Feature Request: Add "Rename Session" command to VS Code extension

Summary

Add a VS Code command palette command (e.g. Claude: Rename Session) to rename the current conversation session, similar to the /rename command available in the terminal CLI.

Problem

In the VS Code extension, the only way to rename a session is through the Past Conversations dropdown → hover over session → click pencil icon. There is no command palette command or keyboard shortcut to quickly rename the current active session.

The terminal CLI version has /rename [name] which works great, but this isn't available in the extension.

Proposed Solution

• Add a Claude: Rename Session command to the VS Code command palette
• Optionally support an inline /rename command in the extension chat input
• When triggered, show an input box pre-filled with the current session name

Use Cases

• Quickly naming a session while working without leaving the chat flow
• Power users who prefer keyboard-driven workflows over mouse interactions