Initial commit: InTono — app KMP per l'apprendimento musicale

App Kotlin Multiplatform (Android/iOS/Desktop) con Compose Multiplatform:
controllo intonazione (YIN), pratica guidata, metronomo, ear training,
sfide, scansione spartiti via AI, spartiti bundled e pentagramma con
glifi tipografici, travature, battute e spaziatura proporzionale.

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

shared/src/desktopMain/kotlin/com/notemusicali/scan/PlatformImage.desktop.kt

@@ -0,0 +1,26 @@
+package com.notemusicali.scan
+
+import java.awt.image.BufferedImage
+import java.io.ByteArrayOutputStream
+import javax.imageio.ImageIO
+
+actual typealias PlatformImage = BufferedImage
+
+actual fun PlatformImage.toBase64Jpeg(maxDim: Int, quality: Int): String {
+    val scaled = if (width > maxDim || height > maxDim) {
+        val scale = maxDim.toDouble() / maxOf(width, height)
+        val newW = (width * scale).toInt()
+        val newH = (height * scale).toInt()
+        val img = BufferedImage(newW, newH, BufferedImage.TYPE_INT_RGB)
+        val g = img.createGraphics()
+        g.drawImage(this, 0, 0, newW, newH, null)
+        g.dispose()
+        img
+    } else {
+        this
+    }
+
+    val stream = ByteArrayOutputStream()
+    ImageIO.write(scaled, "JPEG", stream)
+    return java.util.Base64.getEncoder().encodeToString(stream.toByteArray())
+}