Implement Weeks of Coverage indicator for Vendor Stock

types.ts

@@ -195,6 +195,7 @@ export interface CombinedKPIs {
   cpc: number;
   cvrUnits: number;
   glanceViews: number;   // Traffic / page views
+  avgWeeklySales?: number; // Added for Weeks of Coverage
 }
 
 export interface ForecastRecord {
@@ -220,5 +221,6 @@ export interface ProductForecastData {
   actualUnits: number;
   forecastUnits: number;
   accuracy: number;
+  avgWeeklySales: number; // Added for Weeks of Coverage
   monthlyData: Record<string, MonthlyForecastPoint>;
 }