feat: cleanup of obsolete code

src/components/TresCanvas.ts

@@ -57,7 +57,6 @@ export const TresCanvas = defineComponent<TresCanvasProps>({
     const { setState } = useTres()
 
     setState('scene', scene)
-    setState('canvas', canvas)
 
     onUnmounted(() => {
       setState('renderer', null)

src/composables/useRaycaster/index.ts

@@ -1,7 +1,6 @@
 import { useTres } from '/@/composables'
-import { MaybeElementRef, unrefElement } from '@vueuse/core'
 import { Raycaster, Vector2 } from 'three'
-import { onUnmounted, Ref, ref, ShallowRef, shallowRef, watchEffect } from 'vue'
+import { Ref, ref, ShallowRef, shallowRef } from 'vue'
 
 const raycaster = shallowRef(new Raycaster())
 const pointer = ref(new Vector2())