revert: 开始任务后禁止切换顶部状态栏

[zmdyy0318]

close #274 避免影响多开

Sourcery 总结

启动任务后，仍可使用顶部导航和控件。

错误修复：

• 恢复在另一个实例运行时切换标签页和使用顶部栏控件的功能，避免多个实例之间相互干扰。

增强功能：

• 移除运行中实例锁定，以及顶部导航栏的禁用样式。

Original summary in English

Summary by Sourcery

Allow top-bar navigation and controls to remain usable after starting a task.

Bug Fixes:

• Restore the ability to switch tabs and use top-bar controls while another instance is running, avoiding interference with multiple instances.

Enhancements:

• Remove the running-instance lock and disabled styling from the top navigation bar.

[sourcery-ai]

你好——我已经审阅了你的更改，看起来很棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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