Chrono Ark EA 1.9f - hot fix

- Memory optimization has been performed.
- Fixed a bug where the next story could be skipped while the story was not in progress.
- Modified so that when Lucy participates in battle during the story, she has a common healing skill.
- Fixed an issue where the BGM was overlapped during the beginning of the story.
- After replaying the story, the phenomenon of stopping with a black screen has been fixed.
- Fixed the phenomenon that the stage BGM was played during story replay.
- Fixed an issue where loading would fail if saved during a challenge.
- Fixed the phenomenon that the background shakes during dialogue progress after a certain story progresses.