fixing multi-OS builds

Author: leogdion

Sources/RadiantKit/ViewExtensions/SingleWindowView.swift

@@ -62,6 +62,7 @@
   }
 
   #if os(macOS) || os(iOS) || os(visionOS)
+
     extension WindowGroup {
       /// Initializes a new instance of the `WindowGroup` with a single window
       /// view.
@@ -76,5 +77,17 @@
         }
       }
     }
-  #endif
+#else
+extension WindowGroup {
+  /// Initializes a new instance of the `WindowGroup` with a single window
+  /// view.
+  /// - Parameter _: The type of the `SingleWindowView`.
+  @MainActor
+  public init(singleOf _: Content.Type) where Content : SingleWindowView {
+    self.init {
+      Content()
+    }
+  }
+}
+#endif
 #endif

Sources/RadiantProgress/ProgressOperationProperties.swift

@@ -27,7 +27,7 @@
 //  OTHER DEALINGS IN THE SOFTWARE.
 //
 
-#if canImport(Observation) && (os(macOS) || os(iOS))
+#if canImport(Observation)
 
   public import Foundation