Add QA evidence drilldown

frontend/src/components/quality/QualityResultsPanel.tsx

@@ -42,6 +42,14 @@ function qualityMetricValue(metric: MetricRead | undefined): string {
   return Number.isInteger(value) ? String(value) : value.toFixed(3)
 }
 
+function metricByKey(check: QualityCheckRead | null, metricKey: string): MetricRead | undefined {
+  return check?.metrics.find((metric) => metric.metric_key === metricKey)
+}
+
+function formatQualityTimestamp(value?: string | null): string {
+  return value || 'n/a'
+}
+
 function qualityMatchesSearch(check: QualityCheckRead, query: string, datasetNameById: Map<string, string>): boolean {
   const normalizedQuery = query.trim().toLowerCase()
   if (!normalizedQuery) {
@@ -78,6 +86,7 @@ export function QualityResultsPanel({
   const [qualityStatusFilter, setQualityStatusFilter] = useState('all')
   const [qualityTypeFilter, setQualityTypeFilter] = useState('all')
   const [qualitySearchQuery, setQualitySearchQuery] = useState('')
+  const [selectedQualityCheckId, setSelectedQualityCheckId] = useState<string | null>(null)
   const completedChecks = qualityChecks.filter((check) => check.status === 'ok' || check.status === 'completed').length
   const latestCheck = qualityChecks[0] ?? null
   const datasetNameById = useMemo(() => {
@@ -89,6 +98,16 @@ export function QualityResultsPanel({
   }, [candidateDatasets, referenceDatasets])
   const latestCandidateName = latestCheck?.candidate_dataset_id ? datasetNameById.get(latestCheck.candidate_dataset_id) : null
   const latestReferenceName = latestCheck?.reference_dataset_id ? datasetNameById.get(latestCheck.reference_dataset_id) : null
+  const selectedQualityCheck = useMemo(
+    () => qualityChecks.find((check) => check.id === selectedQualityCheckId) ?? latestCheck,
+    [latestCheck, qualityChecks, selectedQualityCheckId],
+  )
+  const selectedCandidateName = selectedQualityCheck?.candidate_dataset_id
+    ? datasetNameById.get(selectedQualityCheck.candidate_dataset_id) ?? selectedQualityCheck.candidate_dataset_id
+    : 'n/a'
+  const selectedReferenceName = selectedQualityCheck
+    ? datasetNameById.get(selectedQualityCheck.reference_dataset_id) ?? selectedQualityCheck.reference_dataset_id
+    : 'n/a'
   const qualityStatuses = useMemo(() => Array.from(new Set(qualityChecks.map((check) => check.status))).sort(), [qualityChecks])
   const qualityTypes = useMemo(() => Array.from(new Set(qualityChecks.map((check) => check.check_type))).sort(), [qualityChecks])
   const filteredQualityChecks = useMemo(
@@ -154,6 +173,95 @@ export function QualityResultsPanel({
           </div>
         </div>
 
+        <div className="quality-drilldown-surface" aria-label="QA/QC evidence drilldown">
+          <div className="panel-title-row">
+            <div>
+              <h3>QA/QC evidence drilldown</h3>
+              <p className="muted">Inspect the persisted check, metric evidence and dataset handoff context before exporting or sharing results.</p>
+            </div>
+            <button
+              type="button"
+              className="secondary-action"
+              onClick={() => setSelectedQualityCheckId(latestCheck?.id ?? null)}
+              disabled={!latestCheck}
+            >
+              Inspect latest check
+            </button>
+          </div>
+          {selectedQualityCheck ? (
+            <>
+              <div className="quality-drilldown-grid">
+                <div>
+                  <span>Selected check</span>
+                  <strong>{selectedQualityCheck.check_type}</strong>
+                  <p>{selectedQualityCheck.id}</p>
+                </div>
+                <div>
+                  <span>Candidate layer</span>
+                  <strong>{selectedCandidateName}</strong>
+                  <p>{selectedQualityCheck.candidate_dataset_id ?? 'candidate not stored'}</p>
+                </div>
+                <div>
+                  <span>Reference layer</span>
+                  <strong>{selectedReferenceName}</strong>
+                  <p>{selectedQualityCheck.reference_dataset_id}</p>
+                </div>
+                <div>
+                  <span>Analysis run</span>
+                  <strong>{selectedQualityCheck.analysis_run_id ?? 'n/a'}</strong>
+                  <p>Job: {selectedQualityCheck.job_id ?? 'n/a'}</p>
+                </div>
+                <div>
+                  <span>Status</span>
+                  <strong>{selectedQualityCheck.status}</strong>
+                  <p>Score: {selectedQualityCheck.score ?? 'n/a'}</p>
+                </div>
+                <div>
+                  <span>Completed</span>
+                  <strong>{formatQualityTimestamp(selectedQualityCheck.completed_at)}</strong>
+                  <p>Created: {formatQualityTimestamp(selectedQualityCheck.created_at)}</p>
+                </div>
+              </div>
+              <div className="quality-evidence-token-grid">
+                <div>
+                  <span>False positive evidence</span>
+                  <strong>{qualityMetricValue(metricByKey(selectedQualityCheck, 'false_positive_count'))}</strong>
+                  <p>Candidate geometries not matched to the reference layer.</p>
+                </div>
+                <div>
+                  <span>False negative evidence</span>
+                  <strong>{qualityMetricValue(metricByKey(selectedQualityCheck, 'false_negative_count'))}</strong>
+                  <p>Reference geometries not matched by the candidate layer.</p>
+                </div>
+                <div className="quality-evidence-map-handoff">
+                  <span>Map evidence handoff</span>
+                  <strong>{selectedCandidateName} / {selectedReferenceName}</strong>
+                  <p>Use the candidate and reference datasets as map layers for spatial review.</p>
+                </div>
+              </div>
+              <div className="quality-provenance-grid">
+                <div>
+                  <span>Parameters</span>
+                  <pre className="quality-provenance-pre">
+                    {JSON.stringify(selectedQualityCheck.parameters_json ?? {}, null, 2)}
+                  </pre>
+                </div>
+                <div>
+                  <span>Findings</span>
+                  <pre className="quality-provenance-pre">
+                    {JSON.stringify(selectedQualityCheck.findings_json ?? {}, null, 2)}
+                  </pre>
+                </div>
+              </div>
+            </>
+          ) : (
+            <div className="result-state result-state-empty">
+              <strong>No QA/QC check selected.</strong>
+              <p>Run or load a persisted QA/QC check to inspect metric and map evidence.</p>
+            </div>
+          )}
+        </div>
+
         <div className="quality-control-surface" aria-label="QA/QC refresh and filters">
           <div className="button-row">
             <button
@@ -273,6 +381,11 @@ export function QualityResultsPanel({
                     {check.status}
                   </span>
                 </div>
+                <div className="quality-check-actions">
+                  <button type="button" className="secondary-action" onClick={() => setSelectedQualityCheckId(check.id)}>
+                    Inspect check
+                  </button>
+                </div>
                 <div className="quality-score-row">
                   <div>
                     <span>Score</span>