🔍 Add transaction search and filtering

[jobbykings]

Summary

Users with many transactions need to search and filter by type, asset, date range, and amount.

Tasks

• Add search bar to transaction history
• Add filter panel: type (send/receive/swap), asset, date range, amount range
• Implement client-side filtering for small datasets
• Server-side filtering for large datasets

Acceptance Criteria

• Filters work correctly for all filter types
• Search matches tx hash, asset name, and address