CJK characters overflow terminal width in TUI mode

Description

kimi-code 0.31.1 TUI renders CJK (Chinese) text beyond the terminal edge. Text is not wrapped correctly — characters overflow to the right side of the terminal window and get clipped.

Environment

• kimi-code: 0.31.1
• OS: macOS 15.5 (Darwin 25.5.0, arm64)
• Terminal: Ghostty (xterm-ghostty), also reproducible in other terminals
• COLUMNS: 80
• LANG: en_US.UTF-8
• Font: Maple Mono NF CN (monospace with CJK support)

Steps to Reproduce

1. Start kimi in a terminal with 80 columns
2. Ask any question in Chinese
3. Observe that the response text overflows the right terminal edge

Expected Behavior

CJK characters should be treated as double-width (2 terminal columns each). Text should wrap correctly within terminal width, and respond to terminal resize events — just like Claude Code does with the same Ink/React TUI framework.

Actual Behavior

Text overflows to the right, gets clipped at the terminal edge. Resizing the terminal does not fix the layout.

Reference

Claude Code (same Ink-based TUI framework) handles CJK width calculation and terminal resize correctly in the same environment. This suggests the fix is within kimi-code's rendering layer, not the terminal or framework.

Screenshots

(will attach in follow-up comment)

Start by locating the TypeScript TUI rendering and layout code built with Ink/React, then reproduce the issue with Chinese input in an 80-column terminal. Done means CJK characters stay within the terminal width, wrap at the correct double-column width, and the layout responds correctly to terminal resizing.