iOS PWA and IT Job Checklist for IT Staff view

lib/widgets/ios_install_prompt_web.dart

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+import 'dart:js_interop';
+
+@JS('navigator.userAgent')
+external String get _navigatorUserAgent;
+
+@JS('window.matchMedia')
+external _MediaQueryList _matchMedia(String query);
+
+extension type _MediaQueryList._(JSObject _) implements JSObject {
+  external bool get matches;
+}
+
+/// Returns true when the user is on iOS Safari and the app has NOT been added
+/// to the Home Screen (i.e., not running in standalone mode).
+///
+/// When this returns true, we show the "Add to Home Screen" install banner so
+/// that users can unlock iOS 16.4+ web push notifications.
+bool detectIosSafariNotInstalled() {
+  final ua = _navigatorUserAgent.toLowerCase();
+  final isIos =
+      ua.contains('iphone') || ua.contains('ipad') || ua.contains('ipod');
+  if (!isIos) return false;
+
+  // The PWA is "installed" if the display-mode: standalone media query matches.
+  final isStandalone = _matchMedia('(display-mode: standalone)').matches;
+  return !isStandalone;
+}