Highlight summoned trader

[Rad586]

With "Wandering Trader Horn" module on, player can summon a wandering trader using "sing" horn.
And what's better, the trader won't spawn on your face, instead, he was summoned a few blocks away, and finds his way to you.
However, if the trader can't reach player, the one used the horn will be so confused, thinking it's a bug or something.

So it would be cool to make the trader glow on summon.

Alt 1: if player blows the sing horn in its summon cooldown period, it will highlight the trader being summoned.
Alt 2: after X seconds, if the one using horn wasn't near the summoned trader, the trader will be highlighted.