Hard to read while generating response

### Short summary

Output text is hard to read while generating response because of ticking output

### Affected version or release

v1.0.17

### Installation context

macos desktop app

### What happened?

I would like to share some feedback regarding the scrolling behavior during response generation.

When I prompt the system and receive a response, the text streams (tickers) downwards. If I start reading the response while it is still generating, the continuous scrolling makes it very difficult to read.

To prevent this, I try to scroll up slightly in the hope that it will freeze the scrolling. However, the window continues to auto-scroll. This means I cannot actually start reading until the entire output is finished generating.

I would highly appreciate it if you could improve this interaction: once a user manually scrolls up while an answer is being generated, the system should detect that the user wants to start reading, stop auto-scrolling, and keep the view stable.

### Steps to reproduce

1. Prompt something with a long response
2. Try to read it
3. Observe that the output text is moving as more text is generated

### Expected behavior

Freeze scrolling when observing that user intentionally scrolls upwards to read the text.

### Additional context

_No response_

从 macOS 桌面应用的响应生成视图开始，使用一个能生成长响应的 prompt 复现该行为。观察文本流式传输时用户向上滚动会发生什么；当向上滚动停止自动滚动，并使视图保持稳定，直到用户选择移动它时，即视为完成。

由索引模型根据 Issue 内容生成。