VS Code panel goes blank when dragged out to separate window

Summary

When dragging the Claude Code panel out of the VS Code sidebar to pop it out as its own floating window, the panel goes completely blank. The active session is lost (no proper cleanup/context clear occurs).

Steps to reproduce

1. Have an active Claude Code conversation in the VS Code panel
2. Drag the panel tab from its current location to a blank space to pop it out as a separate window
3. Panel goes blank — session is lost

Expected behavior

The panel should continue rendering the active session in the new window, or at minimum gracefully handle the detach (preserve session state so it can be resumed).

Actual behavior

• Panel goes completely blank
• Active session is killed without cleanup
• Session transcript in .claude/projects/ shows no proper termination

Environment

• VS Code: 1.109.5 (arm64)
• Claude Code extension: 2.1.52
• macOS: 15.7.3 (Sequoia)
• Hardware: MacBook Pro, Apple M2 Max, 96 GB RAM

Notes

This is reproducible. The standard VS Code panel pop-out behavior (drag to separate window) works for other panels — this appears specific to the Claude Code webview.