KEEP IT AT 60 FPS.

Do a motion performance pass on this codebase.

Find and fix: animations on width, height, top, left, margin or padding (rewrite as transform), large or animated blur values, continuously running animations that are off-screen (pause with IntersectionObserver), scroll or pointer handlers that read layout every event (batch inside requestAnimationFrame and cache rects), will-change left on permanently, and simultaneous mounting of many heavy previews (lazy-mount on intersection).

Report each issue found, the file, and the fix applied. Target 60fps on a mid-range laptop with the page scrolled at full speed.

---
Tool: Lovable. Apply the changes directly to the existing codebase, reuse the current design tokens and component structure, and do not introduce new dependencies.