refactor: 保存预览版自动先保存源数据，简化操作一步完成

web/src/views/SitePages.vue

@@ -237,8 +237,16 @@ const fetchSnapshotStatus = async () => {
 
 const savePreview = async () => {
   savingPreview.value = true
-  try { await api.raw.post('/admin/sites/' + editSiteId.value + '/save-preview'); ElMessage.success('预览版已保存'); fetchSnapshotStatus() }
-  catch { ElMessage.error('保存预览版失败') }
+  try {
+    // 先自动保存页面配置
+    const url = editSiteId.value.startsWith('default:')
+      ? '/admin/default-pages/' + editSiteId.value.replace('default:','')
+      : '/sites/' + editSiteId.value + '/pages'
+    await api.raw.put(url, { entries: parsed.value, authType: authType.value })
+    originalJson.value = editorJson.value
+    // 再拍快照
+    await api.raw.post('/admin/sites/' + editSiteId.value + '/save-preview'); ElMessage.success('预览版已保存'); fetchSnapshotStatus()
+  } catch { ElMessage.error('保存预览版失败') }
   finally { savingPreview.value = false }
 }