[client] Extract inline Skeleton component out of RafflePage #767

Summary

RafflePage.tsx defines a local Skeleton component at the top of the file:

const Skeleton = ({ className }: { className?: string }) => (
  <div className={`animate-pulse bg-gray-200 dark:bg-white/5 rounded-2xl ${className}`} />
);

The project already has client/src/components/ui/Skeleton.tsx. Keeping a local copy silently diverges styles.

What to do

1. Verify Skeleton.tsx in components/ui/ accepts a className prop with the same semantics.
2. Replace the inline definition in RafflePage.tsx with an import from components/ui/Skeleton.
3. Check every other page and component for similar inline skeleton definitions and consolidate them.

Acceptance criteria

• No file in client/src/pages/ defines a local Skeleton component.
• The canonical ui/Skeleton is used everywhere.