feat: replace technical drawings with premium animated design elements (DrillOrbit + StratumLines)

Former-commit-id: f56a9d40b6b4068691b1d8851da455da6514fa3c

components/blocks/CompetenceBentoGrid.tsx

@@ -6,6 +6,7 @@ import { motion } from 'framer-motion';
 import { useState, useEffect } from 'react';
 import { Button } from '@/components/ui/Button';
 import { HoverShineOverlay } from '@/components/ui/HoverShineOverlay';
+import { StratumLines } from '@/components/ui/decorations/StratumLines';
 
 interface CompetenceBentoGridProps {
   badge?: string;
@@ -167,6 +168,9 @@ export function CompetenceBentoGrid(props: CompetenceBentoGridProps) {
           })}
         </div>
       </div>
+      {/* Decorative: abstract earth strata / excavation layers */}
+      <StratumLines placement="bottom-left" invert />
+      <StratumLines placement="bottom-right" invert />
     </section>
   );
 }