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/blocks/JobListingBlock.tsx

@@ -49,11 +49,11 @@ export const JobListingBlock = (props: JobListingBlockProps) => {
     title, 
     showJobs = true,
     showFairs,
-    fairsTitle = 'Nächste Messetermine 2026',
+    fairsTitle = 'Nächste Messetermine',
     fairs = [
-      { name: 'Intersolar München', date: '19. - 21. Juni 2026', type: 'Energie-Messe', location: 'Messe München', booth: 'Halle A3, Stand 110', url: 'https://www.intersolar.de' },
-      { name: 'Windenergietage Linstow', date: '04. - 06. November 2026', type: 'Fachkongress', location: 'Van der Valk Resort Linstow', booth: 'Stand 42', url: 'https://windenergietage.de' },
-      { name: 'Kabelwerkstatt Wiesbaden', date: '02. - 03. Dezember 2026', type: 'Fachmesse', location: 'RheinMain CongressCenter', booth: 'Halle 1, Stand B20' }
+      { name: 'Intersolar München', date: 'Termin folgt', type: 'Energie-Messe', location: 'Messe München' },
+      { name: 'Windenergietage Linstow', date: 'Termin folgt', type: 'Fachkongress', location: 'Linstow' },
+      { name: 'Kabelwerkstatt Wiesbaden', date: 'Termin folgt', type: 'Fachmesse', location: 'Wiesbaden' }
     ],
     emptyStateMessage = 'Aktuell sind alle Positionen besetzt. Senden Sie uns gerne eine Initiativbewerbung!',
     emptyStateLinkText = 'Jetzt Kontakt aufnehmen',