Summary

Fix TUI input cursor/rendering behavior for wide glyphs such as Korean and CJK characters.

• Compute input cursor columns using terminal cell width instead of JavaScript string length
• Map visual columns back to string offsets for vertical cursor movement
• Add regressions for wide-character cursor placement and Korean input rendering

Verification

• bun x vitest run packages/tui/test/nodes/input.test.ts packages/tui/test/terminal/resize.test.ts
• git diff --check
• bun z build
• ./packages/cli/dist/zaly.mjs --help

Notes

This fixes the cursor offset issue for committed wide characters. The remaining “one syllable delayed” behavior appears to depend on terminal IME preedit/commit
timing: standard TTY input only receives text after the terminal commits it, so the app cannot render preedit text that has not been delivered yet.

Before

After