Left-mouse-button custom gestures (Mouse Utilities)

### Description of the new feature / enhancement

尊敬的 PowerToys 开发团队：
我想向你们建议，在鼠标工具模块中新增鼠标左键自定义手势功能。
希望可以按住鼠标左键上下左右拖动画出相应手势，触发以下常用操作：
切换虚拟桌面
复制
粘贴
贴图
文字识别
最小化 / 调整窗口大小
触发快捷键
自定义快捷指令
同时希望增加像素拖动阈值设置，避免和正常左键拖动（选文字、拖动窗口）产生冲突；另外加入应用排除列表，可以在游戏、设计软件中禁用该手势。
这个功能会极大提升重度鼠标用户的使用效率，感谢团队的优秀开发！

*English translation:*

Dear PowerToys development team,

I'd like to suggest adding a customizable left-mouse-button gesture feature to the Mouse Utilities module. The idea is to hold the left mouse button and drag up/down/left/right to draw a gesture that triggers common actions such as:

- Switch virtual desktop
- Copy
- Paste
- Pin/sticker (Crop and Lock / image pin)
- Text recognition (OCR)
- Minimize / resize window
- Trigger a keyboard shortcut
- Run a custom command/shortcut

I'd also like a configurable pixel drag-threshold setting to avoid conflicts with normal left-button drags (selecting text, dragging windows), plus an application exclusion list so the gesture can be disabled in games or design software.

This feature would greatly improve productivity for heavy mouse users. Thanks for the team's great work!

### Scenario when this would be used?

日常办公

*English translation:* Daily office work.

### Supporting information

No response

The issue names the Mouse Utilities module but no files, tests, or entry points. Start by locating that module and its current mouse-input behavior; clarify the gesture actions, drag threshold, and application exclusion rules, then define completion criteria with the maintainers before implementation.

Written by the indexing model from the issue text.