Frontend for #1130. A maintenance tile in Settings → Tagging:
- Editable concept list + "Run eval" → POST /api/tag-eval (one running at a time).
- Rehydrates on mount via the persisted run (getRun by latest id) and polls while
running — so the report SURVIVES navigation (operator-flagged); the task runs
backend-side regardless and the card reconnects to its row.
- Renders the saved report: per-concept head-vs-centroid metrics table (AP/F1/
precision/recall) with Δ AP, the learning curve (AP @ N positives), and
thumbnail galleries (head-would-suggest / head-doubts-positive) for eyeballing.
Backend: _examples now stores thumbnail_urls (not just ids) so the report is a
self-contained artifact that renders without per-id lookups on reload.
No new top-level surface — slots into the existing maintenance area.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
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