Polish native shell navigation

shared/src/jvmMain/kotlin/com/vnidrop/app/platform/PlatformSystemAppearance.jvm.kt

@@ -22,6 +22,7 @@ internal object DesktopSystemAppearance {
 		if (!isMacOs()) return
 		System.setProperty(MAC_APPEARANCE_PROPERTY, macOsAppearanceName(isDarkTheme))
 		EventQueue.invokeLater {
+			DesktopAppearanceBridge.applyNativeAppearance?.invoke(isDarkTheme)
 			Window.getWindows().forEach { window ->
 				applyWindowChrome(window, isDarkTheme)
 			}
@@ -31,6 +32,8 @@ internal object DesktopSystemAppearance {
 	internal fun macOsAppearanceName(isDarkTheme: Boolean): String =
 		if (isDarkTheme) "NSAppearanceNameDarkAqua" else "NSAppearanceNameAqua"
 
+	internal fun usesTransparentTitlebar(): Boolean = true
+
 	internal fun titlebarBackground(isDarkTheme: Boolean): Color =
 		if (isDarkTheme) Color(0x12, 0x12, 0x12) else Color(0xF8, 0xF8, 0xF8)
 
@@ -38,9 +41,9 @@ internal object DesktopSystemAppearance {
 		val background = titlebarBackground(isDarkTheme)
 		window.background = background
 		(window as? JFrame)?.rootPane?.let { rootPane ->
-			// Keep the native macOS controls and drag behavior, but let the
-			// decorated titlebar blend with the app's resolved light/dark surface.
-			rootPane.putClientProperty(TRANSPARENT_TITLE_BAR_PROPERTY, true)
+			// The titlebar stays native, but AppKit receives the resolved app
+			// appearance so title text and controls switch contrast at runtime.
+			rootPane.putClientProperty(TRANSPARENT_TITLE_BAR_PROPERTY, usesTransparentTitlebar())
 			rootPane.background = background
 			rootPane.contentPane.background = background
 		}
@@ -49,3 +52,8 @@ internal object DesktopSystemAppearance {
 	private fun isMacOs(): Boolean =
 		System.getProperty("os.name").startsWith("Mac", ignoreCase = true)
 }
+
+object DesktopAppearanceBridge {
+	@Volatile
+	var applyNativeAppearance: ((Boolean) -> Unit)? = null
+}