Vietnamese Telex IME input broken in TUI mode

[lybinhlap]

Environment

• OS: macOS
• kiro-cli: 2.0.1
• Input method: Vietnamese Telex (macOS built-in)

Steps to Reproduce

1. Start kiro-cli chat (default TUI mode)
2. Switch to Vietnamese Telex input method
3. Type any Vietnamese word (e.g. "xin chào")

Expected Behavior

TUI mode should correctly handle IME (Input Method Editor) compose sequences, allowing users to type Vietnamese (Telex/VNI) and other multi-keystroke input methods without dropping characters.
The behavior should match classic mode, where Vietnamese Telex input works correctly.

For example, typing "xin chaof" with Telex should produce "xin chào".

Actual Behavior

Characters are dropped during the compose sequence. For example, typing "chaof" (Telex for "chào") results in missing characters like "cho" or "chao" — the diacritical composition fails and
intermediate keystrokes are lost.

This issue only occurs in TUI mode. Classic mode (--classic / --legacy-mode) handles Vietnamese Telex input correctly.

Workaround

Use kiro-cli chat --legacy-mode or kiro-cli --classic.

Root Cause (Suspected)

The new TUI (React/Ink-based) input handling does not support IME compose sequences correctly. Classic mode uses Rust-based readline which handles IME properly.