[S4] Add React error boundaries to pools list and pool detail pages

[Akshola00]

Description

When the API is unavailable, any page that fetches data on mount will throw an unhandled error and show a blank or broken screen. React error boundaries catch these and show a controlled fallback.

Deliverables

• Create nevo_frontend/components/ErrorBoundary.tsx — a class component that catches errors and renders a friendly fallback:
  • Title: "Something went wrong"
  • Message: "We could not load this page. Please try refreshing."
  • A "Refresh" button that calls window.location.reload()
• Wrap app/pools/page.tsx and app/pools/[id]/page.tsx with the boundary
• npm run build passes
• The component accepts an optional fallback prop so callers can override the default UI

Notes

This is a standard React pattern — use a class component with componentDidCatch. No new dependencies needed.

[RemmyAcee]

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

I've reviewed the task and have a clear implementation plan. Looking forward to contributing with a quality PR.

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