OpenCut engine update — animation utilities, background effects, beat sync

[federicodeponte]

Hey @nossa-y — wanted to share what we just shipped in OpenCut 🎬

We ported a bunch of visual/motion primitives from our launch video work (Rocketlist, Floom, HyperNiche) back into the engine so every future video gets them for free.

New stuff:

• animations.ts — particle system, wave motion, breathing effects, stagger, typewriter, animated counters, easing helpers, spring presets, Ken Burns presets
• BackgroundEffects.tsx — generative SVG backgrounds (orbs, particles, grid, waves, dots, vignette)
• TypingText.tsx — reusable typing animation with cursor
• CrossfadeScene.tsx — reusable crossfade wrapper with asymmetric cubic easing
• MusicSync.ts — beat-sync utilities for locking transitions to musical tempo

Integration:

• TimelineSegment now has backgroundEffect?: BackgroundEffectConfig
• All exported from src/engine/index.ts

Check it out at https://github.com/floomhq/opencut/tree/main/src/engine

cc @federicodeponte