Interactive UI elements use hardcoded RGB colors instead of terminal theme colors

Description

Claude Code's interactive UI elements (yes/no prompts, selection highlights, theme picker previews) use hardcoded 24-bit RGB color values instead of ANSI color codes. This means they don't adapt to the terminal's configured color palette.

Problem

• Theme picker (/theme) preview colors appear grayed out / muted in terminals like Ghostty
• Interactive elements (prompts, selections) use fixed RGB values that can't be customized via terminal theme settings
• Setting COLORTERM=truecolor does not resolve the issue since the colors are hardcoded in the source, not derived from the terminal's palette

Expected Behavior

Interactive UI elements should use ANSI color codes (or respect the terminal's color palette) so that colors are consistent with the user's terminal theme and can be customized.

Environment

• Terminal: Ghostty (TERM=xterm-ghostty)
• COLORTERM=truecolor is set
• macOS