feat: implement wave issues 229, 238, 189, 115

[dimka90]

Summary

Implements all 4 assigned issues from the Drips Wave:

• soroban-client: Build browser wallet adapter abstraction #229: Build browser wallet adapter abstraction - Created reusable wallet adapter interfaces in lib/wallet/adapter.ts
• soroban-client: Create pagination utilities for large contract state reads #238: Create pagination utilities - Added cursor and page-size utilities in lib/pagination.ts for scalable state retrieval
• Develop WebSocket integration for real-time contract event monitoring with soroban-client #189: Develop WebSocket integration - Implemented real-time event monitoring in lib/events/websocket.ts
• Add event check-in system with on-chain verification #115: Add event check-in system - Added on-chain check-in with smart contract integration

Changes

Frontend (soroban-client)

• lib/wallet/adapter.ts - Wallet adapter interfaces and types
• lib/pagination.ts - Pagination utilities with cursor support
• lib/events/websocket.ts - WebSocket event monitor for real-time updates
• lib/checkin.ts - Check-in system for event verification

Smart Contract (soroban-contract)

• event_manager/src/lib.rs - Added check_in, add_staff, and is_checked_in functions

Testing

All new functions follow existing code patterns and are compatible with the project's test infrastructure.

Closes #229
Closes #238
Closes #189
Closes #115

[drips-wave]

@dimka90 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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