[BUG]Chinese IME candidate window position incorrect in Warp Terminal

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?

When using Claude Code in Warp Terminal, the Chinese Input Method Editor (IME) candidate window appears far away from the cursor position. This makes
it very difficult to type Chinese characters.

What Should Happen?

Environment

• Claude Code version: 2.1.86
• Terminal: Warp Terminal v0.2026.03.18.08.24.stable_03
• OS: macOS (Darwin 25.3.0)
• TERM: xterm-256color

Steps to Reproduce

1. Open Claude Code in Warp Terminal
2. Switch to Chinese IME (e.g., Pinyin input)
3. Start typing Chinese characters
4. Observe the candidate window position

Expected Behavior

The IME candidate window should appear near the cursor, similar to how it works in:

• Terminal.app (Apple's default terminal)
• iTerm2
• Other TUI applications like opencode running in the same Warp Terminal

Actual Behavior

The candidate window appears far away from the cursor, making it unusable.

Additional Context

Workaround

Use Terminal.app or iTerm2 to run Claude Code (IME works correctly there).

Error Messages/Logs

Running claude doctor shows:                                                                                                                          
  ERROR Raw mode is not supported on the current process.stdin, which Ink uses as input stream by default.
                                                                                                                                                        
  This suggests the issue is related to the Ink framework's raw mode handling with Warp Terminal.                                                       
                                                                                                                                                        
  Related: https://github.com/vadimdemedes/ink/#israwmodesupported

Steps to Reproduce

1. Open Claude Code in Warp Terminal
2. Switch to Chinese IME (e.g., Pinyin input)
3. Start typing Chinese characters
4. Observe the candidate window position

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.86

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Warp

Additional Information

_No response_