Safari 26 on iPhone and iPad makes many websites feel more like apps by...

https://bizzmarkblog.com/why-does-my-ipad-web-app-feel-different-from-the-same-site-in-safari-tabs/

Safari 26 on iPhone and iPad makes many websites feel more like apps by improving Home Screen behavior and introducing 'Open as Web App.' When you add a site to your Home Screen, it now launches without the usual browser bars and controls