Apply this skill when building, reviewing, or refactoring any UI in a React + TypeScript + Tailwind + shadcn/ui application. Triggers on requests like "add a form", "build a modal", "create a dropdown", "make this accessible", "add a table", "build a navigation", or any time you are creating interactive components. Use proactively — every component must be accessible by default. EU accessibility law (EAA) mandates compliance since June 2025.