VS Code extension: conversation lost when dragging tab to another window

Description

When using the Claude Code VS Code extension, dragging the Claude Code chat tab to a separate VS Code window causes the entire conversation to disappear. The chat history is lost and cannot be recovered.

Steps to Reproduce

1. Open Claude Code in VS Code (chat panel)
2. Have an active conversation with history
3. Drag the Claude Code tab to a separate VS Code window (or detach it into a new window)
4. Conversation disappears entirely

Expected Behavior

The conversation should persist when the tab is moved to another window, similar to how other VS Code panels/tabs retain their state when dragged between windows.

Workaround

Use VS Code's built-in "Split Right" (right-click tab → Split Right) instead of dragging to a new window.

Environment

• macOS (Darwin 25.0.0)
• Claude Code VS Code extension