Restrict enemy usable save keys

src/game/state/battleSaveState.ts

@@ -555,6 +555,7 @@ function isEnemyUsableUseKey(value: unknown, battleId: string, options: BattleSa
     typeof usableId === 'string' &&
     usableId.length > 0 &&
     isKnownUnitId(unitId, options) &&
+    (!options.validEnemyUnitIds || options.validEnemyUnitIds.has(unitId)) &&
     (!options.validUsableIds || options.validUsableIds.has(usableId))
   );
 }