feat(analytics): implement total transparency suite and SEO metadata standardization

- Added global ScrollDepthTracker (25%, 50%, 75%, 100%)
- Implemented ProductEngagementTracker for deep product analytics
- Added field-level tracking to ContactForm and RequestQuoteForm
- Standardized SEO metadata (canonical, alternates, x-default) across all routes
- Created reusable TrackedLink and TrackedButton components for server components
- Fixed 'useAnalytics' hook error in Footer.tsx by adding 'use client'

components/analytics/analytics-events.ts

@@ -1,18 +1,18 @@
 /**
  * Analytics Events Utility
- * 
+ *
  * Centralized definitions for common analytics events and their properties.
  * This helps maintain consistency across the application and makes it easier
  * to track meaningful events.
- * 
+ *
  * @example
  * ```tsx
  * import { useAnalytics } from '@/components/analytics/useAnalytics';
  * import { AnalyticsEvents } from '@/components/analytics/analytics-events';
- * 
+ *
  * function ProductPage() {
  *   const { trackEvent } = useAnalytics();
- * 
+ *
  *   const handleAddToCart = (productId: string, productName: string) => {
  *     trackEvent(AnalyticsEvents.PRODUCT_ADD_TO_CART, {
  *       product_id: productId,
@@ -20,7 +20,7 @@
  *       page: 'product-detail'
  *     });
  *   };
- * 
+ *
  *   return <button onClick={() => handleAddToCart('123', 'Cable')}>Add to Cart</button>;
  * }
  * ```
@@ -31,6 +31,7 @@ export const AnalyticsEvents = {
   PAGE_VIEW: 'pageview',
   PAGE_SCROLL: 'page_scroll',
   PAGE_EXIT: 'page_exit',
+  SCROLL_DEPTH: 'scroll_depth',
 
   // User Interaction Events
   BUTTON_CLICK: 'button_click',
@@ -38,6 +39,7 @@ export const AnalyticsEvents = {
   FORM_SUBMIT: 'form_submit',
   FORM_START: 'form_start',
   FORM_ERROR: 'form_error',
+  FORM_FIELD_FOCUS: 'form_field_focus',
 
   // E-commerce Events
   PRODUCT_VIEW: 'product_view',
@@ -46,6 +48,7 @@ export const AnalyticsEvents = {
   PRODUCT_PURCHASE: 'product_purchase',
   PRODUCT_WISHLIST_ADD: 'product_wishlist_add',
   PRODUCT_WISHLIST_REMOVE: 'product_wishlist_remove',
+  PRODUCT_TAB_SWITCH: 'product_tab_switch',
 
   // Search & Filter Events
   SEARCH: 'search',
@@ -71,6 +74,7 @@ export const AnalyticsEvents = {
   TOGGLE_SWITCH: 'toggle_switch',
   ACCORDION_TOGGLE: 'accordion_toggle',
   TAB_SWITCH: 'tab_switch',
+  TOC_CLICK: 'toc_click',
 
   // Error & Performance Events
   ERROR: 'error',