Add visual distinction for user messages to improve scrollback navigation

Problem

In long conversations, it's hard to visually locate your own messages when scrolling up. User input and Claude's responses blend together, making it difficult to find specific points in the conversation.

Suggestion

Add a visual signal to user-typed messages — for example:

• A colored left gutter/border on user message lines
• Different text emphasis (bold, dim background, or color)
• A visible prompt marker that stands out

This would make it easy to scan through a long session and quickly find where you asked something.

Context

This is purely a readability/UX improvement. The current rendering treats user and assistant messages similarly enough that scanning is slow. Even a subtle left-border color or a distinct prompt glyph would help significantly.

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