feat: add resonance follow-up attacks

src/game/state/battleSaveState.ts

@@ -196,7 +196,7 @@ export function isValidBattleSaveState(state: unknown, options: BattleSaveValida
     return false;
   }
 
-  if (!areAttackIntentsTargetingLiveUnits(attackIntents, units, options)) {
+  if (!areAttackIntentsTargetingLiveUnits(attackIntents, state.actedUnitIds, units, options)) {
     return false;
   }
 
@@ -282,7 +282,7 @@ function isSortieOrderId(value: unknown): value is SortieOrderId {
   return value === 'elite' || value === 'mobile' || value === 'siege';
 }
 
-function isUnitIdArray(value: unknown, options: BattleSaveValidationOptions) {
+function isUnitIdArray(value: unknown, options: BattleSaveValidationOptions): value is string[] {
   return (
     Array.isArray(value) &&
     value.length <= unitReferenceLimit(options) &&
@@ -348,14 +348,17 @@ function areSavedBattleUnitsValid(units: unknown[], options: BattleSaveValidatio
 
 function areAttackIntentsTargetingLiveUnits(
   attackIntents: BattleSaveAttackIntent[],
+  actedUnitIds: string[],
   units: SavedBattleUnitState[],
   options: BattleSaveValidationOptions
 ) {
   const liveUnitIds = new Set(units.filter((unit) => unit.hp > 0).map((unit) => unit.id));
+  const actedUnitIdSet = new Set(actedUnitIds);
   return attackIntents.every(
     (intent) =>
       liveUnitIds.has(intent.attackerId) &&
       liveUnitIds.has(intent.targetId) &&
+      actedUnitIdSet.has(intent.attackerId) &&
       (!options.validAllyUnitIds || options.validAllyUnitIds.has(intent.attackerId)) &&
       (!options.validEnemyUnitIds || options.validEnemyUnitIds.has(intent.targetId))
   );