DeepSeek Harness Plugin: dsh-terminal-font

The `dsh-terminal-font` plugin is designed to resolve the issue of Nerd Font icons appearing as blank squares in the DeepSeek Harness (DSH) sidebar terminal. Users can specify a Private Use Area–supporting font (such as Cascadia Code Mono) through the settings interface or use a recommended list of fonts already installed on the system to render Powerline icons correctly. The plugin supports font size adjustment, live preview, and local persistent storage. It can be installed via the settings interface, command line, or local source code, but note that it depends on DSH internal implementation details and requires the font files to be preinstalled.