Feature Request: Add option to collapse/expand queued messages in Copilot Chat

Currently, when there are multiple pending or queued messages in the VS Code Copilot Chat sidebar, they are fully expanded by default. If these messages contain long prompts or extensive code snippets, they occupy a massive amount of vertical space.

This makes it highly inconvenient to manage the queue—specifically when trying to reorder pending messages, as a single large prompt can take up the entire height of the sidebar, forcing the user to do excessive scrolling.

Proposed Solution
Add a collapse/expand toggle (e.g., a small chevron icon or double-click behavior on the message header) for pending/queued messages in the Copilot Chat pane.

Collapsed State: Shows only a single-line preview of the prompt, making it easy to see the entire queue at a glance and drag-and-drop or reorder messages effortlessly.

Expanded State: Shows the full prompt (current behavior).

Additional Context
This would greatly improve the UX of queue management in tight sidebar layouts, especially when drafting or organizing a series of complex, multi-step prompts.