fix(erp-frontend-vue): resolve TypeScript build errors (duplicate ids, unused vars, null guards, type mismatches)

Made-with: Cursor

erp-frontend-vue/src/views/Purchasing/Order/form.vue

@@ -722,6 +722,7 @@ function handleSelectItem(selected: MdItem) {
   const idx = editingLineIndex.value
   if (idx < 0 || !form.lines) return
   const row = form.lines[idx]
+  if (!row) return
   row.itemId = selected.itemId ?? 0
   row.itemCode = selected.itemCode ?? ''
   row.itemName = selected.itemName ?? ''

erp-frontend-vue/src/views/Purchasing/Order/index.vue

@@ -182,8 +182,7 @@ import {
   unapprovePurchaseOrder,
   STATUS_MAP,
   BUSINESS_STATUS_MAP,
-  type PurchaseOrder,
-  type PurchaseOrderQuery
+  type PurchaseOrder
 } from '@/api/purchaseOrder'
 
 const router = useRouter()