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]/blog/[slug]/page.tsx

@@ -30,11 +30,11 @@ export async function generateMetadata({ params }: BlogPostProps): Promise<Metad
     title: post.frontmatter.title,
     description: description,
     alternates: {
-      canonical: `/${locale}/blog/${slug}`,
+      canonical: `${SITE_URL}/${locale}/blog/${slug}`,
       languages: {
-        de: `/de/blog/${slug}`,
-        en: `/en/blog/${slug}`,
-        'x-default': `/en/blog/${slug}`,
+        de: `${SITE_URL}/de/blog/${slug}`,
+        en: `${SITE_URL}/en/blog/${slug}`,
+        'x-default': `${SITE_URL}/en/blog/${slug}`,
       },
     },
     openGraph: {

app/[locale]/blog/page.tsx

@@ -4,7 +4,7 @@ import { getAllPosts } from '@/lib/blog';
 import { Section, Container, Heading, Card, Badge, Button } from '@/components/ui';
 import Reveal from '@/components/Reveal';
 import { Metadata } from 'next';
-import { getTranslations } from 'next-intl/server';
+import { getTranslations, setRequestLocale } from 'next-intl/server';
 import { SITE_URL } from '@/lib/schema';
 
 interface BlogIndexProps {
@@ -20,11 +20,11 @@ export async function generateMetadata({ params }: BlogIndexProps) {
     title: t('title'),
     description: t('description'),
     alternates: {
-      canonical: `/${locale}/blog`,
+      canonical: `${SITE_URL}/${locale}/blog`,
       languages: {
-        de: '/de/blog',
-        en: '/en/blog',
-        'x-default': '/en/blog',
+        de: `${SITE_URL}/de/blog`,
+        en: `${SITE_URL}/en/blog`,
+        'x-default': `${SITE_URL}/en/blog`,
       },
     },
     openGraph: {
@@ -42,6 +42,7 @@ export async function generateMetadata({ params }: BlogIndexProps) {
 
 export default async function BlogIndex({ params }: BlogIndexProps) {
   const { locale } = await params;
+  setRequestLocale(locale);
   const t = await getTranslations('Blog');
   const posts = await getAllPosts(locale);