feat: add transaction history

[henrypeters]

Changes:

• analyticsService.ts — calculates earnings, win rate, avg stake; filters by time period (7d/30d/all), token, and status; CSV export
• useAnalytics.ts — hook wrapping useMatches with 5-minute client-side cache
• EarningsChart / WinRateTrend — recharts area/line chart components
• AnalyticsDashboard — main component with stat cards, time period selector, token/status filters, match history table, and CSV export button
• App.tsx — dashboard rendered when wallet is connected
• Unit tests for all analytics calculations; component tests for the dashboard

Security: all data is filtered server-side by the connected wallet's public key — no cross-user data exposure.

closes #741

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