Issue Description
对话框输入一段文字，在这段文字中间粘贴内容，如图，被粘贴内容，一直追加在最后面
Steps to Reproduce
Expected Behavior
Actual Behavior
Screenshots / Screen Recordings
Operating System
Current Qoder Version (Menu → About Qoder → Copy)
版本: 0.2.5
VSCode Version: 1.100.0 (user setup)
提交: 16cd366960161a956c5ec5d028a1a295e2b0529c
日期: 2025-10-10T12:08:54.752Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100
