Improve Actions panel aesthetics to match eval/enrichment panels

[Copilot]

The Actions panel (action-results-panel.tsx) lagged behind eval/enrichment panels in polish — no per-item rerun, no collapsible rows, no copy button on output, dense header badges, and an inconsistent amber icon.

Changes

Per-item collapsible details

• ActionResultGroup now uses a ChevronRight expand/collapse toggle (collapsed by default) matching EvalResultRow's pattern
• Message, output, and data are hidden until expanded; keyboard accessible (role="button", tabIndex, onKeyDown)

Output block polish

• <pre> block now has an "Output" label header with a hover-revealed CopyButton (matches eval panel's expandable text copy pattern)

Data key-value grouping

• Wrapped in bg-muted/30 rounded p-2 card instead of plain pl-1 grid, adding visual separation

Per-item re-run

• Both ActionErrorRow and ActionResultGroup now expose a RefreshCw re-run button; passes forceRefresh: true to runSingle
• Eliminates the need to "Run All" just to retry one item

Header badge consistency

• Restructured to gap-3 with explicit labels: "N succeeded", "N errored" — matches eval panel's stat layout

Icon color

• Zap changed from text-amber-500 → text-primary to align with BarChart3 (evals) and Database (enrichments)

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation

Checklist

• npm run lint passes
• npx tsc --noEmit passes
• npm run test:run passes
• npm run build succeeds

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