fix: use item name as key for equipped items list

item.type only has three possible values (weapon/armour/trinket).
Using it as a React key is safe in practice because the equipment system
enforces one item per slot, but item.name is a stable, semantically
correct unique identifier that does not rely on that invariant.

apps/web/src/components/game/characterPage.tsx

@@ -243,7 +243,7 @@ const CharacterPage = ({ discordId }: CharacterPageProperties): JSX.Element => {
                 return (
                   <div
                     className="character-page-equipment-item"
-                    key={item.type}
+                    key={item.name}
                   >
                     <div className="character-page-equipment-header">
                       <span className="character-page-equipment-slot">