refactor: update player marker display to show label if available for improved clarity

client/src/components/Map3D.jsx

@@ -978,7 +978,7 @@ function PlayerMarker({ player }) {
         outlineWidth={0.05}
         outlineColor="#000000"
       >
-        Player {player.playerID}
+        {player.label || `Player ${player.playerID}`}
       </Text>
     </group>
   );