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Consume or activate an item: Blueprint: 
[InventoryComponent] → UseItemAtIndex
   Index: 5
   Return: Success
C++: 
bool bUsed = InventoryComponent->UseItemAtIndex(5);
This will:
  1. Trigger the item’s Consumable Ability (if consumable)
  2. Reduce quantity if bAutoConsumeOnUse is true
  3. Remove from inventory if quantity reaches 0
  4. Apply any item effects