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/can-decode.md

@@ -0,0 +1,75 @@
+---
+name: can-decode
+description: Check if a video can be decoded by the browser using Mediabunny
+metadata:
+  tags: decode, validation, video, audio, compatibility, browser
+---
+
+# Checking if a video can be decoded
+
+Use Mediabunny to check if a video can be decoded by the browser before attempting to play it.
+
+## The `canDecode()` function
+
+This function can be copy-pasted into any project.
+
+```tsx
+import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
+
+export const canDecode = async (src: string) => {
+  const input = new Input({
+    formats: ALL_FORMATS,
+    source: new UrlSource(src, {
+      getRetryDelay: () => null,
+    }),
+  });
+
+  try {
+    await input.getFormat();
+  } catch {
+    return false;
+  }
+
+  const videoTrack = await input.getPrimaryVideoTrack();
+  if (videoTrack && !(await videoTrack.canDecode())) {
+    return false;
+  }
+
+  const audioTrack = await input.getPrimaryAudioTrack();
+  if (audioTrack && !(await audioTrack.canDecode())) {
+    return false;
+  }
+
+  return true;
+};
+```
+
+## Usage
+
+```tsx
+const src = "https://remotion.media/video.mp4";
+const isDecodable = await canDecode(src);
+
+if (isDecodable) {
+  console.log("Video can be decoded");
+} else {
+  console.log("Video cannot be decoded by this browser");
+}
+```
+
+## Using with Blob
+
+For file uploads or drag-and-drop, use `BlobSource`:
+
+```tsx
+import { Input, ALL_FORMATS, BlobSource } from "mediabunny";
+
+export const canDecodeBlob = async (blob: Blob) => {
+  const input = new Input({
+    formats: ALL_FORMATS,
+    source: new BlobSource(blob),
+  });
+
+  // Same validation logic as above
+};
+```