fix: redundant re-renders in StatsCards (#164)

[laxjovial]

📚 Overview

This PR resolves the issue with redundant re-renders occurring in the StatsCards component, which was identified during a recent performance audit.

🎯 Objectives Completed

• Implemented Fix: Wrapped the StatsCards component in React.memo to prevent unnecessary re-renders when the parent component updates, preserving application performance.
• Added Unit Tests: Introduced a comprehensive unit testing suite for StatsCards (StatsCards.test.tsx) to ensure core functionality, conditional rendering, and integration with the useTrust hook operate correctly.
• Verified with Protocol Invariants: Ensured that the implementation matches platform expectations with zero regressions across the broader component ecosystem.

🧩 Technical Scope

• Modified src/components/features/StatsCards.tsx
• Created src/components/features/__tests__/StatsCards.test.tsx

✅ Acceptance Criteria

• Implementation is functional and prevents redundant re-renders.
• All newly added tests passed successfully.
• No UI or functionality regressions introduced.

🔗 References

Closes #164
Internal Ref #FE-164