feat: enable 3D enhancement on hero/open MyAbacus modes

Added delightful 3D mode to the hero and open states of MyAbacus:
- Glossy heaven beads + satin earth beads for premium feel
- Dramatic lighting for impact
- Wood grain texture on golden frame
- Hover parallax enabled for interactive depth
- Only applies to hero/open modes (not button mode)

The giant hero abacus on the home page now has satisfying
material rendering and interactive parallax effects.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/components/MyAbacus.tsx

@@ -235,6 +235,25 @@ export function MyAbacus() {
               animated={isOpen || isHeroMode}
               customStyles={isHeroMode ? structuralStyles : trophyStyles}
               onValueChange={setAbacusValue}
+              // 3D Enhancement - delightful mode for hero and open states
+              enhanced3d={isOpen || isHeroMode ? 'delightful' : undefined}
+              material3d={
+                isOpen || isHeroMode
+                  ? {
+                      heavenBeads: 'glossy',
+                      earthBeads: 'satin',
+                      lighting: 'dramatic',
+                      woodGrain: true,
+                    }
+                  : undefined
+              }
+              physics3d={
+                isOpen || isHeroMode
+                  ? {
+                      hoverParallax: true,
+                    }
+                  : undefined
+              }
             />
           </div>
         </div>