Improve visibility of user input in CLI output

[cpu-fan]

Hello!

First of all, thank you for this great tool.

I've noticed that in recent versions, the visual distinction between the assistant's response and the user's input has become less apparent. Currently, the user's message is only prefixed with a small > character.

In long terminal sessions with extensive blocks of text or code, this single character is easily lost, making it difficult to quickly scan the history and find where a specific prompt started.

Suggested Improvement:
It would be very helpful to restore or add more prominent visual highlighting for user inputs. Possible solutions could be:

• Using a different text color for the user prompt.
• Bolding the user's message.
• Adding a background color or a distinct separator line before user input.

This would significantly improve the readability and overall UX of the CLI. What do you think about bringing back more distinct styling for the prompts?