feat: add area diagnostics

apps/web/src/lib/api.ts

@@ -332,11 +332,33 @@ export type AreaMonthlyMetric = {
   raw_artifact_id: number | null;
 };
 
+export type DiagnosticMetric = {
+  key: string;
+  label: string;
+  unit: string;
+  current_value: number;
+  percentile: number;
+  historical_min: number;
+  historical_max: number;
+  sample_size: number;
+  anomaly: boolean;
+  anomaly_direction: string | null;
+  severity: string;
+};
+
+export type AreaDiagnostics = {
+  area_id: string;
+  month: string;
+  metrics: DiagnosticMetric[];
+  anomaly_count: number;
+};
+
 export type AreaDetail = {
   profile: AreaProfile;
   current_score: AreaScore | null;
   score_lineage: AreaScoreLineage | null;
   monthly_metrics: AreaMonthlyMetric[];
+  diagnostics: AreaDiagnostics | null;
   neighborhood_scores: NeighborhoodScore[];
 };
 
@@ -400,6 +422,15 @@ export async function fetchAreaDetail(areaId: string, month: string): Promise<Ar
   );
 }
 
+export async function fetchAreaDiagnostics(
+  areaId: string,
+  month: string,
+): Promise<AreaDiagnostics> {
+  return fetchJson(
+    `/api/v1/areas/${encodeURIComponent(areaId)}/diagnostics?month=${encodeURIComponent(month)}`,
+  );
+}
+
 export async function fetchNeighborhoodScores(month: string): Promise<NeighborhoodScore[]> {
   return fetchJson(`/api/v1/neighborhoods/scores?month=${encodeURIComponent(month)}`);
 }