[BUG] shift+enter do not creates an empty new line on Win WSL

Environment

• Platform (select one):
• [v] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.33
• Operating System: Windows 11 with WSL , Ubuntu 20.04
• Terminal: GNU bash, version 4.4.23(2)-release (x86_64-pc-msys)

Bug Description

shift+enter do not creates an empty new line on Win WSL

Steps to Reproduce

1. /terminal-setup
2. press shift+enter

Expected Behavior

new line is created

Actual Behavior

created a line with \ symbol

Additional Context

if we enter manually \ + enter - it will create an empty new line
it seems like this may be implemented with just empty line