Electric Fireplace Market Size & Forecasts 2026-2035, By Segments (Application, Distribution Channel, Installation Type, Style, Heating Capacity, Product Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Dimplex, Twin-Star International, Glen Dimplex, Napoleon, Amantii)