Safari 26 on iPhone and iPad brings websites closer to apps with its new Home...

https://mag-wiki.win/index.php/How_Do_You_Keep_a_Web_App_Fast_and_Responsive_on_Mobile_Safari%3F

Safari 26 on iPhone and iPad brings websites closer to apps with its new Home Screen behavior and the 'Open as Web App' feature. When you add a site to your Home Screen, it now launches fullscreen without browser bars—just like a native app