* refactor(stage-web): eliminate the need for resize check, now it's really pure-css
* final optimization: remove unused and remove extra div node
* support movement direction
* feat(stage-web): I Want It Dynamic!
* a hacky way to make the live2d shadow dynamic
* fix types, just use 0 for rafId as a valid raf return will never be 0
* fix type
* try fix type errors in Stage.vue
* remove index
* make index optional
* setMotion also need to make index optional
* fix(ui-transitions): typecheck
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Co-authored-by: LemonNeko <chheese048@gmail.com>