bug(tui): Keyboard shortcuts don't work with Korean IME active

[MinseongS]

Description

Bug Description

Keyboard shortcuts do not work when Korean IME is active. This includes
Ctrl+C (exit), Ctrl+X (leader key), and likely all Ctrl+ combinations.
Must switch to English input method first to use any shortcuts.

I believe this is because the app matches keybindings by character value, so
Ctrl+C registers as Ctrl+ㅊ, Ctrl+X as Ctrl+ㅌ, etc.

Environment: Ubuntu, VSCode integrated terminal

Prior Issues

This has been reported before and similar issues exist for other non-English
IMEs as well:

• bug(tui): Keyboard shortcuts don't work while Korean IME is active on macOS #8652 — Korean IME, closed as "completed" but not actually fixed
• [FEATURE]: Keybinds should work regardless of active input method (non-English IME support) #16252 — Korean IME, open but labeled as feature/discussion
• bug(tui): Keyboard shortcuts don’t work while Zhuyin ((tranditional) IME is active on macOS (Ghostty) #13805 — Zhuyin (Traditional Chinese) IME, same symptoms

PRs #5956 and #6753 attempted fixes using physical keycode (baseCode) but
neither was merged.

Proposed Fix

Use baseCode (physical key position) from the Kitty keyboard protocol instead
of name (character value) for keybind matching. When baseCode is available,
prioritize it — this would fix the issue for Korean IME and likely other
non-Latin input methods as well.

Plugins

None

OpenCode version

v1.3.16

Steps to reproduce

1. Switch to any non-English IME (e.g. Korean, Chinese, Japanese)
2. Open opencode TUI
3. Press Ctrl+C to exit → nothing happens
4. Press Ctrl+X then p (leader key sequence) → nothing happens
5. Switch to English IME
6. Same shortcuts now work

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• bug(tui): Keyboard shortcuts don't work while Korean IME is active on macOS #8652: Korean IME keyboard shortcuts not working (closed as completed but you note it wasn't fixed)
• bug(tui): Keyboard shortcuts don’t work while Zhuyin ((tranditional) IME is active on macOS (Ghostty) #13805: Same symptoms with Zhuyin (Traditional Chinese) IME — open
• [FEATURE]: Keybinds should work regardless of active input method (non-English IME support) #16252: Open feature request specifically requesting IME-agnostic keybind support

For keybind-related issues, please also check our pinned keybinds documentation: #4997