fix: DrillOrbit fades in/out at path edges, DrillBitSpinner uses radial mask instead of hard clip

Former-commit-id: 3aea27f3e17984634206ca817d074b18e712933e

components/blocks/SubCompanyTiles.tsx

@@ -6,6 +6,7 @@ import Image from 'next/image';
 import { HoverShineOverlay } from '@/components/ui/HoverShineOverlay';
 import { DrillOrbit } from '@/components/ui/decorations/DrillOrbit';
 import { DrillBitSpinner } from '@/components/ui/decorations/DrillBitSpinner';
+import { DrillTeeth } from '@/components/ui/decorations/DrillTeeth';
 
 interface SubCompanyTilesProps {
   badge?: string;
@@ -205,6 +206,8 @@ export function SubCompanyTiles(props: SubCompanyTilesProps) {
       </div>
       {/* Decorative: abstract HDD bore trajectory */}
       <DrillOrbit side="right" />
+      {/* Organic wave divider */}
+      <DrillTeeth position="bottom" fill="var(--color-neutral-dark)" />
     </section>
   );
 }