Autocomplete suggestion list shows octal escape sequences instead of CJK characters on Windows

Description

When using Claude Code on Windows, the autocomplete/suggestion list displays CJK (Chinese/Japanese/Korean) characters as octal escape sequences instead of rendering them properly.

Steps to Reproduce

1. Create a file with Chinese characters in the filename, e.g., articles/draft/测试文章.md
2. Start typing @ or a path that would trigger autocomplete
3. Observe the suggestion list

Expected Behavior

The suggestion list should display:

articles/draft/测试文章.md

Actual Behavior

The suggestion list displays octal escape sequences:

articles/draft/\346\265\213\350\257\225\346\226\207\347\253\240.md

Environment

• OS: Windows 10/11
• Terminal: Various (Windows Terminal, VS Code integrated terminal, Git Bash)
• Terminal encoding: UTF-8 (chcp 65001)
• LANG: en_US.UTF-8

Additional Context

• The terminal itself renders CJK characters correctly (e.g., ls command output shows Chinese filenames properly)
• The issue is specifically in Claude Code's autocomplete UI rendering layer
• Selecting the garbled suggestion still works correctly - the actual path submitted is correct
• This is a display/UX issue, not a functional bug

Workaround

Users can:

• Manually type the full path
• Copy-paste paths from elsewhere
• Use ASCII-only filenames