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

styles/globals.css

@@ -19,10 +19,10 @@
   --color-secondary: #003d82;
   --color-secondary-light: #0056b3;
 
-  --color-accent: #82ed20;
-  /* Sustainability Green */
-  --color-accent-dark: #14532d;
-  --color-accent-light: #f0f9e6;
+  --color-accent: #10a379;
+  /* Brand Aligned Accent */
+  --color-accent-dark: #0e7a5c;
+  --color-accent-light: #e6f5f0;
 
   --color-neutral: #f8f9fa;
   --color-neutral-light: #ffffff;