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

__tests__/nonceManager.test.ts

@@ -0,0 +1,110 @@
+/**
+ * Nonce manager tests
+ * Note: These tests require a mock provider
+ */
+
+import { NonceManager } from "../utils/security";
+import { ethers } from "ethers";
+
+// Mock provider
+class MockProvider extends ethers.providers.BaseProvider {
+  private transactionCounts: Map<string, number> = new Map();
+
+  constructor() {
+    super(ethers.providers.getNetwork(1)); // Mainnet network
+  }
+
+  setTransactionCount(address: string, count: number) {
+    this.transactionCounts.set(address.toLowerCase(), count);
+  }
+
+  async getTransactionCount(address: string, blockTag?: string): Promise<number> {
+    return this.transactionCounts.get(address.toLowerCase()) || 0;
+  }
+
+  // Required by BaseProvider
+  async perform(method: string, params: any): Promise<any> {
+    throw new Error("Not implemented");
+  }
+}
+
+describe("NonceManager", () => {
+  let provider: MockProvider;
+  let nonceManager: NonceManager;
+
+  beforeEach(() => {
+    provider = new MockProvider();
+    nonceManager = new NonceManager(provider as any);
+  });
+
+  it("should get next nonce for new address", async () => {
+    const address = "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb";
+    provider.setTransactionCount(address, 0);
+    
+    const nonce = await nonceManager.getNextNonce(address);
+    expect(nonce).toBe(0);
+  });
+
+  it("should increment nonce after use", async () => {
+    const address = "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb";
+    provider.setTransactionCount(address, 5);
+    
+    const nonce1 = await nonceManager.getNextNonce(address);
+    expect(nonce1).toBe(5);
+    
+    const nonce2 = await nonceManager.getNextNonce(address);
+    expect(nonce2).toBe(6);
+    
+    const nonce3 = await nonceManager.getNextNonce(address);
+    expect(nonce3).toBe(7);
+  });
+
+  it("should use higher value between stored and on-chain", async () => {
+    const address = "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb";
+    
+    // Set stored nonce to 10
+    await nonceManager.getNextNonce(address);
+    await nonceManager.getNextNonce(address);
+    // Now stored should be 2
+    
+    // Set on-chain to 5
+    provider.setTransactionCount(address, 5);
+    
+    // Should use 5 (higher)
+    const nonce = await nonceManager.getNextNonce(address);
+    expect(nonce).toBe(5);
+  });
+
+  it("should refresh nonce from chain", async () => {
+    const address = "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb";
+    
+    // Set initial nonce
+    provider.setTransactionCount(address, 3);
+    await nonceManager.getNextNonce(address);
+    
+    // Update on-chain
+    provider.setTransactionCount(address, 10);
+    
+    // Refresh
+    const refreshed = await nonceManager.refreshNonce(address);
+    expect(refreshed).toBe(10);
+    
+    // Next nonce should be 11
+    const next = await nonceManager.getNextNonce(address);
+    expect(next).toBe(11);
+  });
+
+  it("should track multiple addresses independently", async () => {
+    const address1 = "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb";
+    const address2 = "0x8ba1f109551bD432803012645Hac136c22C9e8";
+    
+    provider.setTransactionCount(address1, 0);
+    provider.setTransactionCount(address2, 5);
+    
+    const nonce1 = await nonceManager.getNextNonce(address1);
+    const nonce2 = await nonceManager.getNextNonce(address2);
+    
+    expect(nonce1).toBe(0);
+    expect(nonce2).toBe(5);
+  });
+});