feat: automatic ads data loading and attributed sales line in chart

types.ts

@@ -112,6 +112,14 @@ export interface PivotRow {
   // Dynamic buckets
   totalsByYear: Record<string, YearlyData>;
   months: MonthlyPivot[]; // Always 12 elements
+
+  // Ads data (optional, aggregated by ASIN)
+  adsByYear?: Record<string, {
+    adSpend: number;
+    attributedSales: number;
+    acos: number;
+    tacos: number;
+  }>;
 }
 
 export interface TimeSeriesData {