feat(wms/delivery): 改进发货单页面布局和交互

添加可拖拽分割线调整表格和详情区域高度
固定顶部操作栏和表格区域滚动
优化页面整体样式和用户体验

klp-ui/src/views/wms/delivery/components/detailTable.vue

@@ -1,7 +1,8 @@
 <template>
-  <div v-loading="loading">
+  <div v-loading="loading" style="position: relative; top: 0; background-color: #f5f7fa;">
     <div v-if="waybillId">
-      <el-row :gutter="10" class="mb8">
+      <!-- 这一部分始终定在最上方 -->
+      <el-row :gutter="10" class="mb8" style="position: sticky; top: 0; z-index: 10000; padding: 10px; background-color: #fff;">
         <el-col :span="2" style="font-weight: 900;">发货单明细</el-col>
         <el-col :span="1.5">
           <el-button type="primary" plain icon="el-icon-plus" size="mini" @click="handleAdd">新增</el-button>