Add skeleton loading states to the investor dashboard

[king-aj-the-first]

Background: The investor dashboard loads position data asynchronously but shows a blank screen while fetching. Skeleton screens improve perceived performance.

What "done" looks like:

• app/dashboard/investor/ renders skeleton variants of StatCard, PortfolioDonut, and the positions table while data loads
• Skeletons match the dimensions of the real content to prevent layout shift
• Use existing skeleton.tsx primitives

Key files: app/dashboard/investor/, components/ui/skeleton.tsx, components/dashboard/PortfolioDonut.tsx

Constraints:

• Skeletons must be screen-reader friendly (use aria-busy on containers)
• Loading state must time out after 30s and show an error state

PR must include: Skeleton wiring + aria attributes + Storybook story for loading state.

[originaldefiboy]

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

Hey maintainer i am familiar with this task kindly assign issue to me.
Thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @originaldefiboy to this issue.

[drips-wave]

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

🧑‍💻 @originaldefiboy: 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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[drips-wave]

This issue has been removed from the Stellar Wave Program by the repository maintainers.

@originaldefiboy, you have been unassigned from this issue. If you have any questions, please reach out to the repo maintainers.