fix: warnings

Author: triniwiz

template/framework/__PROJECT_NAME__/Program.cs

@@ -4,6 +4,12 @@
 using Microsoft.UI.Xaml;
 using WinRT;
 
+// Windows-only WinUI desktop app. The custom entry point (DISABLE_XAML_GENERATED_MAIN)
+// has no platform attribute, so CA1416 treats every Windows API call site as "reachable
+// on all platforms." Declaring the assembly's supported platform once tells the analyzer
+// the whole assembly only runs on Windows >= 17763, silencing those false positives.
+[assembly: System.Runtime.Versioning.SupportedOSPlatform("windows10.0.17763.0")]
+
 namespace __PROJECT_NAME__
 {
     public static class Program