use iOS safe area

This tells the content area to add iOS safe area margin so that there are not UI collisions with the iOS status bar.  See https://learn.microsoft.com/en-us/dotnet/maui/ios/platform-specifics/page-safe-area-layout?view=net-maui-9.0

Author: megahirt

backend/FwLite/FwLiteMaui/MainPage.xaml

@@ -2,6 +2,8 @@
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:local="clr-namespace:FwLiteMaui"
+             xmlns:ios="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;assembly=Microsoft.Maui.Controls"
+             ios:Page.UseSafeArea="True"
              xmlns:shared="clr-namespace:FwLiteShared;assembly=FwLiteShared"
              x:Class="FwLiteMaui.MainPage">
     <BlazorWebView x:Name="blazorWebView" HostPage="wwwroot/index.html">