Feature request: Allow renaming Claude Code tab title in VS Code

Feature Request

Description:
Allow users to customize/rename the Claude Code tab title in the VS Code extension.

Use case:
When working with multiple Claude Code tabs open simultaneously, all tabs display the same title "Claude Code", making it difficult to distinguish which tab is handling which task (e.g., "Auth refactor", "UI fix", "Data pipeline").

Current behavior:

• The tab title is always "Claude Code" and cannot be changed
• Right-clicking the tab does not show a "Rename" option (unlike terminal tabs)
• Conversation history supports renaming, but the tab title itself does not reflect it

Proposed solution:

• Add a "Rename Tab" option in the tab's right-click context menu, or
• Reflect the conversation history name in the tab title, or
• Add a command palette option (e.g., "Claude Code: Rename Tab")

This would greatly improve the multi-tab workflow experience.