Safari 26 brings a smoother, app-like experience to many websites on iPhone and...

https://felixssuperperspective.brightsora.com/posts/what-are-the-most-common-limitations-of-web-apps-on-ios-right-now

Safari 26 brings a smoother, app-like experience to many websites on iPhone and iPad. When you add a site to your Home Screen, it can now open without the usual Safari interface, thanks to the new 'Open as Web App' option