Show value above plus button

Display the actual value of each power of three above the plus button in the balanced ternary game.

src/components/BalancedTernaryGame.tsx

@@ -172,6 +172,9 @@ const BalancedTernaryGame: React.FC<BalancedTernaryGameProps> = ({ showSocialSha
       <div className="grid grid-cols-8 gap-3">
         {POWERS_OF_THREE.map((power, index) => (
           <div key={power} className="flex flex-col items-center space-y-2">
+            {/* Power value */}
+            <span className="text-xs text-muted-foreground font-medium">{power}</span>
+            
             {/* Add button */}
             <Button
               variant="outline"