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Miguel Ángel
1593055482
## What Enhanced timeline collection to discover GSAP-animated scene elements and persistent overlays through runtime introspection. ## Why The existing timeline collection only captured elements with explicit timing attributes (`data-start`, `data-track-index`) or media elements, missing scene elements that are animated purely through GSAP tweens and persistent overlay elements that should appear for the full composition duration. ## How Added two new discovery mechanisms to `collectRuntimeTimelinePayload`: 1. **GSAP Timeline Introspection**: Walks the master timeline's tweens using `getChildren()` to find animated elements, calculates absolute time ranges by traversing parent timelines, and bubbles child tween ranges up to their nearest scene-level ancestors (direct children of root with IDs). 2. **Persistent Overlay Detection**: Identifies direct children of the root composition that weren't captured by DOM queries or GSAP introspection, treating them as full-duration overlay elements while filtering out non-visual elements (script, style, meta tags) and hidden elements. Both mechanisms respect existing track assignments and create new tracks when needed to avoid conflicts. ## Test plan - [x] Unit tests added/updated - [x] Manual testing performed - [ ] Documentation updated (if applicable) Added comprehensive test coverage for: - GSAP-animated scene element discovery via timeline introspection - Time range bubbling from child elements to scene ancestors - Persistent overlay inclusion as full-duration clips - Proper filtering of non-visual elements (script/style tags)  
