fix(Core/Combat): Immediately reselect victim after taunt aura update (#25254)

Co-authored-by: blinkysc <blinkysc@users.noreply.github.com>

src/server/game/Combat/ThreatManager.cpp

@@ -540,6 +540,11 @@ void ThreatManager::TauntUpdate()
 
     // taunt aura update also re-evaluates all suppressed states (retail behavior)
     EvaluateSuppressed(true);
+
+    // immediately reselect victim so taunt takes effect without waiting
+    // for the next THREAT_UPDATE_INTERVAL (1 s) timer tick
+    UpdateVictim();
+    _updateTimer = THREAT_UPDATE_INTERVAL;
 }
 
 void ThreatManager::SetTauntStateForTesting(

src/server/game/Combat/ThreatManager.h

@@ -182,6 +182,8 @@ public:
     // Test-only: directly set taunt state on a threat ref
     // Uses uint32 to avoid incomplete-type issue with ThreatReference
     void SetTauntStateForTesting(Unit* target, uint32 state);
+    // Immediately reselect victim (bypasses 1-second Update timer)
+    void UpdateVictimForTesting() { UpdateVictim(); }
 
     ///== REDIRECT SYSTEM ==
     void RegisterRedirectThreat(uint32 spellId, ObjectGuid const& victim, uint32 pct);