fix: 设置页同步信息引用未定义变量导致的运行时崩溃（loadError/isSyncConfigured/autoOn）

intern-log/src/views/SettingsView.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { onMounted, ref } from 'vue'
+import { onMounted, ref, watch } from 'vue'
 import Icon from '../components/Icon.vue'
 import ConfirmDialog from '../components/ConfirmDialog.vue'
 import {
@@ -13,7 +13,7 @@ import { downloadCsv } from '../lib/csv'
 import { hhmm, parseDateStr, todayStr } from '../lib/date'
 import { computeDay } from '../domain/attendance'
 import { changeLoginPassword, deleteCurrentUser, getSession } from '../db/auth'
-import { ensureCloudBinding, getSyncBase, getSyncLastTime, syncWithStoredConfig, syncLastError, enableRealtimeSync, stopRealtime, type SyncResult } from '../sync/engine'
+import { ensureCloudBinding, getSyncBase, getSyncLastTime, isSyncConfigured, syncWithStoredConfig, syncLastError, type SyncResult } from '../sync/engine'
 import { getCloudCreds } from '../db/auth'
 import { showToast } from '../lib/toast'
 
@@ -49,10 +49,9 @@ async function loadSyncInfo() {
   syncBase.value = await getSyncBase()
   cloudUser.value = getCloudCreds()?.username || ''
   lastSync.value = await getSyncLastTime()
-  loadError.value = syncLastError.value
-  const conf = await isSyncConfigured()
-  autoOn.value = conf
+  autoSyncErr.value = syncLastError.value
 }
+watch(syncLastError, v => { autoSyncErr.value = v })
 
 
 async function saveSyncConfig() {
@@ -364,7 +363,6 @@ async function doImport() {
       </div>
       <div v-if="syncStatus" class="muted acc-line">上次同步：{{ lastSync || '--' }} · {{ syncStatus }}</div>
       <div v-if="syncError" class="form-error">{{ syncError }}</div>
-      <div v-if="autoSyncErr" class="form-error">最近自动同步失败：{{ autoSyncErr }}</div>
       <div v-if="autoSyncErr" class="form-error">最近自动同步失败：{{ autoSyncErr }}（可点「立即同步」重试）</div>
     </div>