Add Buy Box Lost detection feature with visual warning badges

types.ts

@@ -225,3 +225,9 @@ export interface ProductForecastData {
   avgWeeklySales: number; // Added for Weeks of Coverage
   monthlyData: Record<string, MonthlyForecastPoint>;
 }
+
+export interface BuyBoxLostData {
+  asin: string;
+  countries: string[];  // ['DE', 'FR', 'IT', 'UK', 'ES']
+  reasons: Record<string, string>;  // { DE: 'Amazon', FR: 'Unknown' }
+}