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

components/OGImageTemplate.tsx

@@ -16,7 +16,7 @@ export function OGImageTemplate({
   mode = 'dark',
 }: OGImageTemplateProps) {
   const primaryBlue = '#001a4d';
-  const accentGreen = '#82ed20';
+  const accentGreen = '#10a379';
   const saturatedBlue = '#011dff';
 
   const containerStyle: React.CSSProperties = {