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_

macOSデスクトップアプリの応答生成ビューから始め、長い応答を生成するプロンプトでこの動作を再現します。テキストがストリーミングされている間にユーザーが上へスクロールすると何が起こるかを確認します。上へスクロールすると自動スクロールが停止し、ユーザーが自分でビューを動かすまでビューが安定した状態に保たれれば完了です。

索引モデルが issue の本文から書いたものです。