Make the app installable to the iOS home screen and launch standalone
(full-screen, no browser chrome, dark status bar). Add manifest.webmanifest,
square app icons (ten31-app-icon.svg -> 192/512/apple-touch-icon), the
apple-mobile-web-app + manifest <head> tags, viewport-fit=cover, and a
pre-auth /manifest.webmanifest route. No service worker by design.
Keysat