Replace static animate-pulse with a sweeping gradient shimmer overlay
for a premium loading experience (Spotify/Discord-like).
Skeleton: bg-kodo-steel/50 → bg-muted/50 (design system token), adds
a child div with .skeleton-shimmer class for the gradient sweep.
index.css: add .skeleton-shimmer utility class with linear-gradient
animation (1.8s ease-in-out infinite). Respects prefers-reduced-motion
by disabling animation.
Existing inline skeletons using animate-pulse are unaffected.
Co-authored-by: Cursor <cursoragent@cursor.com>
