fix: 修复导出下载链路（Electron 保存对话框 + 原生文件写入 + revoke 竞态）

intern-log/electron/main.cjs

@@ -1,4 +1,4 @@
-const { app, BrowserWindow, Menu, shell } = require('electron')
+const { app, BrowserWindow, Menu, shell, dialog } = require('electron')
 const path = require('path')
 
 const DEV_URL = process.env.VITE_DEV_SERVER_URL || ''
@@ -20,6 +20,20 @@ function createWindow() {
     }
   })
   Menu.setApplicationMenu(null)
+
+  // 下载接管：导出的 JSON/CSV/Markdown 弹出标准保存对话框
+  win.webContents.session.on('will-download', (event, item, webContents) => {
+    const result = dialog.showSaveDialogSync(win, {
+      title: '保存文件',
+      defaultPath: path.join(app.getPath('downloads'), item.getFilename())
+    })
+    if (!result) {
+      event.preventDefault()
+      return
+    }
+    item.setSavePath(result)
+  })
+
   win.webContents.setWindowOpenHandler(({ url }) => {
     if (/^https?:/i.test(url)) shell.openExternal(url)
     return { action: 'deny' }