Trace the theoretical evolution of e-commerce interfaces from desktop-dominated browsing to mobile-first experiences. Discuss the constraints and affordances of mobile devices (screen size, touch interfaces, portability) and how they necessitate different design paradigms compared to desktop. Analyze the concept of 'micro-moments'—intent-rich moments when a user turns to a device to act on a need—and how e-commerce strategies must align with these brief, high-intent interactions.