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

content/de/kompetenzen.mdx

@@ -13,7 +13,7 @@ layout: "fullBleed"
   linkText="Kontakt aufnehmen"
   linkHref="/de/kontakt"
   secondaryCtaLabel="Referenzen ansehen"
-  secondaryCtaHref="/de/kompetenzen#referenzen"
+  secondaryCtaHref="/de/#referenzen"
 />
 
 <HomeCompetenceBentoGrid