[Bug]: Prompting to fix the found issues in a review fails due to missing context

### Platform

Linux

### Operating system version

Ubuntu 24.04

### System architecture

Intel (x86)

### PolyScope Version

0.15

### Bug description

When continuing a chat in the review, the context (and result of the review) is missing. The AI instead looks in the repo and searches for a PR rather than looking at the review result.

### Steps to reproduce

1. Use a model to review the code.
2. A review tab opens
3. Reply in the review tab when the review is done with something like "fix it".
4. The model does not know about the review and tries to look for feedback in a PR.

### Relevant log output

```shell

```

报告没有指出文件、测试或入口点；首先定位 review-tab 聊天流程，以及 review 结果传入 continuation 的位置。在 Linux/Ubuntu 24.04 上使用 PolyScope 0.15 重现这些步骤，并验证回复 "fix it" 后会保留 review 上下文，而不是搜索 PR。

由索引模型根据 Issue 内容生成。