feat: overhaul competence pages, unify brand colors, and polish site integrity

- Rewrote all 5 competence pages (Kabeltiefbau, Bohrtechnik, Glasfaser, Planung, Vermessung) with factual data from references
- Unified brand colors: replaced toxic neon green with brand-aligned teal (#10a379)
- Fixed ReferencesSlider injection in dynamic MDX pages
- Enhanced Footer with icon parity, improved branding placement, and unified hover effects
- Refined Header with 3D micro-animations and improved dropdown visibility
- Fixed localized tracking API (rewrites for /stats/api/send)
- Resolved ReferenceErrors in InteractiveGermanyMap and Header state management
- Cleaned reference titles and truncated metadata in lists

app/[locale]/[slug]/page.tsx

@@ -165,6 +165,13 @@ export default async function Page(props: { params: Promise<{ locale: string; sl
   const pageMdxComponents = {
     ...mdxComponents,
     InteractiveGermanyMap: (props: any) => <InteractiveGermanyMap locations={enrichedLocations} {...props} />,
+    HomeReferencesSlider: (props: any) => <HomeReferencesSlider {...props} references={references.map(r => ({
+      id: r.slug,
+      slug: r.slug,
+      title: r.frontmatter.title,
+      category: r.frontmatter.category || 'Projekt',
+      image: r.frontmatter.featuredImage
+    }))} />,
   };
 
   return (