## Implementation Summary ### Changes Made - Created frontend/ directory with Next.js 16.1.0 (App Router, TypeScript, Tailwind CSS) - Configured shadcn/ui component library with new-york style - Set up project structure: src/app/, src/components/, src/lib/, src/types/, src/hooks/ - Configured path aliases (@/* -> ./src/*) - Created home page with shadcn Button component (two variants: default and outline) ### Files Created - frontend/package.json - Project dependencies (React 19, Next.js 16, Tailwind 3) - frontend/tsconfig.json - TypeScript configuration with path aliases - frontend/tailwind.config.ts - Tailwind with shadcn CSS variables - frontend/components.json - shadcn/ui configuration - frontend/src/app/ - Next.js App Router pages and layouts - frontend/src/components/ui/button.tsx - shadcn Button component - frontend/src/lib/utils.ts - cn() utility for class merging ### Verification - npm run dev starts successfully (HTTP 200 on localhost:3000) - npm run build compiles without errors - Home page renders with APC Controller heading and two shadcn Button components - TypeScript type checking passes (tsc --noEmit)