Pure liquid glass theme for DeepSeek Harness Web UI

Key features

• SVG Edge Refraction · feDisplacementMap refraction on the input card, send button, message bubbles, view tabs, queue dock, and sidebar buttons.
• Custom Background Blur & Brightness · Control wallpaper blur (bgBlur) and brightness (brightness) independently so the background sits perfectly under the glass.
• Redesigned Model Selector · A full-screen frosted picker with provider-group grid layout and hover highlights — skip the intermediate root pane and jump straight to the model list.
• Dedicated top-level "Liquid Glass" page (settings.section, beside General / Model / Plugins) with two groups: Page Background and Input Card · Frosted Glass.
• Intensity is adjustable from a slider.