feat: comprehensive project improvements and fixes

- Fix all TypeScript compilation errors (40+ fixes)
  - Add missing type definitions (TransactionRequest, SafeInfo)
  - Fix TransactionRequestStatus vs TransactionStatus confusion
  - Fix import paths and provider type issues
  - Fix test file errors and mock providers

- Implement comprehensive security features
  - AES-GCM encryption with PBKDF2 key derivation
  - Input validation and sanitization
  - Rate limiting and nonce management
  - Replay attack prevention
  - Access control and authorization

- Add comprehensive test suite
  - Integration tests for transaction flow
  - Security validation tests
  - Wallet management tests
  - Encryption and rate limiter tests
  - E2E tests with Playwright

- Add extensive documentation
  - 12 numbered guides (setup, development, API, security, etc.)
  - Security documentation and audit reports
  - Code review and testing reports
  - Project organization documentation

- Update dependencies
  - Update axios to latest version (security fix)
  - Update React types to v18
  - Fix peer dependency warnings

- Add development tooling
  - CI/CD workflows (GitHub Actions)
  - Pre-commit hooks (Husky)
  - Linting and formatting (Prettier, ESLint)
  - Security audit workflow
  - Performance benchmarking

- Reorganize project structure
  - Move reports to docs/reports/
  - Clean up root directory
  - Organize documentation

- Add new features
  - Smart wallet management (Gnosis Safe, ERC4337)
  - Transaction execution and approval workflows
  - Balance management and token support
  - Error boundary and monitoring (Sentry)

- Fix WalletConnect configuration
  - Handle missing projectId gracefully
  - Add environment variable template

utils/constants.ts

@@ -0,0 +1,118 @@
+/**
+ * Application constants
+ * Centralized location for all magic numbers and configuration values
+ */
+
+// Security Constants
+export const SECURITY = {
+  // Rate Limiting
+  DEFAULT_RATE_LIMIT_REQUESTS: 10,
+  DEFAULT_RATE_LIMIT_WINDOW_MS: 60000, // 1 minute
+  
+  // Message Replay Protection
+  MESSAGE_REPLAY_WINDOW_MS: 1000, // 1 second
+  MESSAGE_TIMESTAMP_CLEANUP_INTERVAL_MS: 300000, // 5 minutes
+  MESSAGE_TIMESTAMP_RETENTION_MS: 300000, // 5 minutes
+  
+  // Transaction
+  TRANSACTION_EXPIRATION_MS: 3600000, // 1 hour
+  MAX_TRANSACTION_DATA_LENGTH: 10000, // bytes
+  MAX_TRANSACTION_VALUE_ETH: 1000000, // 1M ETH
+  MIN_GAS_LIMIT: 21000,
+  MAX_GAS_LIMIT: 10000000, // 10M
+  MIN_GAS_PRICE_GWEI: 1,
+  MAX_GAS_PRICE_GWEI: 1000,
+  
+  // Timeouts
+  GAS_ESTIMATION_TIMEOUT_MS: 15000, // 15 seconds
+  TOKEN_BALANCE_TIMEOUT_MS: 10000, // 10 seconds
+  RELAYER_REQUEST_TIMEOUT_MS: 30000, // 30 seconds
+  
+  // Encryption
+  PBKDF2_ITERATIONS: 100000,
+  ENCRYPTION_KEY_LENGTH: 32, // bytes
+  AES_GCM_IV_LENGTH: 12, // bytes
+} as const;
+
+// Network Constants
+export const NETWORKS = {
+  SUPPORTED_NETWORK_IDS: [1, 5, 137, 42161, 10, 8453, 100, 56, 250, 43114],
+  MAINNET: 1,
+  GOERLI: 5,
+  POLYGON: 137,
+  ARBITRUM: 42161,
+  OPTIMISM: 10,
+  BASE: 8453,
+  GNOSIS: 100,
+  BSC: 56,
+  FANTOM: 250,
+  AVALANCHE: 43114,
+} as const;
+
+// Storage Keys
+export const STORAGE_KEYS = {
+  SMART_WALLETS: "impersonator_smart_wallets",
+  ACTIVE_WALLET: "impersonator_active_wallet",
+  TRANSACTIONS: "impersonator_transactions",
+  DEFAULT_EXECUTION_METHOD: "impersonator_default_execution_method",
+  ENCRYPTION_KEY: "encryption_key",
+  ADDRESS_BOOK: "address-book",
+  // UI Preferences (stored in sessionStorage)
+  SHOW_ADDRESS: "showAddress",
+  APP_URL: "appUrl",
+  TENDERLY_FORK_ID: "tenderlyForkId",
+} as const;
+
+// Default Values
+export const DEFAULTS = {
+  EXECUTION_METHOD: "SIMULATION" as const,
+  THRESHOLD: 1,
+  MIN_OWNERS: 1,
+} as const;
+
+// Validation Constants
+export const VALIDATION = {
+  ADDRESS_MAX_LENGTH: 42,
+  ENS_MAX_LENGTH: 255,
+  TOKEN_DECIMALS_MIN: 0,
+  TOKEN_DECIMALS_MAX: 255,
+} as const;
+
+// Error Messages
+export const ERROR_MESSAGES = {
+  INVALID_ADDRESS: "Invalid Ethereum address",
+  INVALID_NETWORK: "Network not supported",
+  INVALID_TRANSACTION: "Invalid transaction data",
+  RATE_LIMIT_EXCEEDED: "Rate limit exceeded. Please wait before creating another transaction.",
+  DUPLICATE_TRANSACTION: "Duplicate transaction detected",
+  TRANSACTION_EXPIRED: "Transaction has expired",
+  INSUFFICIENT_APPROVALS: "Insufficient approvals for transaction execution",
+  UNAUTHORIZED: "Unauthorized: Caller is not a wallet owner",
+  WALLET_NOT_FOUND: "Wallet not found",
+  OWNER_EXISTS: "Owner already exists",
+  CANNOT_REMOVE_LAST_OWNER: "Cannot remove last owner",
+  THRESHOLD_EXCEEDS_OWNERS: "Threshold cannot exceed owner count",
+  INVALID_THRESHOLD: "Threshold must be at least 1",
+  CONTRACT_AS_OWNER: "Cannot add contract address as owner",
+  ENCRYPTION_FAILED: "Failed to encrypt data",
+  DECRYPTION_FAILED: "Failed to decrypt data",
+  PROVIDER_NOT_AVAILABLE: "Provider not available",
+  SIGNER_NOT_AVAILABLE: "No signer available for direct execution",
+  RELAYER_NOT_AVAILABLE: "No enabled relayer available",
+  GAS_ESTIMATION_FAILED: "Gas estimation failed",
+  TRANSACTION_EXECUTION_FAILED: "Transaction execution failed",
+} as const;
+
+// Success Messages
+export const SUCCESS_MESSAGES = {
+  WALLET_CREATED: "Wallet created successfully",
+  WALLET_CONNECTED: "Wallet connected successfully",
+  OWNER_ADDED: "Owner added successfully",
+  OWNER_REMOVED: "Owner removed successfully",
+  THRESHOLD_UPDATED: "Threshold updated successfully",
+  TRANSACTION_CREATED: "Transaction created successfully",
+  TRANSACTION_APPROVED: "Transaction approved successfully",
+  TRANSACTION_REJECTED: "Transaction rejected successfully",
+  TRANSACTION_EXECUTED: "Transaction executed successfully",
+  TOKEN_ADDED: "Token added successfully",
+} as const;