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/light-leaks.md

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+---
+name: light-leaks
+description: Light leak overlay effects for Remotion using @remotion/light-leaks.
+metadata:
+  tags: light-leaks, overlays, effects, transitions
+---
+
+## Light Leaks
+
+This only works from Remotion 4.0.415 and up. Use `npx remotion versions` to check your Remotion version and `npx remotion upgrade` to upgrade your Remotion version.
+
+`<LightLeak>` from `@remotion/light-leaks` renders a WebGL-based light leak effect. It reveals during the first half of its duration and retracts during the second half.
+
+Typically used inside a `<TransitionSeries.Overlay>` to play over the cut point between two scenes. See the **transitions** rule for `<TransitionSeries>` and overlay usage.
+
+## Prerequisites
+
+```bash
+npx remotion add @remotion/light-leaks
+```
+
+## Basic usage with TransitionSeries
+
+```tsx
+import { TransitionSeries } from "@remotion/transitions";
+import { LightLeak } from "@remotion/light-leaks";
+
+<TransitionSeries>
+  <TransitionSeries.Sequence durationInFrames={60}>
+    <SceneA />
+  </TransitionSeries.Sequence>
+  <TransitionSeries.Overlay durationInFrames={30}>
+    <LightLeak />
+  </TransitionSeries.Overlay>
+  <TransitionSeries.Sequence durationInFrames={60}>
+    <SceneB />
+  </TransitionSeries.Sequence>
+</TransitionSeries>;
+```
+
+## Props
+
+- `durationInFrames?` — defaults to the parent sequence/composition duration. The effect reveals during the first half and retracts during the second half.
+- `seed?` — determines the shape of the light leak pattern. Different seeds produce different patterns. Default: `0`.
+- `hueShift?` — rotates the hue in degrees (`0`–`360`). Default: `0` (yellow-to-orange). `120` = green, `240` = blue.
+
+## Customizing the look
+
+```tsx
+import { LightLeak } from "@remotion/light-leaks";
+
+// Blue-tinted light leak with a different pattern
+<LightLeak seed={5} hueShift={240} />;
+
+// Green-tinted light leak
+<LightLeak seed={2} hueShift={120} />;
+```
+
+## Standalone usage
+
+`<LightLeak>` can also be used outside of `<TransitionSeries>`, for example as a decorative overlay in any composition:
+
+```tsx
+import { AbsoluteFill } from "remotion";
+import { LightLeak } from "@remotion/light-leaks";
+
+const MyComp: React.FC = () => (
+  <AbsoluteFill>
+    <MyContent />
+    <LightLeak durationInFrames={60} seed={3} />
+  </AbsoluteFill>
+);
+```