Please add "Artifacts" as a tab on the right hand pane.

Please add "Artifacts" as a tab on the right hand pane. I can see files in the repo, but when I have a big research project the app creates a lot of artifacts, but I have to open each one individually from the button at the bottom of the left pane. It would be much better to have an artifacts tab in the right pane, which had a tree view of files etc. and let me browse more easily

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| Field | Value |
| --- | --- |
| App version | 1.1.4 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 8 |

从 /chat 视图开始，检查左侧窗格底部现有的打开工件按钮，以及右侧窗格当前的选项卡和文件浏览行为。添加一个带有树视图的 Artifacts 选项卡，使用户能够浏览和打开生成的工件，而无需逐个打开；验证它在包含大量工件的项目中能够正常工作。

由索引模型根据 Issue 内容生成。