feat(analytics): enhance Google Analytics with privacy compliance and comprehensive tracking

- Add automatic route change tracking for SPA navigation
- Implement Cookie consent banner for GDPR compliance
- Add performance tracking (LCP, FID, CLS Web Vitals)
- Add outbound link click tracking
- Integrate contact form submission tracking with conversion events
- Add CTA button click tracking in hero section
- Integrate error tracking in ErrorBoundary component
- Extend analytics utility library with 15+ tracking functions
- Configure IP anonymization and privacy settings
- Remove unused test files and deployment scripts
- Update case studies to include only specified cases
- Fix mobile navigation active state issues
- Fix lint errors in test files and components

BREAKING CHANGE: Google Analytics now requires user consent before tracking

src/components/ui/back-button.test.tsx

@@ -1,17 +1,27 @@
-import { describe, it, expect, beforeEach, jest } from '@jest/globals';
+import { describe, it, expect, jest, beforeEach } from '@jest/globals';
 import { render, screen, fireEvent } from '@testing-library/react';
 import '@testing-library/jest-dom';
 import { BackButton } from './back-button';
 
-jest.mock('next/navigation', () => ({
-  useRouter: () => ({
-    back: jest.fn(),
-  }),
-}));
-
 describe('BackButton', () => {
+  const mockBack = jest.fn();
+
   beforeEach(() => {
-    jest.clearAllMocks();
+    mockBack.mockClear();
+    // Mock window.history.back
+    Object.defineProperty(window, 'history', {
+      value: {
+        back: mockBack,
+        forward: jest.fn(),
+        go: jest.fn(),
+        length: 1,
+        pushState: jest.fn(),
+        replaceState: jest.fn(),
+        scrollRestoration: 'auto',
+        state: null,
+      },
+      writable: true,
+    });
   });
 
   describe('Rendering', () => {
@@ -33,16 +43,11 @@ describe('BackButton', () => {
   });
 
   describe('Interaction', () => {
-    it('should call router.back() when clicked', () => {
-      const mockBack = jest.fn();
-      jest.spyOn(require('next/navigation'), 'useRouter').mockReturnValue({
-        back: mockBack,
-      });
-
+    it('should call window.history.back() when clicked', () => {
       render(<BackButton />);
       fireEvent.click(screen.getByRole('button'));
       
-      expect(mockBack).toHaveBeenCalled();
+      expect(mockBack).toHaveBeenCalledTimes(1);
     });
   });
 

src/components/ui/error-boundary.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { Component, ReactNode } from 'react';
+import { trackError } from '@/lib/analytics';
 
 interface Props {
   children: ReactNode;
@@ -24,6 +25,7 @@ export class ErrorBoundary extends Component<Props, State> {
 
   componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
     console.error('Error caught by boundary:', error, errorInfo);
+    trackError('react_error', error.message, true);
   }
 
   render() {