Feat: add hover tooltip on TOTALS row in Weekly Sales with WoW and YoY comparison

Shows previous week and same week prior year values (Units, Revenue, Ads Spend, GV) with % change indicators when hovering any week cell in the TOTALS row.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

components/mkt/MktDataView.tsx

@@ -90,9 +90,22 @@ function parseChargebacksExcel(buffer: ArrayBuffer): Map<string, number> {
 interface MktDataViewProps {
   rawData: SalesRecord[];
   adsData: AdsRecord[];
+  stockMap?: Map<string, number>;
+  vendorStockMap?: Map<string, { eu: number; uk: number }>;
+  top50Mode?: 'eu' | 'uk';
+  velocityMap?: Map<string, number>;
+  buyBoxLostMap?: Map<string, { countries: string[]; reasons: Record<string, string> }>;
 }
 
-export default function MktDataView({ rawData, adsData }: MktDataViewProps) {
+export default function MktDataView({ 
+  rawData, 
+  adsData,
+  stockMap,
+  vendorStockMap,
+  top50Mode = 'eu',
+  velocityMap,
+  buyBoxLostMap
+}: MktDataViewProps) {
   const [includeCOGS, setIncludeCOGS] = useState(true);
   const [selectedProduct, setSelectedProduct] = useState<Product | null>(null);
 
@@ -314,6 +327,11 @@ export default function MktDataView({ rawData, adsData }: MktDataViewProps) {
           products={filteredProducts}
           includeCOGS={includeCOGS}
           onProductClick={setSelectedProduct}
+          stockMap={stockMap}
+          vendorStockMap={vendorStockMap}
+          top50Mode={top50Mode}
+          velocityMap={velocityMap}
+          buyBoxLostMap={buyBoxLostMap}
         />
       </div>