Fix: Simplify the widget state logic (#6741)

## Summary

Fixes the case where a value is updated in the graph but the result
doesn't reflect on the widget representation on the relevant node.

## Changes

- **What**: Uses vanilla Vue utilities instead of a special utility
- **What**: Fewer places where state could be desynced.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6741-Fix-WIP-Simplify-the-widget-state-logic-2af6d73d36508160b729db50608a2ea9)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/renderer/extensions/vueNodes/widgets/components/WidgetAudioUI.vue

@@ -25,7 +25,7 @@ import WidgetSelect from './WidgetSelect.vue'
 import AudioPreviewPlayer from './audio/AudioPreviewPlayer.vue'
 
 const props = defineProps<{
-  widget: SimplifiedWidget<string | number | undefined>
+  widget: SimplifiedWidget<string | undefined>
   readonly?: boolean
   nodeId: string
 }>()