[Bugs] Chat content cut-off on an ask_user interaction

**Mood:** 😔
**Category:** Bugs

Sometimes there is new content in the chat, and an interactive question that stops the flow and waits for the input. The bug is that the content before the question is not shown in full and can't be scrolled to the end. Sometimes it's misleading because there is no indication that some context is missing. Sometimes it's clear because the question is out of visible context, but there is no way to see it, except interrupting the question.

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| Field | Value |
| --- | --- |
| App version | 1.0.15 |
| OS | macOS 26.5.1 |
| Theme | Mondrian |
| Path | /chat |
| Tenure | Week 3 |

从 /chat 路径开始，在添加足够多的内容以需要滚动后，重现一次 ask_user 交互。检查聊天视图如何处理问题之前的内容，然后验证在交互等待输入时，所有之前的内容都可见，并且可以滚动到末尾。

由索引模型根据 Issue 内容生成。