style: fix linting errors and update README with new tools

- Auto-fix trailing spaces, curly braces, and indentation issues
- Clean up boolean comparisons and code formatting
- README automatically updated with new code injection tools:
  - browser_enable_debug_toolbar: Enable debug toolbar for client identification
  - browser_inject_custom_code: Inject custom JavaScript/CSS code
  - browser_list_injections: List all active code injections
  - browser_disable_debug_toolbar: Disable debug toolbar
  - browser_clear_injections: Remove custom code injections

All linting checks now pass successfully.

test-code-injection.cjs

@@ -0,0 +1,159 @@
+#!/usr/bin/env node
+
+/**
+ * Test script for MCP client identification system
+ * Tests the debug toolbar and custom code injection functionality
+ */
+
+const { createConnection } = require('./lib/index.js');
+const { BrowserContextFactory } = require('./lib/browserContextFactory.js');
+
+async function testCodeInjection() {
+  console.log('🧪 Testing MCP Client Identification System...\n');
+  
+  try {
+    // Create MCP server connection
+    console.log('📡 Creating MCP connection...');
+    const connection = createConnection();
+    
+    // Configure browser with a test project name
+    console.log('🌐 Configuring browser...');
+    await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_configure',
+        arguments: {
+          headless: false, // Show browser for visual verification
+          viewport: { width: 1280, height: 720 }
+        }
+      }
+    });
+    
+    // Enable debug toolbar
+    console.log('🏷️  Enabling debug toolbar...');
+    const toolbarResult = await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_enable_debug_toolbar',
+        arguments: {
+          projectName: 'Test Project A',
+          position: 'top-right',
+          theme: 'dark',
+          minimized: false,
+          showDetails: true,
+          opacity: 0.9
+        }
+      }
+    });
+    console.log('✅ Debug toolbar enabled:', toolbarResult.content[0].text);
+    
+    // Navigate to a test page
+    console.log('🚀 Navigating to test page...');
+    await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_navigate',
+        arguments: {
+          url: 'https://example.com'
+        }
+      }
+    });
+    
+    // Add custom code injection
+    console.log('💉 Adding custom JavaScript injection...');
+    const injectionResult = await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_inject_custom_code',
+        arguments: {
+          name: 'test-alert',
+          type: 'javascript',
+          code: `
+            console.log('[Test Injection] Hello from Test Project A!');
+            // Create a subtle notification
+            const notification = document.createElement('div');
+            notification.style.cssText = \`
+              position: fixed;
+              top: 50px;
+              right: 20px;
+              background: #28a745;
+              color: white;
+              padding: 10px 15px;
+              border-radius: 5px;
+              font-family: Arial;
+              z-index: 1000;
+              font-size: 14px;
+            \`;
+            notification.textContent = 'Custom injection from Test Project A';
+            document.body.appendChild(notification);
+            setTimeout(() => notification.remove(), 3000);
+          `,
+          persistent: true,
+          autoInject: true
+        }
+      }
+    });
+    console.log('✅ Custom code injected:', injectionResult.content[0].text);
+    
+    // List all injections
+    console.log('📋 Listing all active injections...');
+    const listResult = await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_list_injections',
+        arguments: {}
+      }
+    });
+    console.log('📊 Current injections:');
+    listResult.content.forEach(item => console.log('  ', item.text));
+    
+    // Navigate to another page to test auto-injection
+    console.log('\n🔄 Testing auto-injection on new page...');
+    await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_navigate',
+        arguments: {
+          url: 'https://httpbin.org/html'
+        }
+      }
+    });
+    
+    console.log('\n🎉 Test completed successfully!');
+    console.log('👀 Check the browser window to see:');
+    console.log('   - Debug toolbar in top-right corner showing "Test Project A"');
+    console.log('   - Green notification message from custom injection');
+    console.log('   - Both should appear on both pages (example.com and httpbin.org)');
+    console.log('\n💡 The debug toolbar shows:');
+    console.log('   - Project name with green indicator');
+    console.log('   - Session ID (first 12 chars)');
+    console.log('   - Client info');
+    console.log('   - Session uptime');
+    console.log('   - Current hostname');
+    console.log('\n⏳ Browser will stay open for 30 seconds for manual inspection...');
+    
+    // Wait for manual inspection
+    await new Promise(resolve => setTimeout(resolve, 30000));
+    
+    // Clean up
+    console.log('\n🧹 Cleaning up injections...');
+    await connection.request({
+      method: 'tools/call',
+      params: {
+        name: 'browser_clear_injections',
+        arguments: {
+          includeToolbar: true
+        }
+      }
+    });
+    
+    console.log('✨ Test completed and cleaned up successfully!');
+    
+  } catch (error) {
+    console.error('❌ Test failed:', error);
+    process.exit(1);
+  }
+}
+
+// Run the test
+testCodeInjection().catch(console.error);