feat(treasury): hookify treasury page with /api/treasury/stats + /api…

[Adeyemi-cmd]

Close #258

PR: Treasury page integration with real backend data

Summary

Replace mock treasury values with live data from backend endpoints.

• Added src/hooks/useTreasury.ts
  • Fetches:
    • GET /api/treasury/stats
    • GET /api/treasury/activity?limit=20
  • Exposes stats, activity, isLoading, isError, refetch
• Updated src/pages/Treasury.tsx
  • Uses useTreasury()
  • Removed hardcoded values (125,400 USDC, 128 scholars, manual activity list)
  • Shows:
    • skeleton loaders while loading
    • error state when fetch fails
    • empty state when activity is []

Why

Current treasury page displays static mock data and does not reflect real on-chain / backend state. This PR makes the dashboard data-driven and aligned with backend contract events.

Testing

1. Start backend + frontend.
2. Load /treasury and verify:
   • stats card values are from API
   • activity feed contains API events
3. Simulate slow API response:
   • skeleton appears
4. Simulate empty activity:
   • empty state card appears
5. Simulate API failure:
   • error box appears

Follow-up

• Add tests for useTreasury hook and Treasury page states.
• Consider Grafana/analytics section to show full historical inflow/outflow charts from API.

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