fix: 全局快捷键被占用时增加提示

[zmdyy0318]

close MaaEnd/MaaEnd#4395
opus5.0

[sourcery-ai]

嗨，我在这里给出了一些整体性的反馈：

• 在全局快捷键注册的错误处理逻辑中，你可以复用之前获取到的 register/isRegistered 实例，从而避免额外的 getGlobalShortcut() 调用，这会简化逻辑并减少冗余的异步操作。

给 AI 代理的提示

请根据这次代码审查中的评论进行修改：

## 总体评论
- 在全局快捷键注册的错误处理逻辑中，你可以复用之前获取到的 `register`/`isRegistered` 实例，从而避免额外的 `getGlobalShortcut()` 调用，这会简化逻辑并减少冗余的异步操作。

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Original comment in English

Hey - I've left some high level feedback:

• In the global shortcut registration error handling, you can avoid the extra getGlobalShortcut() call by reusing the register/isRegistered instance obtained earlier, which will simplify the logic and reduce redundant async work.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In the global shortcut registration error handling, you can avoid the extra `getGlobalShortcut()` call by reusing the `register`/`isRegistered` instance obtained earlier, which will simplify the logic and reduce redundant async work.

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