Improve visual distinction between user messages and Claude responses in CLI output

Summary

Currently, user messages and Claude's responses appear with similar styling in the CLI interface, making it difficult to quickly distinguish between conversation participants.

Proposed Enhancement

Implement distinct visual styling for:

• User messages (e.g., different color, prefix, or indentation)
• Claude responses (current styling or alternative)

Benefits

• Improved readability of conversation history
• Faster visual scanning when reviewing interactions
• Better user experience alignment with other chat interfaces

Examples of Potential Solutions

• Color coding (blue for user, white/default for Claude)
• Prefixes (User: vs Claude:)
• Different indentation levels
• Background highlighting
• Font weight differences

This would make the CLI experience more intuitive and easier to follow during longer conversations.