[whitezaddy]

Summary

Closes #857

• Implemented issue Add a trade history CSV export button on the portfolio page #857 by adding an Export CSV button to the trade history tab header on the portfolio page (/profile?tab=trade-history).
• Added ExportTradeHistoryCsvButton component with authenticated access check, loading spinner (Loader2), and accessibility attributes (aria-busy).
• Fetches all trade history records from GET /users/:wallet/trades without pagination limits via cursor-traversal in fetchAllTrades.
• Formats CSV with RFC 4180 escaping, spreadsheet formula injection protection, and exact headers: Date, Key Name, Type, Quantity, Price per Key, Total, Fee.
• Generates file download with filename formatted as trades-[wallet-truncated]-[date].csv via buildTradeHistoryCsvFilename.

Testing

• pnpm lint — passed with 0 errors, 0 warnings
• pnpm build — production TypeScript and Vite bundle build passed
• pnpm test — all 33 related unit and integration tests passed:
  • src/utils/__tests__/tradeExport.utils.test.ts (CSV headers, rows, calculations, escaping, and filename)
  • src/components/common/__tests__/ExportTradeHistoryCsvButton.test.tsx (auth visibility, loading spinner, complete trade fetch, and download trigger)
  • src/pages/__tests__/ProfilePage.integration.test.tsx (tab header button presence and unauthenticated hiding)
  • src/components/common/__tests__/TradeHistoryLedger.test.tsx (pre-existing table tests preserved)

Checklist

• Linked issue or backlog item (Add a trade history CSV export button on the portfolio page #857)
• Scope is limited to the stated change
• Updated docs if behavior or setup changed
• Added screenshots for UI changes when relevant