fix: include ads-only ASINs in merge and use unfiltered rows for totals

1. Changed weekTotals to use 'rows' instead of 'filteredRows' so totals
   always show complete sums regardless of search/growth filters
2. Added second pass in mergeSalesAndAdsData to include ads records for
   ASINs that have ad spend but no corresponding sales data

components/WeeklyGrid.tsx

@@ -119,18 +119,18 @@ const WeeklyGrid: React.FC<WeeklyGridProps> = ({ data }) => {
 
     const totalPages = Math.ceil(sortedRows.length / ROWS_PER_PAGE);
 
-    // Calculate totals per week
+    // Calculate totals per week - use unfiltered 'rows' to show complete totals
     const weekTotals = useMemo(() => {
         const totals: { [weekKey: string]: { units: number, spend: number } } = {};
         weeks.forEach(week => {
-            totals[week] = filteredRows.reduce((acc, row) => {
+            totals[week] = rows.reduce((acc, row) => {
                 acc.units += (row.unitsByWeek[week] || 0);
                 acc.spend += (row.spendByWeek[week] || 0);
                 return acc;
             }, { units: 0, spend: 0 });
         });
         return totals;
-    }, [filteredRows, weeks]);
+    }, [rows, weeks]);
 
     const renderGrowth = (current: number, previous: number) => {
         if (!previous || previous === 0) return null;