feat(dashboard): refactor transaction history with virtualization and server pagination

[lemarjohnny781]

Summary

This PR refactors the transaction history dashboard to improve performance, maintainability, and support real backend data. It separates business logic from presentation, adds virtualization for mobile transaction cards, and introduces server-side pagination support for larger datasets.

Changes

• Extracted inline mock transactions and quick filters into lib/fixtures/transactions.ts
• Moved transaction filtering, sorting, and pagination logic into hooks/use-transaction-history.ts
• Updated components/dashboard/transaction-history.tsx to consume the hook and render a virtualized mobile transaction list using @tanstack/react-virtual
• Added server-side pagination support via isServerPaginated, totalCount, and onPageChange props
• Added regression coverage in hooks/__tests__/use-transaction-history.test.ts
• Updated package.json / package-lock.json to include @tanstack/react-virtual

Testing

• npm test -- --runInBand hooks/__tests__/use-transaction-history.test.ts
• npx tsc --noEmit --pretty false

Notes

This work prepares the dashboard for real transaction volumes by reducing render cost on mobile and enabling backend-driven pagination with consistent UI behavior.

closes #320

[vercel]

@Olisachukwuma1 is attempting to deploy a commit to the kelly musk's projects Team on Vercel.

A member of the Team first needs to authorize it.

[kelly-musk]

Closing without merging: main already implements this PR's goal (transaction history virtualization + server-side pagination) independently — see components/dashboard/transaction-history.tsx (custom useVirtualList + VIRTUAL_THRESHOLD) and hooks/use-swr-infinite pagination against /api/dashboard/transactions. This PR's branch predates that work and merging it would regress the existing implementation rather than improve it.