ui: +300px di altezza di base per finestra desktop e spartito

Finestra desktop 1024x1068 (era 768) e fallback del viewport
spartito a 640dp (era 340).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

desktopApp/src/desktopMain/kotlin/com/notemusicali/Main.kt

@@ -15,7 +15,7 @@ fun main() = application {
     Window(
         onCloseRequest = ::exitApplication,
         title = "InTono",
-        state = rememberWindowState(width = 1024.dp, height = 768.dp),
+        state = rememberWindowState(width = 1024.dp, height = 1068.dp),
     ) {
         NoteMusicaliTheme {
             Surface(