Issue with dynamically changing theme colors in Nuxt UI using Vue 3

### Description

Hi, I am using Vue 3 and trying to dynamically change the theme color of nuxt-ui. I have the following code:

```typescript
const appConfig = useAppConfig()
appConfig.ui.colors.primary = color
```
However, this doesn’t seem to work as expected. I’m wondering if I’m using it incorrectly. Could you please advise how I can dynamically switch the theme in nuxt-ui in Vue 3?