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

scripts/check-security-headers.js

@@ -0,0 +1,124 @@
+#!/usr/bin/env node
+
+/**
+ * Security Headers Check Script
+ * Verifies that security headers are properly configured
+ */
+
+const https = require('https');
+const http = require('http');
+const { URL } = require('url');
+
+const REQUIRED_HEADERS = {
+  'strict-transport-security': 'HSTS',
+  'x-frame-options': 'X-Frame-Options',
+  'x-content-type-options': 'X-Content-Type-Options',
+  'x-xss-protection': 'X-XSS-Protection',
+  'referrer-policy': 'Referrer-Policy',
+  'content-security-policy': 'Content-Security-Policy',
+  'permissions-policy': 'Permissions-Policy',
+};
+
+const OPTIONAL_HEADERS = {
+  'x-dns-prefetch-control': 'X-DNS-Prefetch-Control',
+};
+
+function checkHeaders(url) {
+  return new Promise((resolve, reject) => {
+    const parsedUrl = new URL(url);
+    const client = parsedUrl.protocol === 'https:' ? https : http;
+
+    const options = {
+      hostname: parsedUrl.hostname,
+      port: parsedUrl.port || (parsedUrl.protocol === 'https:' ? 443 : 80),
+      path: parsedUrl.pathname,
+      method: 'HEAD',
+      timeout: 5000,
+    };
+
+    const req = client.request(options, (res) => {
+      const headers = res.headers;
+      const results = {
+        url,
+        present: {},
+        missing: [],
+        warnings: [],
+      };
+
+      // Check required headers
+      for (const [header, name] of Object.entries(REQUIRED_HEADERS)) {
+        if (headers[header] || headers[name]) {
+          results.present[header] = headers[header] || headers[name];
+        } else {
+          results.missing.push(name);
+        }
+      }
+
+      // Check optional headers
+      for (const [header, name] of Object.entries(OPTIONAL_HEADERS)) {
+        if (!headers[header] && !headers[name]) {
+          results.warnings.push(`${name} (optional)`);
+        }
+      }
+
+      resolve(results);
+    });
+
+    req.on('error', reject);
+    req.on('timeout', () => {
+      req.destroy();
+      reject(new Error('Request timeout'));
+    });
+
+    req.end();
+  });
+}
+
+async function main() {
+  const url = process.argv[2] || 'http://localhost:3000';
+  console.log(`Checking security headers for ${url}...\n`);
+
+  try {
+    const results = await checkHeaders(url);
+
+    console.log('Security Headers Status:');
+    console.log('='.repeat(50));
+
+    if (results.missing.length === 0) {
+      console.log('✅ All required headers present:');
+      for (const [header] of Object.entries(REQUIRED_HEADERS)) {
+        if (results.present[header]) {
+          console.log(`   ✓ ${REQUIRED_HEADERS[header]}`);
+        }
+      }
+    } else {
+      console.log('❌ Missing required headers:');
+      results.missing.forEach(header => {
+        console.log(`   ✗ ${header}`);
+      });
+    }
+
+    if (results.warnings.length > 0) {
+      console.log('\n⚠️  Optional headers not present:');
+      results.warnings.forEach(header => {
+        console.log(`   - ${header}`);
+      });
+    }
+
+    console.log('\n' + '='.repeat(50));
+
+    if (results.missing.length === 0) {
+      console.log('✅ Security headers check passed!');
+      process.exit(0);
+    } else {
+      console.log('❌ Security headers check failed!');
+      process.exit(1);
+    }
+  } catch (error) {
+    console.error('Error checking headers:', error.message);
+    console.log('\nNote: Make sure the server is running at the specified URL');
+    process.exit(1);
+  }
+}
+
+main();