Global Heating Pad Market Size, Share Demand Report By Product Type (Electric Heating Pads, Microwaveable Heating Pads, Chemical/Single-Use Heat Patches, Hybrid Heat + Electrotherapy Devices), By Application (Musculoskeletal Pain Relief, Menstrual Care & Women’s Health, Sports Recovery & Wellness, Pet & Veterinary Care), By Distribution Channel (Online Retail, Pharmacies & Health Stores, Specialty Medical Equipment Stores, Mass Retail & Department Stores), By Region & Segment Forecasts, 2025–2030