fix: ensure Weekly Sales filters update totals and isolate products

- App.tsx: Add globalAsinMetadata to provide context for ad filtering
- dataProcessor.ts: Update filterAdsData to respect product line filters via metadata
- dataProcessor.ts: Update mergeSalesAndAdsData to use global metadata for ads-only records
- Ensures consistent calculation of totals and visibility when filtering by Line or ASIN

App.tsx

@@ -250,8 +250,21 @@ const App: React.FC = () => {
 
 
   // Derive Data
+  const globalAsinMetadata = useMemo(() => {
+    const metaMap = new Map<string, { sku: string; title: string; line: string }>();
+    rawData.forEach(r => {
+      const asin = r.asin.trim().toUpperCase();
+      const existing = metaMap.get(asin);
+      // Keep most complete title
+      if (!existing || (r.title && r.title.length > (existing.title?.length || 0))) {
+        metaMap.set(asin, { sku: r.sku, title: r.title, line: r.line });
+      }
+    });
+    return metaMap;
+  }, [rawData]);
+
   const filteredData = useMemo(() => filterData(rawData, filters), [rawData, filters]);
-  const filteredAdsData = useMemo(() => filterAdsData(adsData, filters), [adsData, filters]);
+  const filteredAdsData = useMemo(() => filterAdsData(adsData, filters, globalAsinMetadata), [adsData, filters, globalAsinMetadata]);
   const aggregatedData = useMemo(() => aggregateData(filteredData), [filteredData]);
 
   // Calculate country-aware Top 50 Best Sellers for 2025
@@ -299,8 +312,8 @@ const App: React.FC = () => {
 
   // Combine Sales & Ads Data dynamically based on current filters
   const combinedAdsData = useMemo(() => {
-    return mergeSalesAndAdsData(filteredData, filteredAdsData);
-  }, [filteredData, filteredAdsData]);
+    return mergeSalesAndAdsData(filteredData, filteredAdsData, globalAsinMetadata);
+  }, [filteredData, filteredAdsData, globalAsinMetadata]);
 
   // Derive Context Data (Product Line Context when drilling down)
   const contextAggregatedData = useMemo(() => {