[BUG] Copy button missing on hover + font size reduced (Windows Desktop App)

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?

aAfter updating Claude Code Desktop App on Windows, two regressions appeared:

1. Copy button on hover is gone — Previously, hovering over chat messages or code blocks showed a copy button (top-right corner). This no longer appears.
2. 2. Font size noticeably smaller — Text in chat responses is visibly smaller compared to the previous version.

What Should Happen?

1. Copy button should appear on hover over chat message blocks (as it did in the previous version)
2. 2. Font size should remain the same as the previous version

Error Messages/Logs

Steps to Reproduce

1. Update Claude Code Desktop App to the latest version on Windows 10
2. 2. Open any conversation and send a message
3. 3. Hover over any chat message or code block — no copy button appears (previously it showed a copy icon at top-right)
4. 4. Compare font size with previous version — text is noticeably smaller

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.56 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Additional regressions noticed:

1. Plan section at the bottom is missing — Previously there was a Plan section visible at the bottom of the chat. This is also gone after the update.

Environment: Windows 10 Home, Claude Code Desktop App

See attached before/after screenshots for comparison.