✨ Handle Workspace Root Change

### Description

Handling the event where the root of the project is moved or deleted should be handled gracefully. Right now we have a TODO comment in the directory events to handle this.

What should happen when the root is moved:
- Prompt the user with a panel that covers the workspace and offer two options
- Re-locate the workspace - user selects a directory and we re-identify the current workspace to the user-specified path.
- Close the workspace - close the workspace and remove it from recently opened, etc.

从处理已移动或已删除 workspace root 的目录事件代码中的 TODO 开始。在决定 panel 应该放在哪里之前，跟踪当前如何处理 workspace 的重新定位、关闭以及最近打开的 workspace。完成标准是用户可以将 workspace 重新定位到所选目录，或关闭 workspace 并将其从最近打开的 workspace 中移除。

由索引模型根据 Issue 内容生成。