Global E-Card Market Size, Share & Demand Report By Card Type (Occasion-Based E-Cards, Non-Occasion E-Cards, Interactive E-Cards, AR-Based E-Cards), By Revenue Model (Free/Ad-Supported, Subscription-Based, Pay-Per-Download, Enterprise Licensing), By Platform (Mobile Applications, Web-Based Platforms, Social Media Integrated Platforms), By End-User (Individual Consumers, Corporate Users, Institutional Users), By Region & Segment Forecasts, 2026–2031