Follow up to https://github.com/zed-industries/zed/pull/46797

When you send a message, as per the PR linked above, Zed will now queue
it by default. But if you want to fast-track it/interrupt the agent
immediately, effectively sending the first message in the queue, you can
just hit enter again and it will get sent right away.


https://github.com/user-attachments/assets/5e6230f6-c56e-4496-9bcb-8d6ffb9e19cb

Release Notes:

- Agent: Made it easier to interrupt the agent while having messages in
the queue.