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'

app/[locale]/layout.tsx

@@ -2,6 +2,7 @@ import Footer from '@/components/Footer';
 import Header from '@/components/Header';
 import JsonLd from '@/components/JsonLd';
 import AnalyticsProvider from '@/components/analytics/AnalyticsProvider';
+import ScrollDepthTracker from '@/components/analytics/ScrollDepthTracker';
 import CMSConnectivityNotice from '@/components/CMSConnectivityNotice';
 import { RecordModeProvider } from '@/components/record-mode/RecordModeContext';
 import { RecordModeVisuals } from '@/components/record-mode/RecordModeVisuals';
@@ -111,6 +112,7 @@ export default async function LocaleLayout({
 
             <Suspense fallback={null}>
               <AnalyticsProvider />
+              <ScrollDepthTracker />
             </Suspense>
             <ToolCoordinator feedbackEnabled={feedbackEnabled} />
           </RecordModeProvider>