fix: restrict order quantity edits to pending orders

apps/api/src/orders/order-status.ts

@@ -1,7 +1,7 @@
 import type { OrderStatus } from "@orderops/shared/order-status";
 
 export function canEditOrderItems(status: OrderStatus) {
-  return status === "pending" || status === "processing";
+  return status === "pending";
 }
 
 export function canEditShippingAddress(status: OrderStatus) {

apps/web/src/orders/order-items-panel.tsx

@@ -51,7 +51,11 @@ export function OrderItemsPanel({ order, onUpdateQuantity }: OrderItemsPanelProp
                 <div className="text-sm text-slate-600">{item.sku}</div>
                 <div className="text-sm text-slate-500">Available: {item.availableQuantity}</div>
               </div>
+              {order.status === "pending" ? (
                 <QuantityForm itemId={item.id} quantity={item.quantity} onSave={onUpdateQuantity} />
+              ) : (
+                <div className="text-sm text-slate-600">Quantity: {item.quantity}</div>
+              )}
             </div>
           </div>
         ))}