[FEATURE] Visually distinguish user prompts in conversation history

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When scrolling through a long conversation, it's difficult to quickly spot one's own messages among the assistant's responses.

A similar issue was opened but closed last month (already ?!?)
https://github.com/anthropics/claude-code/issues/51942

Proposed Solution

It would be helpful if user prompts were displayed with a visual distinction (e.g. different background, separator line, bold prefix, or color) to make navigation easier.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_