User input in CLI should have a more distinct, *full-width* background color for better visual separation

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

Working in a Claude Code terminal, i have to scroll up|down to go to a response's start. Having my questions|prompts in a full-width highlighted stripe, would help a lot.

Proposed Solution

I think the easiest way would be to change the existing user's prompt highlighting from light gray, covering just what the user wrote to a, say, very light blue highlight, covering the entire width of the terminal.
Better yet, since the terminal may already have a non-black background, the highlight color could be configurable.

Alternative Solutions

Since the terminal itself (I've used Konsole and Terminator) cannot distinguish user's prompts from Claude's, there doesn't seem to be any workaround - the solution can come from Claude's part.

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_