test(useTexture): remove unused Vue import in test file

- Remove unnecessary `nextTick` import from Vue
- Simplify test file dependencies
- Maintain clean and focused test imports

src/composables/useTexture/useTexture.test.ts

@@ -1,7 +1,6 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { LoadingManager, Texture, TextureLoader } from 'three'
 import { useTexture } from '.'
-import { nextTick } from 'vue'
 
 const flushPromises = () => new Promise(resolve => setTimeout(resolve, 0))