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/en/kabeltiefbau.mdx

@@ -0,0 +1,61 @@
+---
+title: "Cable Civil Engineering in Medium and Low Voltage"
+date: "2024-03-20"
+excerpt: "Professional cable civil engineering for medium and low voltage networks: From the construction of cable routes to cable assemblies and street lighting."
+layout: "fullBleed"
+---
+
+<HeroSection
+  badge="Core Competency"
+  title="Cable Civil Engineering"
+  subtitle="Complete infrastructure solutions for medium and low voltage networks"
+  backgroundImage={{ url: '/assets/photos/DSC01123.JPG' }}
+  alignment="center"
+  ctaLabel="Request a project"
+  ctaHref="/en/kontakt"
+/>
+
+<ServiceDetailGrid
+  badge="Service Portfolio"
+  title="Everything for your network"
+  descriptionParagraphs={[
+    "Our services cover the **complete spectrum** for the construction of modern cable routes and energy infrastructure.",
+    "We offer the highest precision, modern machines, and certified experts for every project."
+  ]}
+  panels={[
+    {
+      id: "grabenbau",
+      title: "Trench Construction & Laying",
+      icon: "energy",
+      fullWidth: false,
+      lists: [
+        [
+          "Production of cable and pipe trenches",
+          "Cable laying from 0.4 kV - 110 kV",
+          "Cable assembly 0.4 kV - 30 kV"
+        ]
+      ]
+    },
+    {
+      id: "anlagen",
+      title: "Systems & Lighting",
+      icon: "energy",
+      fullWidth: false,
+      lists: [
+        [
+          "Construction of transformer stations",
+          "Establishment of grounding systems",
+          "Erection of street lighting",
+          "Switching operations"
+        ]
+      ]
+    }
+  ]}
+/>
+
+<CallToAction 
+  title="Do you have a specific project?" 
+  text="We would be happy to advise you on all questions regarding cable civil engineering and line laying."
+  buttonText="Contact us"
+  buttonLink="/en/kontakt"
+/>