[BUG] Title: Window resize resets scroll position to top

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description:

When resizing the Claude Code window, the scroll position jumps back to the start of the conversation instead of maintaining the current reading position.

Actual behaviour:
The view jumps to the top of the conversation, requiring manual scrolling back to the previous reading position.

Impact:
This disrupts the reading flow, particularly when frequently adjusting window size or working with tiled window managers.

What Should Happen?

Expected behaviour:
The scroll position should remain at or near the content that was visible before resizing, maintaining the user's reading context.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Open Claude Code with a conversation that extends beyond the visible viewport
2. Scroll down to read content further in the conversation
3. Resize the window (either width or height)

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

v2.1.1

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_