Global Scent Machines Market Size, Share & Demand Report By Product Type (Standalone, HVAC Diffusers, Car Scent Machines, Luxury/Designer Units), By Technology (Cold-Air, Nebulizing, Ultrasonic, Heat-Based), By End-Use Industry (Residential, Hospitality, Retail, Automotive, Healthcare, Corporate Offices, Public Infrastructure), By Distribution Channel (Online, Offline, B2B Direct), By Region & Segment Forecasts, 2025-2030