Feature/transaction history infinite scroll

[Agencybuilds]

Closes #260

Description

This PR improves the transaction history loading experience for accounts with a large number of transactions (e.g., thousands of transactions) by implementing cursor-based pagination, lazy loading, and an infinite scroll mechanism.

Key Changes

• Adjusted Batch Size: Reduced the default PAGE_SIZE from 100 to 50 for faster initial loads and more responsive incremental batching.
• Infinite Scroll Sentinel: Added an internal InfiniteScrollSentinel component that utilizes the IntersectionObserver API to detect when the user has scrolled to the bottom of the list.
• Automatic Loading: Replaced manual "Load More" buttons in both the transaction and operations views with the new sentinel component, enabling smooth, automatic background loading as the user scrolls.
• Seamless Integration: The infinite scroll smoothly transitions into the existing VirtualTxList/VirtualOpList rendering components once the list size crosses the 200-item threshold to prevent DOM bloat and UI freezing.
• Network Deduplication: Reused existing deduplication flags (txLoadingRef and opsLoadingRef) alongside txPagingLoading to ensure multiple concurrent network requests aren't triggered by rapid scrolling.

Acceptance Criteria Met

• Transactions load in batches (50 per page initially)
• Infinite scroll implemented for smoother UX
• Pagination cursor properly tracked
• Loading indicators show progress
• Very large histories (>10k txs) don't freeze UI
• Virtual scrolling considered for massive lists
• Network requests debounced to prevent duplicate calls

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