Apply Stave's desktop-first design system when a task changes UI, layout, theme, dialogs, sidebars, empty states, settings, prompt input, or other visual UX in this repo. Use for prompts like "디자인", "UI", "redesign", "polish", "sidebar", "dialog", "settings", or whenever a new interface pattern is introduced. Always use existing shadcn components and the radix-vega preset first — never hand-roll a control that shadcn already provides.