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/text-animations.md

@@ -0,0 +1,20 @@
+---
+name: text-animations
+description: Typography and text animation patterns for Remotion.
+metadata:
+  tags: typography, text, typewriter, highlighter ken
+---
+
+## Text animations
+
+Based on `useCurrentFrame()`, reduce the string character by character to create a typewriter effect.
+
+## Typewriter Effect
+
+See [Typewriter](assets/text-animations-typewriter.tsx) for an advanced example with a blinking cursor and a pause after the first sentence.
+
+Always use string slicing for typewriter effects. Never use per-character opacity.
+
+## Word Highlighting
+
+See [Word Highlight](assets/text-animations-word-highlight.tsx) for an example for how a word highlight is animated, like with a highlighter pen.