fix(analytics): 流失页导出成功提示与空检+排序仅当前页提示

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

yunkes/src/views/analytics/ChurnView.vue

@@ -20,7 +20,7 @@
       <el-tab-pane label="从未激活" name="inactive" />
       <el-tab-pane label="待交接" name="handover" />
     </el-tabs>
-    <div class="kind-hint">{{ kindHint }}</div>
+    <div class="kind-hint">{{ kindHint }}（列排序仅当前页）</div>
 
     <el-alert v-if="error" type="error" :title="error" :closable="false" class="error-bar" />
 
@@ -150,9 +150,14 @@ function goChat(row: ChurnRow) {
 // CSV 平铺带「归属员工」列 = v1 简化:spec 的「按员工分组」语义由表格列承担
 // (spec §3.3 注)。exportListToCsv 自带全量翻页 + BOM + 10000 行安全上限。
 async function exportCsv() {
+  // 空检 + 成功条数提示:项目所有 exportListToCsv 调用点的统一 UX(CustomerList 等)
+  if (!total.value) {
+    ElMessage.warning('当前列表为空，无数据可导出')
+    return
+  }
   exporting.value = true
   try {
-    await exportListToCsv<ChurnRow>({
+    const result = await exportListToCsv<ChurnRow>({
       fetchPage: (p, size) =>
         getChurn({
           channel: channel.value,
@@ -176,6 +181,7 @@ async function exportCsv() {
       ],
       filename: `流失预警_${kind.value}_${channel.value}`,
     })
+    ElMessage.success(`已导出 ${result.rows} 条`)
   } catch (e) {
     ElMessage.error(`导出失败：${e instanceof Error ? e.message : String(e)}`)
   } finally {