[BUG] VSCode extension: unsent prompt text is lost when switching between chat dialogs

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

This is basically re-requesting https://github.com/anthropics/claude-code/issues/34596 because it is really a nuisance.

When typing a prompt in one chat dialog without sending it, and then switching to another chat dialog, the unsent text in the original dialog is cleared when switching back to it.

What Should Happen?

The unsent draft text is preserved when returning to the dialog.

Error Messages/Logs

Steps to Reproduce

Open a chat dialog in the Claude Code VSCode extension
Start typing a prompt (do not send it)
Switch to a different chat dialog
Switch back to the original dialog

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.179

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_