Show a clear waiting-for-input state instead of continuing to animate the spinner

Sometimes the CLI asks me a question but the activity spinner keeps rotating. This makes it look like the agent is still working, when it actually needs my response. It's easy to leave it running and only later realize it was waiting for me.

Suggested behavior

• When the agent is waiting for an answer or approval, freeze or replace the spinner and show Waiting for your input.
• Resume the animation when my response is submitted and processing continues.
• If background agents or commands are still running, show that separately without hiding the fact that my input is needed.

The waiting state should be distinguishable through text or an icon, not just color. This would make it much easier to tell at a glance whether to wait or take action.

首先追踪 CLI 的 spinner 以及问题或批准提示的处理方式。为等待输入添加一个明确区分的文本或图标状态，在收到响应后恢复动画，并让任何后台活动保持单独可见。验证等待状态在不依赖颜色的情况下也清晰明确。