feat(pricing): discount quantity story

libs/pricing/src/components/cart-summary/cart-summary.component.stories.ts

@@ -57,6 +57,8 @@ export default {
                   return "Your next charge is for";
                 case "dueOn":
                   return "due on";
+                case "premiumMembershipDiscount":
+                  return "Premium membership discount";
                 default:
                   return key;
               }
@@ -342,6 +344,35 @@ export const WithAmountDiscount: Story = {
   },
 };
 
+export const WithQuantityDiscount: Story = {
+  args: {
+    cart: {
+      passwordManager: {
+        seats: {
+          quantity: 5,
+          translationKey: "members",
+          cost: 50.0,
+          hideBreakdown: true,
+        },
+        additionalStorage: {
+          quantity: 2,
+          translationKey: "additionalStorageGB",
+          cost: 10.0,
+          hideBreakdown: true,
+        },
+      },
+      cadence: "monthly",
+      discount: {
+        type: DiscountTypes.AmountOff,
+        value: 3.0,
+        quantity: 1,
+        translationKey: "premiumMembershipDiscount",
+      },
+      estimatedTax: 10.8,
+    } satisfies Cart,
+  },
+};
+
 export const WithHiddenBreakdown: Story = {
   name: "Hidden Cost Breakdown",
   args: {