Add QA evidence drilldown

frontend/README.md

@@ -271,6 +271,7 @@ Detection Lab and Segmentation Lab now share the same AI workspace hierarchy: mo
 - The Data catalog shows a compact selected/reference/candidate/source summary and scan-friendly badges. Persisted `reference` datasets are shown as Reference, non-reference vector/GeoJSON layers are shown as QA Candidates for workbench scanning, and raster/other uploads remain Source.
 - Dataset cards explain the recommended next action and use compact two-line action buttons for inspect, map, export/QA and metadata refresh. Disabled actions keep a visible reason, such as `Vector/GeoJSON only`.
 - The QA/QC workspace shows candidate/reference handoff cards and resolves persisted quality-check dataset IDs back to dataset names when the datasets are loaded in the current project context.
+- The QA/QC workspace includes a selected-check evidence drilldown with candidate/reference provenance, false-positive/negative metric evidence, map handoff context and parameters/findings JSON.
 
 ## Raster dependency visibility
 

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>

frontend/src/styles/app.css

@@ -1483,6 +1483,7 @@ button.entity-card {
 
 .quality-summary-surface,
 .quality-evidence-surface,
+.quality-drilldown-surface,
 .quality-control-surface,
 .quality-history-surface {
   min-width: 0;
@@ -1500,6 +1501,21 @@ button.entity-card {
   background: #f8fbf9;
 }
 
+.quality-drilldown-surface {
+  display: grid;
+  gap: 0.72rem;
+  background: linear-gradient(180deg, #ffffff, #f7fbf8);
+}
+
+.quality-drilldown-surface .panel-title-row {
+  align-items: start;
+}
+
+.quality-drilldown-surface .panel-title-row button {
+  width: auto;
+  min-height: 2.35rem;
+}
+
 .quality-control-surface,
 .quality-history-surface {
   display: grid;
@@ -1600,6 +1616,14 @@ button.entity-card {
   margin: 0;
 }
 
+.quality-drilldown-grid,
+.quality-evidence-token-grid,
+.quality-provenance-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
+  gap: 0.58rem;
+}
+
 .quality-summary-grid > div {
   border: 1px solid var(--line);
   border-radius: 8px;
@@ -1615,8 +1639,31 @@ button.entity-card {
   background: #ffffff;
 }
 
+.quality-drilldown-grid > div,
+.quality-evidence-token-grid > div,
+.quality-provenance-grid > div {
+  min-width: 0;
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  padding: 0.68rem;
+  background: #ffffff;
+}
+
+.quality-evidence-token-grid > div {
+  border-color: rgba(15, 118, 110, 0.22);
+  background: linear-gradient(180deg, #f8fcfa, #ffffff);
+}
+
+.quality-evidence-map-handoff,
+.quality-evidence-token-grid > div:nth-child(3) {
+  background: var(--accent-soft);
+}
+
 .quality-summary-grid span,
 .quality-handoff-grid span,
+.quality-drilldown-grid span,
+.quality-evidence-token-grid span,
+.quality-provenance-grid span,
 .quality-score-row span,
 .latest-export-card span,
 .metric-list span {
@@ -1643,6 +1690,52 @@ button.entity-card {
   line-height: 1.2;
 }
 
+.quality-drilldown-grid strong,
+.quality-evidence-token-grid strong {
+  display: block;
+  margin-top: 0.22rem;
+  overflow: hidden;
+  color: var(--ink);
+  font-size: 0.9rem;
+  line-height: 1.25;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.quality-drilldown-grid p,
+.quality-evidence-token-grid p {
+  margin: 0.24rem 0 0;
+  color: var(--muted);
+  font-size: 0.8rem;
+  line-height: 1.35;
+  overflow-wrap: anywhere;
+}
+
+.quality-provenance-pre {
+  max-height: 11rem;
+  margin: 0.38rem 0 0;
+  overflow: auto;
+  border: 1px solid var(--line);
+  border-radius: 7px;
+  padding: 0.58rem;
+  background: #0f172a;
+  color: #e2e8f0;
+  font-size: 0.75rem;
+  line-height: 1.35;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+}
+
+.quality-check-actions {
+  display: flex;
+  justify-content: flex-end;
+}
+
+.quality-check-actions button {
+  width: auto;
+  min-height: 2.15rem;
+}
+
 .quality-dataset-name,
 .quality-check-dataset-link {
   overflow-wrap: anywhere;