feat: Implement core grid state management with Zustand, define grid data types, and introduce a heatmap cell component.

src/features/grid/components/floating-summary-bar.tsx

@@ -145,6 +145,10 @@ export function FloatingSummaryBar() {
             </div>
 
             <div className="flex space-x-12 items-center">
+                <Stat
+                    label="Nombre de Produits"
+                    value={summary.totalProducts.toLocaleString("fr-FR")}
+                />
                 <Stat
                     label="Volume Total Vendu"
                     value={Math.round(summary.totalQuantite).toLocaleString("fr-FR")}