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/referenzen/boerde.mdx

@@ -1,12 +1,14 @@
 ---
-title: "Breitbandausbau FTTH, Landkreis Börde"
+title: "Broadband Expansion FTTH, Börde District"
 client: "EKN Breitband GmbH & Co. KG"
-date: "2026-01-01"
-dateString: "seit 05/2019"
-location: "Landkreis Börde"
+date: "2019-05-01"
+dateString: "Since 05/2019"
+location: "Börde District"
 featuredImage: "/assets/photos/etib_ingenieure_tiefbau_solar_pv_planung_vermessung_gis-294.jpg"
 ---
 
-- 109.000 m Leitungstrasse herstellen (Tiefbau/HDD)
-- 63 Stück Aufstellung Netzverteiler
-- 747 Stück Herstellung Hausanschlüsse
+- 109,000 m production of cable route (civil engineering/HDD)
+- 63 units installation of network distributors
+- 747 units production of house connections
+- Coordination and realization of the entire route guidance
+- Documentation and acceptance of the house connections