fix(analytics): add backward compatibility aliases for old method names

The new AnalyticsTracker had different method names than the old useAnalytics hook. Added aliases like trackCheckoutStarted -> checkoutStarted etc. to maintain backward compatibility with existing components.

src/lib/analytics/core/AnalyticsTracker.ts

@@ -100,6 +100,22 @@ export class AnalyticsTracker {
   newsletterSignedUp(email: string, source: string) {
     this.track({ type: "newsletter_signup", email, source });
   }
+
+  // Backward compatibility aliases (old method names)
+  trackProductView = this.productViewed;
+  trackAddToCart = this.addToCart;
+  trackRemoveFromCart = this.removeFromCart;
+  trackCartView = this.cartViewed;
+  trackCheckoutStarted = this.checkoutStarted;
+  trackCheckoutStep = this.checkoutStep;
+  trackOrderCompleted = this.orderCompleted;
+  trackSearch = this.searchPerformed;
+  trackExternalLink = this.externalLinkClicked;
+  trackWishlistAdd = this.wishlistAdded;
+  trackUserLogin = this.userLoggedIn;
+  trackUserRegister = this.userRegistered;
+  trackNewsletterSignup = this.newsletterSignedUp;
+  identifyUser = this.identify;
 }
 
 let trackerInstance: AnalyticsTracker | null = null;