dsh-theme-eye-care: Eye-Care Color Scheme for DeepSeek Harness

The DSH Harness (DSH) plugin `xiaotuchu/dsh-theme-eye-care` provides low-irritation color schemes to reduce visual fatigue. It includes three built-in themes—Warm Paper, Bean Green, and Warm Gray—and dark mode automatically applies matching night-mode schemes in the same color family. It supports immediate application, automatic saving, and synchronization across multiple windows. Installation requires running the specified command and restarting DSH. Users can switch themes in Settings, with preferences stored by domain. Note that colors in some third-party components may not be override-able, and the plugin is only compatible with DSH >= 0.2.0-rc.2.