Agents: Too easy to archive a session by mistake

- Copilot Chat Extension Version:
- VS Code Version: 1.131.0
- OS Version: Darwin arm64 25.6.0
- Feature (e.g. agent/edit/ask mode): Agent
- Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet):
- Logs:

Steps to Reproduce:

1. Have multiple sessions active in the agent view
2. Go to click to authorise a cange

As the lines are close can can be impacted by other sessions changing their state, it is very easy to miss the action and mistakenly archive a session you want as there is no confirmation for the action. If this happens you then need to know what might have been there to try and find and restore.