Convertible Roof System Market Size & Forecasts 2026-2035, By Segments (Roof Type, Actuation Mechanism, Material, End-Use Application, Vehicle Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Webasto, Inalfa Roof Systems, Magna International, Inteva Products, Aisin Seiki)