feat: add Glance Views (GV) to Weekly Sales grid

- Updated WeeklyPivotRow interface and pivotWeeklySalesData to aggregate GV data per week.
- Modified WeeklyGrid.tsx to display GV next to Spend in total header and individual rows.
- Added GV sorting support in the Weekly Sales grid.

services/dataProcessor.ts

@@ -1437,6 +1437,7 @@ export interface WeeklyPivotRow {
     customer: string;
     unitsByWeek: { [weekKey: string]: number }; // Key: "YYYY-WW"
     spendByWeek: { [weekKey: string]: number }; // Key: "YYYY-WW"
+    gvByWeek: { [weekKey: string]: number }; // Key: "YYYY-WW"
 }
 
 export const pivotWeeklySalesData = (data: CombinedKPIs[]): {
@@ -1469,7 +1470,8 @@ export const pivotWeeklySalesData = (data: CombinedKPIs[]): {
                 line: record.line || '',
                 customer: record.customer || record.marketplace || '',
                 unitsByWeek: {},
-                spendByWeek: {}
+                spendByWeek: {},
+                gvByWeek: {}
             });
         }
 
@@ -1480,6 +1482,7 @@ export const pivotWeeklySalesData = (data: CombinedKPIs[]): {
             // Only add cost if we haven't already added it for this ASIN/week
             // Since mergeSalesAndAdsData now outputs one record per ASIN/week, this should be clean
             row.spendByWeek[weekKey] = (row.spendByWeek[weekKey] || 0) + (record.cost || 0);
+            row.gvByWeek[weekKey] = (row.gvByWeek[weekKey] || 0) + (record.glanceViews || 0);
         }
     });