Build native UI shell foundation

desktopApp/src/main/kotlin/com/vnidrop/app/main.kt

@@ -3,11 +3,21 @@ package com.vnidrop.app
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
 
-fun main() = application {
-	Window(
-		onCloseRequest = ::exitApplication,
-		title = "vnidrop",
-	) {
-		App()
+fun main() {
+	configureMacOsNativeAppearance()
+	application {
+		Window(
+			onCloseRequest = ::exitApplication,
+			title = "vnidrop",
+		) {
+			App()
+		}
 	}
 }
+
+private fun configureMacOsNativeAppearance() {
+	if (!System.getProperty("os.name").startsWith("Mac", ignoreCase = true)) return
+	// AWT reads this before creating the first native window. Runtime theme
+	// changes are handled in the JVM platform appearance hook.
+	System.setProperty("apple.awt.application.appearance", "system")
+}