[BUG] /tui mode switching causes cursor to disappear and breaks mouse wheel

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?

After switching TUI renderer with /tui fullscreen or /tui default, the cursor disappears completely from the screen.
It can only be found by pressing arrow keys — it has jumped to the bottom-right corner of the terminal.
Additionally, mouse wheel scrolling stops working in fullscreen mode after the switch (it works fine before any /tui command is issued).

What Should Happen?

Cursor should remain at the input prompt after mode switch. Mouse wheel scrolling should continue to work in fullscreen mode after switching.

Error Messages/Logs

Steps to Reproduce

1. Start claude in Windows Terminal (version 2.1.150)
2. Confirm mouse wheel scrolling works in the default TUI mode
3. Type /tui fullscreen and press Enter
4. Observe: cursor disappears completely from the screen
5. Press arrow keys to locate cursor — it has jumped to the bottom-right corner
6. Try mouse wheel scrolling — it no longer responds
7. Type /tui default and press Enter
8. Observe: cursor disappears again, same bottom-right corner behavior

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.150

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Before any /tui command is issued, both mouse wheel scrolling and PgUp/PgDn work perfectly in the initial default
mode. The bug only manifests AFTER switching modes with /tui.

Tested on Windows 11 Pro 10.0.26200, Windows Terminal v1.22.