What problem does it solve? Building modern web UIs requires keeping up with rapidly evolving frameworks like React 19, Next.js 16, and Vue 3.5, plus consistent decisions on state management, accessibility, and performance. This Skill provides structured patterns, implementation quickstarts, and verification checklists so frontend work follows current best practices instead of ad-hoc guesses. ## Core Features & Use Cases - Framework Patterns: Covers React 19 Server Components and cache(), Next.js 16 App Router and Server Actions, and Vue 3.5 Composition API with Pinia. - Architecture & Performance Guidance: Includes component architecture with CVA variants, state management with Zustand/Redux Toolkit/Pinia, code splitting, memoization, and Vercel's 45 React best-practice rules. - Quality Gates: Ships red-flag lists, common rationalization counters, and verification checklists covering accessibility, TypeScript strictness, and bundle size. - Use Case: When asked to build a new dashboard page, the Skill guides creation of a Next.js Server Component with Suspense loading states, a validated Server Action using zod, and accessible interactive elements. ## Quick Start Ask the agent to build a React 19 server component page with a Suspense loading state and a validated Next.js server action for form submission.