Next.js 16 with App Router and React 19, locale-prefixed routing ([locale]/), island architecture (WasmIsland for engine, RefinedIsland for data layer), Suspense boundaries with PageLoader fallbacks, partial pre-rendering (PPR) with cache components, parallel routes (@breadcrumb, @modal), grouped routes with (directory) syntax, React Compiler (babel-plugin-react-compiler), Turbopack filesystem cache, Panda CSS with Park UI (Ark UI-based), Intlayer for i18n (en + de), 50+ routes across 7 major sections (home, account, analytics, dev, plan, rotations, simulate).
Next steps