[BUG] Question dock custom answer textarea submits on IME composition Enter #20850

Description

In the web version, the "Type your own answer" textarea in the question dock (SessionQuestionDock) submits the custom answer when pressing Enter to confirm an IME composition (e.g. Japanese, Chinese, Korean).

The onKeyDown handler on the textarea does not check event.isComposing or event.keyCode === 229, so Enter during IME composition triggers commitCustom() instead of just committing the composed character.

This is the same class of bug as #16360 (LineCommentEditor), which was fixed in #16361. The question dock textarea was not covered by that fix.

Plugins

No response

OpenCode version

No response

Steps to reproduce

1. Open OpenCode in a browser (web or desktop)
2. Trigger a question with a custom answer option (e.g. a tool that uses AskYourQuestion with custom: true)
3. Click "Type your own answer" to open the custom input textarea
4. Enable a CJK input method (e.g. Japanese IME)
5. Type characters — IME composition begins (underline appears)
6. Press Enter to confirm the IME candidate

Expected: The composed character is committed to the textarea; composition ends.
Actual: The custom answer is submitted immediately with incomplete text.

Screenshot and/or share link

same visual behavior as #16360

Operating System

macOS

Terminal

No response