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/commonMain/kotlin/com/notemusicali/history/PracticeSession.kt

@@ -0,0 +1,35 @@
+package com.notemusicali.history
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class NoteResult(
+    val noteName: String,
+    val midiNumber: Int,
+    val centsDeviation: Float,
+    val reactionTimeMs: Long,
+    val firstAttemptSuccess: Boolean,
+)
+
+@Serializable
+data class PracticeSession(
+    val id: String,
+    val sequenceName: String,
+    val instrumentName: String,
+    val dateMillis: Long,
+    val totalTimeMs: Long,
+    val noteResults: List<NoteResult>,
+    val noteMidiNumbers: List<Int>,
+    val completed: Boolean = true,
+) {
+    val averageCents: Float
+        get() = if (noteResults.isEmpty()) 0f
+        else noteResults.map { kotlin.math.abs(it.centsDeviation) }.average().toFloat()
+
+    val perfectNotes: Int
+        get() = noteResults.count { kotlin.math.abs(it.centsDeviation) <= 10f }
+
+    val firstAttemptRate: Float
+        get() = if (noteResults.isEmpty()) 0f
+        else noteResults.count { it.firstAttemptSuccess }.toFloat() / noteResults.size
+}