URLs displayed for manual authentication are unusable due to decorative formatting

Description

When Claude Code displays URLs that require manual copy-paste (e.g., OAuth authentication flows), they are surrounded by decorative boxes or markdown formatting that makes them difficult or impossible to select and copy in the terminal.

Steps to Reproduce

1. Trigger a flow that requires manual authentication (e.g., OAuth)
2. Claude Code displays the authentication URL wrapped in a decorative box
3. Attempt to select and copy the URL

Expected Behavior

Authentication URLs should be displayed as plain text without decorations so users can easily copy them.

Actual Behavior

URLs are wrapped in decorative formatting/boxes that interfere with text selection and copy-paste functionality in terminals.

Environment

• Platform: Windows 10
• Shell: bash