Merged PR 2021: feat(pickup-shelf): display Prämie label and Lesepunkte for reward items

feat(pickup-shelf): display Prämie label and Lesepunkte for reward items

- Add "Prämie" ui-label badge below product images in both list and details views
- Display Lesepunkte value instead of price for reward items
- Update getOrderItemRewardFeature helper to use structural typing for better type flexibility
- Apply to pickup-shelf-details-item and pickup-shelf-list-item components

Fixes #5467

libs/oms/data-access/src/lib/helpers/order/get-order-item-reward-feature.helper.ts

@@ -1,7 +1,17 @@
-import { OrderItemDTO, DisplayOrderItemDTO } from '@generated/swagger/oms-api';
-
+/**
+ * Extracts and parses the reward points (Lesepunkte) value from an order item's features.
+ *
+ * @param orderItem - An object containing a features property with key-value pairs
+ * @returns The parsed numeric value of reward points, or undefined if not present
+ *
+ * @example
+ * ```ts
+ * const orderItem = { features: { praemie: '12.345' } };
+ * const points = getOrderItemRewardFeature(orderItem); // returns 12345
+ * ```
+ */
 export function getOrderItemRewardFeatureHelper(
-  orderItem: OrderItemDTO | DisplayOrderItemDTO | undefined,
+  orderItem: { features?: { [key: string]: string } } | undefined,
 ): undefined | number {
   if (!orderItem || !orderItem.features) {
     return undefined;