fix: Restore missing top50Ranking2025 definition

App.tsx

@@ -554,6 +554,37 @@ const App: React.FC = () => {
   const aggregatedData = useMemo(() => aggregateData(filteredData), [filteredData]);
   console.timeEnd('aggregatedData');
 
+  const top50Ranking2025 = useMemo(() => {
+    // Filter only 2025 data
+    const data2025 = rawData.filter(r => r.year === 2025);
+
+    const calculateTop50 = (entries: SalesRecord[]) => {
+      const asinTotals = new Map<string, number>();
+      entries.forEach(r => {
+        const asin = r.asin.trim().toUpperCase();
+        asinTotals.set(asin, (asinTotals.get(asin) || 0) + r.sellOut);
+      });
+
+      const sorted = Array.from(asinTotals.entries())
+        .sort((a, b) => b[1] - a[1])
+        .slice(0, 50);
+
+      const rankMap = new Map<string, number>();
+      sorted.forEach(([asin], index) => {
+        rankMap.set(asin, index + 1);
+      });
+      return rankMap;
+    };
+
+    const euData = data2025.filter(r => !r.customer.toLowerCase().includes('uk'));
+    const ukData = data2025.filter(r => r.customer.toLowerCase().includes('uk'));
+
+    return {
+      eu: calculateTop50(euData),
+      uk: calculateTop50(ukData)
+    };
+  }, [rawData]);
+
   const filteredBsrData = useMemo(() => filterBsrData(bsrData, deferredFilters, globalAsinMetadata, stockMap, vendorStockMap, top50Mode), [bsrData, deferredFilters, globalAsinMetadata, stockMap, vendorStockMap, top50Mode]);
 
   console.time('combinedAdsData');