Kids Smartwatch Market Size & Forecasts 2026-2035, By Segments (Type, Compatibility, Water Level Resistance, Consumer Group, Distribution Channel, Shape, Battery Life, Price, Screen size, Connectivity, Watchband Material), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Apple, Xiaomi, Huawei, Fitbit, Samsung)