refactor:centralize order status rules in shared package

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/orders/order-page.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from "react";
-import type { Address, AuditEvent, OrderDetail } from "@orderops/shared";
+import { canEditOrderItems, orderItemsLockedMessage, type Address, type AuditEvent, type OrderDetail } from "@orderops/shared";
 import { Link, useParams } from "react-router-dom";
 import { Toast } from "../ui/toast";
 import { cancelOrder, getOrder, listAuditEvents, updateOrderItemQuantity, updateOrderNotes, updateShippingAddress } from "./order-api";
@@ -77,8 +77,8 @@ export function OrderPage() {
       return;
     }
 
-    if (order.status !== "pending") {
-      setToast({ message: "Order items cannot be changed for this order status.", variant: "error" });
+    if (!canEditOrderItems(order.status)) {
+      setToast({ message: orderItemsLockedMessage, variant: "error" });
       return;
     }