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>

video/.agents/skills/remotion-best-practices/rules/measuring-dom-nodes.md

@@ -0,0 +1,34 @@
+---
+name: measuring-dom-nodes
+description: Measuring DOM element dimensions in Remotion
+metadata:
+  tags: measure, layout, dimensions, getBoundingClientRect, scale
+---
+
+# Measuring DOM nodes in Remotion
+
+Remotion applies a `scale()` transform to the video container, which affects values from `getBoundingClientRect()`. Use `useCurrentScale()` to get correct measurements.
+
+## Measuring element dimensions
+
+```tsx
+import { useCurrentScale } from "remotion";
+import { useRef, useEffect, useState } from "react";
+
+export const MyComponent = () => {
+  const ref = useRef<HTMLDivElement>(null);
+  const scale = useCurrentScale();
+  const [dimensions, setDimensions] = useState({ width: 0, height: 0 });
+
+  useEffect(() => {
+    if (!ref.current) return;
+    const rect = ref.current.getBoundingClientRect();
+    setDimensions({
+      width: rect.width / scale,
+      height: rect.height / scale,
+    });
+  }, [scale]);
+
+  return <div ref={ref}>Content to measure</div>;
+};
+```