- ProductDetailView: gallery | info two-column grid on desktop with breadcrumb;
gallery sticky; reviews + similar products full-width below. Mobile stack
unchanged (only lg: utilities + a moved BottomBar, which is position:fixed so
its DOM location doesn't affect mobile)
- BottomBar: static inline buy card on desktop (fixed bottom bar on mobile)
- ProductInfo: larger title + tightened top spacing at lg
- MyLayout: desktop gate now includes /product/*
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
