fix: 优化对话框显示状态逻辑，确保在更新错误时正确显示

src/renderer/components/UpdateDialog.vue

@@ -124,10 +124,10 @@ const downloadProgress = computed(() => appStore.downloadProgress)
 // 对话框显示状态
 const dialogVisible = computed({
   get: () => {
-    return appStore.updateDialogVisible || 
+    return appStore.updateDialogVisible ||
-           updateStatus.value.status === 'available' || 
+           updateStatus.value.status === 'available' ||
-           updateStatus.value.status === 'downloading' || 
+           updateStatus.value.status === 'downloading' ||
-           updateStatus.value.status === 'downloaded' || 
+           updateStatus.value.status === 'downloaded' ||
            (updateStatus.value.status === 'error' && !!updateStatus.value.error)
   },
   set: (value: boolean) => {
@@ -141,7 +141,7 @@ const dialogVisible = computed({
 
 const latestVersion = computed(() => {
   // 这里应该从API获取最新版本号，暂时使用固定值
-  return 'v' + (updateStatus.value.currentVersion || '1.0.0').replace(/^v?/, '').split('.').map((n, i) => 
+  return 'v' + (updateStatus.value.currentVersion || '1.0.0').replace(/^v?/, '').split('.').map((n, i) =>
     i === 2 ? (parseInt(n) + 1).toString() : n
   ).join('.')
 })
@@ -193,4 +193,3 @@ onUnmounted(() => {
   window.mainApi.off('update-download-progress', () => {})
 })
 </script>
-</template>