fix: v0.2.6 主进程异步收尾与边角防护 - 保存报告异步写盘、拖拽解码handler异步化、空白粘贴拦截、超多行卡顿预警、清理mac无效签名配置、文档与测试同步

src/main/index.ts

@@ -115,7 +115,7 @@ ipcMain.handle('file:open', async (_event, side: 'left' | 'right' | null) => {
 })
 
 /** IPC: 解码拖拽传入的原始字节（复用编码探测逻辑） */
-ipcMain.handle('file:decode-buffer', (_event, buffer: ArrayBuffer) => {
+ipcMain.handle('file:decode-buffer', async (_event, buffer: ArrayBuffer) => {
   return decodeText(Buffer.from(buffer))
 })
 
@@ -131,7 +131,8 @@ ipcMain.handle('file:save-report', async (_event, content: string, defaultName:
     ]
   })
   if (result.canceled || !result.filePath) return { ok: false, path: null }
-  fs.writeFileSync(result.filePath, content, 'utf-8')
+  // 异步写盘，避免大报告（MB 级 HTML）同步写入时阻塞主进程事件循环
+  await fs.promises.writeFile(result.filePath, content, 'utf-8')
   return { ok: true, path: result.filePath }
 })