Safari 26 brings a smoother app-like feel to many websites on iPhone and iPad....

https://high-wiki.win/index.php/How_Do_I_Add_a_Website_to_My_iPhone_Home_Screen_the_Right_Way

Safari 26 brings a smoother app-like feel to many websites on iPhone and iPad. When you add a site to your Home Screen, it now opens without the usual browser chrome, making it look and act more like a native app