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__/rateLimiter.test.ts

@@ -0,0 +1,100 @@
+/**
+ * Rate limiter tests
+ */
+
+import { RateLimiter } from "../utils/security";
+
+describe("RateLimiter", () => {
+  let limiter: RateLimiter;
+
+  beforeEach(() => {
+    limiter = new RateLimiter(5, 1000); // 5 requests per 1000ms
+  });
+
+  it("should allow requests within limit", () => {
+    const key = "test-key";
+    
+    expect(limiter.checkLimit(key)).toBe(true);
+    expect(limiter.checkLimit(key)).toBe(true);
+    expect(limiter.checkLimit(key)).toBe(true);
+    expect(limiter.checkLimit(key)).toBe(true);
+    expect(limiter.checkLimit(key)).toBe(true);
+  });
+
+  it("should reject requests exceeding limit", () => {
+    const key = "test-key";
+    
+    // Make 5 requests (at limit)
+    for (let i = 0; i < 5; i++) {
+      expect(limiter.checkLimit(key)).toBe(true);
+    }
+    
+    // 6th request should be rejected
+    expect(limiter.checkLimit(key)).toBe(false);
+  });
+
+  it("should reset after window expires", async () => {
+    const key = "test-key";
+    
+    // Fill up the limit
+    for (let i = 0; i < 5; i++) {
+      limiter.checkLimit(key);
+    }
+    
+    // Should be at limit
+    expect(limiter.checkLimit(key)).toBe(false);
+    
+    // Wait for window to expire
+    await new Promise(resolve => setTimeout(resolve, 1100));
+    
+    // Should allow requests again
+    expect(limiter.checkLimit(key)).toBe(true);
+  });
+
+  it("should track different keys independently", () => {
+    const key1 = "key1";
+    const key2 = "key2";
+    
+    // Fill up key1
+    for (let i = 0; i < 5; i++) {
+      limiter.checkLimit(key1);
+    }
+    
+    // key1 should be at limit
+    expect(limiter.checkLimit(key1)).toBe(false);
+    
+    // key2 should still have full limit
+    expect(limiter.checkLimit(key2)).toBe(true);
+  });
+
+  it("should reset specific key", () => {
+    const key = "test-key";
+    
+    // Fill up the limit
+    for (let i = 0; i < 5; i++) {
+      limiter.checkLimit(key);
+    }
+    
+    expect(limiter.checkLimit(key)).toBe(false);
+    
+    // Reset
+    limiter.reset(key);
+    
+    // Should allow requests again
+    expect(limiter.checkLimit(key)).toBe(true);
+  });
+
+  it("should handle rapid requests", () => {
+    const key = "test-key";
+    
+    // Make rapid requests
+    const results: boolean[] = [];
+    for (let i = 0; i < 10; i++) {
+      results.push(limiter.checkLimit(key));
+    }
+    
+    // First 5 should be true, rest false
+    expect(results.slice(0, 5).every(r => r === true)).toBe(true);
+    expect(results.slice(5).every(r => r === false)).toBe(true);
+  });
+});