VS Code extension: session rename not reflected in past conversations dropdown

Description

When renaming a session via /rename in the CLI, the new name is not picked up by the VS Code extension's "past conversations" dropdown. The dropdown continues to show the old/default session name.

Steps to reproduce

1. Start a Claude Code session in the terminal CLI
2. Run /rename my-session-name
3. Open the Claude Code VS Code extension (tested in Cursor, a VS Code fork)
4. Open the "past conversations" dropdown
5. The session still appears with its old/default name, not the renamed one

Expected behavior

The past conversations dropdown should reflect the renamed session name.

Environment

• Claude Code CLI (terminal session)
• Claude Code VS Code extension running in Cursor
• macOS