前端全局：<el-select remote> 三道防线扩展到 BOM 配方/采购/采购入库/售后入库

- 第一道防线：<el-select> 模板显式补充 reserve-keyword="true" / default-first-option="true"，覆盖 4 文件 5 实例

- 第二道防线：handleRemoteSearch / handleSearchMaterial 首行深度净化 query（零宽字符/控制字符/BOM/不可见 Unicode）

- 第三道防线：handleVisibleChange / handleMaterialDropdownVisible 加竞态守卫，已有 searchKeyword 或 options 非空时跳过默认列表加载；带 debounce 的场景主动 clearTimeout 互斥

- service.vue 原本缺少 searchKeyword 状态，本轮新增 ref('') 专供 el-select 守卫使用

- BomManage.vue 父件/子件共用 handleVisibleChange，两套守卫分别按 parentQueryParams.keyword 和 state.queryParams.keyword 隔离判断

inventory-web/src/views/purchase/index.vue

@@ -64,7 +64,7 @@
     />
 
     <!-- ========== 新建/编辑弹窗 ========== -->
-    <el-dialog v-model="formDialogVisible" :title="dialogTitle" width="700px" destroy-on-close :close-on-click-modal="false">
+    <el-dialog v-model="formDialogVisible" :title="dialogTitle" width="700px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form ref="formRef" :model="form" label-width="110px">
 
         <el-row :gutter="20">
@@ -74,14 +74,14 @@
                   v-model="materialBaseId"
                   filterable
                   remote
-                  reserve-keyword
+                  reserve-keyword="true"
                   clearable
                   placeholder="输入名称或规格搜索..."
                   :remote-method="handleSearchMaterialDebounced"
                   :loading="searchLoading"
                   style="width: 100%"
                   @change="onMaterialSelected"
-                  default-first-option
+                  default-first-option="true"
                   popper-class="long-dropdown"
                   v-loadmore="handleLoadMoreMaterials"
                   @visible-change="onMaterialDropdownVisibleChange"
@@ -171,7 +171,7 @@
     </el-dialog>
 
     <!-- ========== 详情弹窗 ========== -->
-    <el-dialog v-model="detailDialogVisible" title="采购申请详情" width="700px" destroy-on-close>
+    <el-dialog v-model="detailDialogVisible" title="采购申请详情" width="700px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-descriptions :column="2" border>
         <el-descriptions-item label="申请单号">{{ detail.request_no }}</el-descriptions-item>
         <el-descriptions-item label="状态">
@@ -215,7 +215,7 @@
     </el-dialog>
 
     <!-- ========== 驳回原因弹窗 ========== -->
-    <el-dialog v-model="rejectDialogVisible" title="驳回申请" width="480px" destroy-on-close>
+    <el-dialog v-model="rejectDialogVisible" title="驳回申请" width="480px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form label-width="80px">
         <el-form-item label="申请单号">
           <span style="font-weight: bold; color: #409EFF;">{{ currentRejectRow?.request_no }}</span>
@@ -396,14 +396,17 @@ const handleSearchMaterialDebounced = (query: string) => {
 }
 
 const handleSearchMaterial = async (query: string) => {
+  // 防御性处理：粘贴场景常混入零宽字符 / 控制字符 / 不可见 Unicode
+  const rawQuery = String(query || '')
+  const safeQuery = rawQuery.replace(/[\x00-\x1F\x7F-\x9F\u200B-\u200D\uFEFF]/g, '').trim()
   searchLoading.value = true
-  searchKeyword.value = query
+  searchKeyword.value = safeQuery
   searchPage.value = 1
   materialOptions.value = []
   hasNextPage.value = true
 
   try {
-    const res: any = await searchMaterialPurchase(query, 1)
+    const res: any = await searchMaterialPurchase(safeQuery, 1)
     materialOptions.value = res.data || []
     hasNextPage.value = res.has_next !== false
   } finally {
@@ -431,9 +434,14 @@ const handleLoadMoreMaterials = async () => {
 }
 
 const onMaterialDropdownVisibleChange = (visible: boolean) => {
-  if (visible && materialOptions.value.length === 0) {
-    handleSearchMaterial('')
-  }
+  if (!visible) return
+  // 防御性拦截：竞态条件守卫
+  // 如果当前已经有搜索关键字（例如用户刚刚粘贴了内容、remote-method 已经设置了 searchKeyword），
+  // 绝对不要去请求默认列表，否则会清空 searchKeyword、覆盖正确结果。
+  if (searchKeyword.value || materialOptions.value.length > 0) return
+  // 打断正在排队的 debounce 定时器，避免与默认请求相互打架
+  if (searchTimer) { clearTimeout(searchTimer); searchTimer = null }
+  handleSearchMaterial('')
 }
 
 const onMaterialSelected = (id: number | null) => {