feat: distribute animated DrillBitSpinner across all major components as a background watermark

Former-commit-id: ad28a5d93b773be795cd0d73fd6ed2accd257a10

components/blocks/SubCompanyTiles.tsx

@@ -5,6 +5,7 @@ import { motion, Variants } from 'framer-motion';
 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';
 
 interface SubCompanyTilesProps {
   badge?: string;
@@ -198,6 +199,10 @@ export function SubCompanyTiles(props: SubCompanyTilesProps) {
           })}
         </motion.div>
       </div>
+      {/* Decorative: large abstract drill bit spinning slowly in background */}
+      <div className="absolute top-1/3 -translate-y-1/2 -left-64 pointer-events-none opacity-[0.04]">
+        <DrillBitSpinner size={700} duration={25} glow={false} />
+      </div>
       {/* Decorative: abstract HDD bore trajectory */}
       <DrillOrbit side="right" />
     </section>