Feature Request: Customizable Terminal Color Theme / UI Styling Support

Problem / Motivation

Currently, Kimi Code CLI only supports a binary theme = "dark" | "light" option. While functional, this is quite limiting for users who:

• Use terminal emulators with custom color palettes (e.g., Catppuccin, Gruvbox, Nord, Dracula, Tokyo Night)
• Have accessibility needs requiring high-contrast or specific color combinations
• Want the CLI interface to blend seamlessly with their overall development environment aesthetic
• Are used to modern CLI tools (like bat, eza, btm, lazygit) that offer rich theming support

Proposed Solution

Introduce a more flexible theming system for Kimi Code CLI. Possible approaches:

1. Built-in Preset Themes

   • Provide a set of popular built-in themes: catppuccin, gruvbox, nord, dracula, tokyo-night, solarized, monokai, etc.
   • Usage: theme = "catppuccin-mocha" in ~/.kimi/config.toml

2. Custom Theme Configuration

   • Allow users to define custom color mappings in the config file:

   [theme.custom]
   background = "#1e1e2e"
   foreground = "#cdd6f4"
   accent = "#89b4fa"
   success = "#a6e3a1"
   error = "#f38ba8"
   warning = "#f9e2af"
   info = "#89dceb"
   border = "#45475a"
   selection = "#313244"
   

3. Environment Variable / XDG Integration

   • Respect $LS_COLORS, terminal background detection, or integrate with common theme environment variables

4. Theme Marketplace / Community Themes

   • Allow loading themes from ~/.kimi/themes/ directory
   • Community can share themes via GitHub repo or simple file sharing

Benefits

• Improved accessibility for users with visual impairments
• Better integration with modern developer workflows
• Reduced eye strain with cohesive terminal aesthetics
• Community engagement through shared custom themes

Prior Art / Inspiration

• bat — custom theme support via --theme
• eza — color scheme customization
• lazygit — extensive theme configuration
• btm — built-in color themes

Additional Context

Currently the only theming knob is:

theme = "dark"  # or "light"

Would love to see Kimi Code CLI become more visually flexible!

Start by reviewing the existing theme = "dark" | "light" configuration described in the issue and identify how the CLI currently applies it. Before implementation, narrow the proposal to one approach, such as presets or custom mappings, and define the supported configuration and completion criteria. No source file or test is named, so locating the theme handling and relevant tests is part of the initial research.