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/WidgetInputNumberSlider.vue

@@ -2,7 +2,7 @@
   <WidgetLayoutField :widget="widget">
     <div :class="cn(WidgetInputBaseClass, 'flex items-center gap-2 pl-3 pr-2')">
       <Slider
-        :model-value="[localValue]"
+        :model-value="[modelValue]"
         v-bind="filteredProps"
         class="flex-grow text-xs"
         :step="stepValue"
@@ -11,7 +11,7 @@
       />
       <InputNumber
         :key="timesEmptied"
-        :model-value="localValue"
+        :model-value="modelValue"
         v-bind="filteredProps"
         :step="stepValue"
         :min-fraction-digits="precision"
@@ -32,7 +32,6 @@ import InputNumber from 'primevue/inputnumber'
 import { computed, ref } from 'vue'
 
 import Slider from '@/components/ui/slider/Slider.vue'
-import { useNumberWidgetValue } from '@/composables/graph/useWidgetValue'
 import type { SimplifiedWidget } from '@/types/simplifiedWidget'
 import { cn } from '@/utils/tailwindUtil'
 import {
@@ -44,22 +43,16 @@ import { useNumberWidgetButtonPt } from '../composables/useNumberWidgetButtonPt'
 import { WidgetInputBaseClass } from './layout'
 import WidgetLayoutField from './layout/WidgetLayoutField.vue'
 
-const { widget, modelValue } = defineProps<{
+const { widget } = defineProps<{
   widget: SimplifiedWidget<number>
-  modelValue: number
 }>()
 
-const emit = defineEmits<{
-  'update:modelValue': [value: number]
-}>()
-
-// Use the composable for consistent widget value handling
-const { localValue, onChange } = useNumberWidgetValue(widget, modelValue, emit)
+const modelValue = defineModel<number>({ default: 0 })
 
 const timesEmptied = ref(0)
 
 const updateLocalValue = (newValue: number[] | undefined): void => {
-  onChange(newValue ?? [localValue.value])
+  if (newValue?.length) modelValue.value = newValue[0]
 }
 
 const handleNumberInputUpdate = (newValue: number | undefined) => {