[BUG] VS Code extension (Cursor): AskUserQuestion option previews never render (no preview pane in any layout)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet

(distinct from #29530 — there the dialog fails entirely; here the dialog
works, only the preview pane is missing — and from the TUI truncation
family #38674/#34508, which concern a pane that DOES render)

• [x] This is a single bug report
• [x] I am using the latest version of Claude Code (reproduced on 2.1.195,

2.1.196, and 2.1.197 — latest at time of filing)

What's Wrong?

AskUserQuestion options carrying a preview field never display it in the
VS Code extension (inside Cursor). The dialog renders as a plain single-column
list (question, labels, descriptions); no side-by-side preview layout appears,
and focusing the option with arrow keys shows no pane. Identical on 2.1.195,
2.1.196, and 2.1.197 — not part of the 2.1.196 text regression.

What Should Happen?

Focusing an option with a preview should show the side-by-side layout with
the preview pane (as in the CLI).

Error Messages/Logs

(none)

Steps to Reproduce

1. In the extension, have the model call AskUserQuestion (single-select) whose

first option includes a multi-line preview

1. Focus that option with arrow keys
2. No preview pane appears; the dialog stays a single-column list

Claude Model

Other: claude-fable-5[1m]

Is this a regression?

I don't know (never observed working in the extension)

Last Working Version

n/a

Claude Code Version

VS Code extension 2.1.195–2.1.197

Platform

Anthropic API (Claude Max)

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

Screenshot attached: dialog with a preview-carrying option focused, no pane.