Code Review panel layout becomes corrupted, and closing tabs can crash the application

### Short summary

_No response_

### Affected version or release

1.0.24

### Installation context

_No response_

### What happened?

I've encountered a UI/layout issue in the Copilot App that sometimes leads to an application crash.

After opening a Code Review (or similar review view), the right-hand panel occasionally becomes completely corrupted. Instead of rendering normally, multiple sections overlap each other, making the content unreadable.

The attached screenshot shows the issue clearly:

Headers overlap with issue descriptions.
Multiple review items are rendered on top of each other.
Text from different sections is mixed together.
Scrolling does not restore the layout.

In addition, after this corrupted state occurs, closing certain tabs (such as the Code Review tab or other related tabs) can cause the entire Copilot App to crash unexpectedly.

### Steps to reproduce

_No response_

### Expected behavior

The review panel should render each issue in its own layout without overlapping.
Closing tabs should never crash the application.

### Additional context

首先，在打开 Code Review 视图后，于 Copilot App 版本 1.0.24 中复现该问题，并将附带的屏幕截图作为预期的失败状态。调查 review panel 的布局，以及关闭 Code Review 或相关标签页的处理；当 review 项目能够无重叠地渲染，且关闭标签页不会导致应用程序崩溃时，即表示完成。

由索引模型根据 Issue 内容生成。