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/src/lib/csv.ts

@@ -1,16 +1,24 @@
+import { Capacitor } from '@capacitor/core'
+
 function csvCell(v: string | number | null | undefined): string {
   const s = v == null ? '' : String(v)
   return '"' + s.replace(/"/g, '""') + '"'
 }
 
-// 导出 UTF-8 BOM 的 CSV，Excel 可直接打开中文不乱码
-export function downloadCsv(filename: string, rows: (string | number | null | undefined)[][]): void {
+// 导出 UTF-8 BOM 的 CSV，Excel 可直接打开中文不乱码；返回落盘位置（原生平台）
+export async function downloadCsv(filename: string, rows: (string | number | null | undefined)[][]): Promise<string> {
   const content = rows.map(r => r.map(csvCell).join(',')).join('\r\n')
-  const blob = new Blob(['\ufeff' + content], { type: 'text/csv;charset=utf-8' })
+  const text = '\ufeff' + content
+  if (Capacitor.isNativePlatform()) {
+    const { downloadText } = await import('./download')
+    return downloadText(filename, text)
+  }
+  const blob = new Blob([text], { type: 'text/csv;charset=utf-8' })
   const url = URL.createObjectURL(blob)
   const a = document.createElement('a')
   a.href = url
   a.download = filename
   a.click()
-  URL.revokeObjectURL(url)
+  window.setTimeout(() => URL.revokeObjectURL(url), 10000)
+  return ''
 }

intern-log/src/lib/download.ts

@@ -1,9 +1,38 @@
-export function downloadText(filename: string, text: string): void {
+import { Capacitor } from '@capacitor/core'
+
+// 导出文本文件：返回落盘位置（原生平台返回文件 URI；浏览器返回空串）
+// 原生环境写入公共文档目录，失败时回退应用缓存目录
+export async function downloadText(filename: string, text: string): Promise<string> {
+  if (Capacitor.isNativePlatform()) {
+    const { Filesystem, Directory, Encoding } = await import('@capacitor/filesystem')
+    try {
+      const r = await Filesystem.writeFile({
+        path: filename,
+        data: text,
+        directory: Directory.Documents,
+        encoding: Encoding.UTF8,
+        recursive: true
+      })
+      return r.uri
+    } catch {
+      const r = await Filesystem.writeFile({
+        path: filename,
+        data: text,
+        directory: Directory.Cache,
+        encoding: Encoding.UTF8,
+        recursive: true
+      })
+      return r.uri
+    }
+  }
+
   const blob = new Blob([text], { type: 'text/plain;charset=utf-8' })
   const url = URL.createObjectURL(blob)
   const a = document.createElement('a')
   a.href = url
   a.download = filename
   a.click()
-  URL.revokeObjectURL(url)
+  // 延迟释放，避免立即 revoke 导致下载被取消
+  window.setTimeout(() => URL.revokeObjectURL(url), 10000)
+  return ''
 }