//! Centralized design system for VT Code.
//!
//! This crate provides a single source of truth for all design system concerns:
//! - **Color conversion**: Unified `anstyle` to `ratatui` color mapping
//! - **Style bridging**: Conversion between styling frameworks
//! - **Design constants**: Shared UI constants (ellipses, spacing, breakpoints)
//! - **Layout**: Responsive layout mode logic
//! - **Panel**: Base panel widget primitive
//! - **Diff formatting**: Unified diff rendering with ANSI colors