feat: replace Vendor tab with BSR tracker

types.ts

@@ -280,6 +280,17 @@ export interface VendorCSVRow {
   'Glance Views': string;
 }
 
+export interface BSRRecord {
+  week: number;
+  market: string;
+  asin: string;
+  topLevelBSR: number | null;
+  topLevelName: string | null;
+  detailLevelBSR: number | null;
+  detailLevelName: string | null;
+  avgRating: number | null;
+}
+
 // Experiment Tracking Types
 export type ExperimentType = 'pricing' | 'advertising' | 'content' | 'promotion' | 'seo';
 export type ExperimentStatus = 'planned' | 'active' | 'completed' | 'paused';