The UI needs to have the ability to split into multiple windows due to not fi...

The UI needs to have the ability to split into multiple windows due to not fitting into one large screen. If i open all panels, having sidebar open, having chat pane open, having file tree and file open it all gets very tight. Having the right side panel being able to be open in a new window (able to move to a secondary monitor) would help alot.

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| Field | Value |
| --- | --- |
| App version | 1.1.14 |
| OS | Windows 10.0.26100 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 15 |

从 /chat 入口开始，检查侧边栏、聊天窗格、文件树、文件视图和右侧面板是如何组合的。明确多窗口行为和对辅助显示器的预期，然后定义在 Windows 上单独打开右侧面板的验收检查，同时确保现有面板仍可使用。

由索引模型根据 Issue 内容生成。