dsh-text-appearance: DeepSeek Harness Text Appearance Plugin

`dsh-text-appearance` is an open-source plugin for DeepSeek Harness, designed to replace the basic built-in text appearance settings with finer-grained style control. It allows users to separately adjust the **font, color, and font size** of thinking content and body text in settings. Color adjustment uses HSL sliders, supporting font sizes of 12–28px. Configurations persist after installation. It supports both browser and desktop environments, is implemented via CSS overrides, and has no official dependencies.