Safari 26 on iPhone and iPad makes many websites feel just 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 just like apps by improving how they behave when saved to your Home Screen. When you add a site, it can now open as a standalone web app without the usual browser bars or tabs getting in the way