filters
- CSV includes header row with human-readable column names
- Handles up to 1000 rows without browser performance degradation