fix(Core/AI): fix OnSpellFailed crash on TempSummon despawn (#25036)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

src/server/game/Entities/Unit/Unit.cpp

@@ -4209,6 +4209,8 @@ void Unit::InterruptSpell(CurrentSpellTypes spellType, bool withDelayed, bool wi
             spell->SetReferencedFromCurrent(false);
         }
 
+        if (IsCreature() && IsAIEnabled)
+            ToCreature()->AI()->OnSpellFailed(spell->GetSpellInfo());
     }
 }
 

src/server/game/Spells/Spell.cpp

@@ -3733,11 +3733,6 @@ void Spell::cancel(bool bySelf)
 
     sScriptMgr->OnSpellCastCancel(this, m_caster, m_spellInfo, bySelf);
 
-    // Call CreatureAI hook OnSpellFailed only for true interrupts/cancels, not prepare-time failures
-    if (Creature* creatureCaster = m_caster->ToCreature())
-        if (creatureCaster->IsAIEnabled)
-            creatureCaster->AI()->OnSpellFailed(m_spellInfo);
-
     finish(false);
 }