The frontend counterpart to `pr-impact-scan`. Before you PR a change to a React / Next.js / SPA codebase, enumerate the concrete performance regressions the diff introduces. New heavy imports, client-bundle bloat from server-to-client migration, list rendering without virtualization or keys, images
The frontend counterpart to `pr-impact-scan`. Before you PR a change to a React / Next.js / SPA codebase, enumerate the concrete performance regressions the diff introduces. New heavy imports, client-bundle bloat from server-to-client migration, list rendering without virtualization or keys, images without dimensions (CLS), fonts without preload (LCP), RSC network waterfalls, and hydration-mismatc