fix: 桌面导出改用 IPC 直写（另存为对话框），设置页显示版本号

intern-log/electron/main.cjs

@@ -1,5 +1,6 @@
-const { app, BrowserWindow, Menu, shell, dialog } = require('electron')
+const { app, BrowserWindow, Menu, shell, dialog, ipcMain } = require('electron')
 const path = require('path')
+const fs = require('fs')
 
 const DEV_URL = process.env.VITE_DEV_SERVER_URL || ''
 
@@ -16,6 +17,7 @@ function createWindow() {
     webPreferences: {
       contextIsolation: true,
       nodeIntegration: false,
+      preload: path.join(__dirname, 'preload.cjs'),
       spellcheck: false
     }
   })
@@ -45,6 +47,18 @@ function createWindow() {
   }
 }
 
+// 导出文件：渲染进程请求主进程保存（标准另存为对话框 + 直接写盘）
+ipcMain.handle('export-file', async (event, payload) => {
+  const win = BrowserWindow.fromWebContents(event.sender)
+  const result = await dialog.showSaveDialog(win, {
+    title: '保存文件',
+    defaultPath: path.join(app.getPath('downloads'), payload.filename)
+  })
+  if (result.canceled || !result.filePath) return { saved: false, path: '' }
+  fs.writeFileSync(result.filePath, payload.content, 'utf-8')
+  return { saved: true, path: result.filePath }
+})
+
 app.whenReady().then(() => {
   createWindow()
   app.on('activate', () => {