Add loading and error states to Stats component

[coderabbitai]

Background

The Stats component in web/src/pages/Courts/CourtDetails/Stats/index.tsx currently does not handle loading and error states when fetching data from multiple sources (court details and coin prices).

Proposed Changes

Add loading and error states to improve user experience:

• Display a loading spinner while data is being fetched
• Show an error message if data fetching fails
• Handle both court details and coin prices loading/error states

References

• PR: Release v2-testnet-4.0.5 #1829
• Comment: Release v2-testnet-4.0.5 #1829 (comment)

Additional Context

This improvement will help users understand when data is being loaded or if there are any issues with data fetching.

[jaybuidl]