[client] Extract inline Skeleton component out of RafflePage

[Otaiki1]

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.

[Nuel-ship-it]

@Nuel-ship-it has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Nuel-ship-it to this issue.

[drips-wave]

Congratulations, @Nuel-ship-it! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Nuel-ship-it: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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