Add Web3 Security Hardening and Transaction Validation

[godwinameh]

Issue: Wallet connections and transaction handling lack comprehensive security validations, rate limiting, and protection against common Web3 attack vectors.

Business Impact:

• Critical security vulnerabilities exposing users to financial losses
• Reputational damage from security incidents
• Regulatory compliance risks for financial transactions
• Potential for smart contract exploitation

Technical Requirements:

• Implement wallet connection validation and verification
• Add transaction signing validation and confirmation flows
• Establish rate limiting for sensitive operations
• Add protection against phishing and signature spoofing attacks
• Implement transaction monitoring and anomaly detection
• Add security audit logging for all Web3 interactions

Files: src/components/WalletConnector.tsx, wallet-related components, transaction handlers
Acceptance Criteria:

• All wallet connections validated with domain verification
• Transaction details clearly displayed before user confirmation
• Rate limiting implemented for connection attempts and transactions
• Phishing protection mechanisms in place
• Security audit trail for all Web3 interactions
• Integration with blockchain security services (e.g., Chainalysis)
• Regular security audits and penetration testing