feat(checkout): restore cart before modifying items

src/app/features/store/pages/checkout-page/checkout-page.component.ts

@@ -199,9 +199,28 @@ export class CheckoutPageComponent implements OnInit, OnDestroy {
     }
 
     if (editing && !this.canModifyCart()) {
-      await this.router.navigate(['/'], {
-        queryParams: { openCart: true },
-      });
+      const tenant = this.tenantService.tenant();
+      const purchaseId = this.createdPurchaseId();
+
+      if (!tenant || !purchaseId) {
+        return;
+      }
+
+      this.isPreparingItemEdit.set(true);
+      try {
+        await this.checkoutService.cancelPurchase(tenant.codigo, purchaseId);
+        this.createdPurchaseId.set(null);
+        this.createdPurchase.set(null);
+        await firstValueFrom(this.cartService.loadCart());
+        await this.router.navigate(['/'], {
+          queryParams: { openCart: true },
+        });
+      } catch (error) {
+        console.error('Failed to restore cart for editing:', error);
+      } finally {
+        this.isPreparingItemEdit.set(false);
+      }
+
       return;
     }