Add QA evidence map overlay

frontend/src/components/quality/QualityResultsPanel.tsx

@@ -17,6 +17,9 @@ interface QualityResultsPanelProps {
   candidateDatasets: DatasetCreateResponse[]
   referenceDatasets: DatasetCreateResponse[]
   onRefresh: () => void
+  onOpenEvidenceMap?: (qualityCheckId: string) => void
+  evidenceLoading?: boolean
+  evidenceError?: string | null
 }
 
 function qualityMetricLabel(metricKey: string): string {
@@ -95,6 +98,9 @@ export function QualityResultsPanel({
   candidateDatasets,
   referenceDatasets,
   onRefresh,
+  onOpenEvidenceMap,
+  evidenceLoading = false,
+  evidenceError = null,
 }: QualityResultsPanelProps): JSX.Element {
   const [showAllQualityChecks, setShowAllQualityChecks] = useState(false)
   const [qualityStatusFilter, setQualityStatusFilter] = useState('all')
@@ -204,7 +210,21 @@ export function QualityResultsPanel({
             >
               Inspect latest check
             </button>
+            <button
+              type="button"
+              className="secondary-action"
+              onClick={() => latestCheck?.id && onOpenEvidenceMap?.(latestCheck.id)}
+              disabled={!latestCheck || evidenceLoading || !onOpenEvidenceMap}
+            >
+              {evidenceLoading ? 'Loading map evidence...' : 'Show latest on map'}
+            </button>
           </div>
+          {evidenceError ? (
+            <div className="result-state result-state-error">
+              <strong>QA/QC evidence overlay could not be loaded.</strong>
+              <p>{evidenceError}</p>
+            </div>
+          ) : null}
           {selectedQualityCheck ? (
             <>
               <div className="quality-drilldown-grid">
@@ -254,6 +274,14 @@ export function QualityResultsPanel({
                   <span>Map evidence handoff</span>
                   <strong>{selectedCandidateName} / {selectedReferenceName}</strong>
                   <p>Use the candidate and reference datasets as map layers for spatial review.</p>
+                  <button
+                    type="button"
+                    className="secondary-action"
+                    onClick={() => onOpenEvidenceMap?.(selectedQualityCheck.id)}
+                    disabled={evidenceLoading || !onOpenEvidenceMap}
+                  >
+                    {evidenceLoading ? 'Loading overlay...' : 'Show evidence overlay'}
+                  </button>
                 </div>
               </div>
               <div className="quality-feature-evidence-grid" aria-label="Feature-level QA/QC evidence">
@@ -440,6 +468,14 @@ export function QualityResultsPanel({
                   <button type="button" className="secondary-action" onClick={() => setSelectedQualityCheckId(check.id)}>
                     Inspect check
                   </button>
+                  <button
+                    type="button"
+                    className="secondary-action"
+                    onClick={() => onOpenEvidenceMap?.(check.id)}
+                    disabled={evidenceLoading || !onOpenEvidenceMap}
+                  >
+                    Show evidence on map
+                  </button>
                 </div>
                 <div className="quality-score-row">
                   <div>