chore(admin): final polish and QA doc

admin-frontend/src/pages/EmailPage.vue

@@ -1,5 +1,5 @@
 <script setup>
-import { computed, onMounted, reactive, ref } from 'vue'
+import { computed, onBeforeUnmount, onMounted, reactive, ref } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 
 import { cleanupEmailLogs, fetchEmailLogs, fetchEmailSettings, fetchEmailStats, updateEmailSettings } from '../api/email'
@@ -73,6 +73,11 @@ function scheduleSaveEmailSettings() {
   saveTimer = window.setTimeout(saveEmailSettings, 300)
 }
 
+onBeforeUnmount(() => {
+  if (saveTimer) window.clearTimeout(saveTimer)
+  saveTimer = null
+})
+
 // ========== SMTP 配置 ==========
 const smtpLoading = ref(false)
 const smtpConfigs = ref([])
@@ -596,7 +601,11 @@ onMounted(refreshAll)
       </div>
     </el-card>
 
-    <el-dialog v-model="smtpDialogOpen" :title="smtpEditMode ? '编辑SMTP配置' : '添加SMTP配置'" width="560px">
+    <el-dialog
+      v-model="smtpDialogOpen"
+      :title="smtpEditMode ? '编辑SMTP配置' : '添加SMTP配置'"
+      width="min(560px, 92vw)"
+    >
       <el-form label-width="120px">
         <el-form-item label="名称">
           <el-input v-model="smtpForm.name" />

admin-frontend/src/pages/StatsPage.vue

@@ -415,6 +415,16 @@ onBeforeUnmount(() => {
   color: #f59e0b;
 }
 
+@media (max-width: 768px) {
+  .task-item {
+    flex-direction: column;
+  }
+
+  .task-right {
+    align-self: flex-end;
+  }
+}
+
 .stat-grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));