dsh-client-ui-solarized-grid: A Solarized Color Scheme and Graph Paper Background Theme Plugin

`dsh-client-ui-solarized-grid` is a theme plugin designed for the DeepSeek Harness desktop/web client, aimed at improving visual comfort during extended use. It introduces the Solarized color scheme and a graph paper background, supports light/dark mode switching, and redesigns the chat bubble styles. The plugin remaps 201 tokens and specifically optimizes text readability in dark mode. Installation is zero-dependency and copy-based, supporting one-click install and uninstall.