Show current command above input box for demo audience

Describe the feature or problem you'd like to solve

In demos, when watching user using GHCP CLI, when they submit a command it is nonlonger visible so it is hard for the audience to follow, especially for those that use subtitles and are reading while the command is typedand

Proposed solution

UX Improvement Request — Copilot CLI Command Visibility

Summary
The Copilot CLI UI clears the command input after execution, which makes it difficult for observers during demos to see what command was just run. This reduces clarity when presenting workflows or teaching the tool.

Problem
When a command is executed, the UI refreshes and the previous command disappears from view. In demo or training scenarios, the audience cannot see the command that triggered the current output, which causes confusion and interrupts the flow of explanation.

Expected Behavior
The UI should retain a small, unobtrusive line showing the previously executed command directly above the current input prompt. This would allow viewers to understand what is being demonstrated without relying on verbal repetition.

Why This Matters

• The command can be typed too fast to comprehend
• Improves demo clarity
• Helps audiences follow along
• Makes the CLI more intuitive during presentations
• Reduces friction for trainers and advocates
• Accommodates those using subtitles.

Proposed Enhancement
Add a “last command” line above the input prompt that persists until the next command is run. This mirrors common UX patterns in interactive CLI tools and significantly improves usability in live demos.

If you want, I can also generate a shorter version or a more formal version.

Example prompts or workflows

No response

Additional context

No response

未指定文件或测试。首先定位 CLI 输入和命令执行的入口点，然后跟踪输入被清除以及输出视图被刷新的位置。完成的标准是：最近执行的命令会一直显示在当前输入上方的一小行中，直到再次运行其他命令，并且不影响正常交互。