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/composables/graph/useWidgetValue.ts

@@ -1,156 +0,0 @@
-/**
- * Composable for managing widget value synchronization between Vue and LiteGraph
- * Provides consistent pattern for immediate UI updates and LiteGraph callbacks
- */
-import { computed, toValue, ref, watch } from 'vue'
-import type { Ref } from 'vue'
-
-import type { SimplifiedWidget, WidgetValue } from '@/types/simplifiedWidget'
-import type { MaybeRefOrGetter } from '@vueuse/core'
-
-interface UseWidgetValueOptions<T extends WidgetValue = WidgetValue, U = T> {
-  /** The widget configuration from LiteGraph */
-  widget: SimplifiedWidget<T>
-  /** The current value from parent component (can be a value or a getter function) */
-  modelValue: MaybeRefOrGetter<T>
-  /** Default value if modelValue is null/undefined */
-  defaultValue: T
-  /** Emit function from component setup */
-  emit: (event: 'update:modelValue', value: T) => void
-  /** Optional value transformer before sending to LiteGraph */
-  transform?: (value: U) => T
-}
-
-interface UseWidgetValueReturn<T extends WidgetValue = WidgetValue, U = T> {
-  /** Local value for immediate UI updates */
-  localValue: Ref<T>
-  /** Handler for user interactions */
-  onChange: (newValue: U) => void
-}
-
-/**
- * Manages widget value synchronization with LiteGraph
- *
- * @example
- * ```vue
- * const { localValue, onChange } = useWidgetValue({
- *   widget: props.widget,
- *   modelValue: props.modelValue,
- *   defaultValue: ''
- * })
- * ```
- */
-export function useWidgetValue<T extends WidgetValue = WidgetValue, U = T>({
-  widget,
-  modelValue,
-  defaultValue,
-  emit,
-  transform
-}: UseWidgetValueOptions<T, U>): UseWidgetValueReturn<T, U> {
-  // Ref for immediate UI feedback before value flows back through modelValue
-  const newProcessedValue = ref<T | null>(null)
-
-  // Computed that prefers the immediately processed value, then falls back to modelValue
-  const localValue = computed<T>(
-    () => newProcessedValue.value ?? toValue(modelValue) ?? defaultValue
-  )
-
-  // Clear newProcessedValue when modelValue updates (allowing external changes to flow through)
-  watch(
-    () => toValue(modelValue),
-    () => {
-      newProcessedValue.value = null
-    }
-  )
-
-  // Handle user changes
-  const onChange = (newValue: U) => {
-    // Handle different PrimeVue component signatures
-    let processedValue: T
-    if (transform) {
-      processedValue = transform(newValue)
-    } else {
-      // Ensure type safety - only cast when types are compatible
-      if (
-        typeof newValue === typeof defaultValue ||
-        newValue === null ||
-        newValue === undefined
-      ) {
-        processedValue = (newValue ?? defaultValue) as T
-      } else {
-        console.warn(
-          `useWidgetValue: Type mismatch for widget ${widget.name}. Expected ${typeof defaultValue}, got ${typeof newValue}`
-        )
-        processedValue = defaultValue
-      }
-    }
-
-    // Set for immediate UI feedback
-    newProcessedValue.value = processedValue
-
-    // Emit to parent component
-    emit('update:modelValue', processedValue)
-  }
-
-  return {
-    localValue: localValue as Ref<T>,
-    onChange
-  }
-}
-
-/**
- * Type-specific helper for string widgets
- */
-export function useStringWidgetValue(
-  widget: SimplifiedWidget<string>,
-  modelValue: string | (() => string),
-  emit: (event: 'update:modelValue', value: string) => void
-) {
-  return useWidgetValue({
-    widget,
-    modelValue,
-    defaultValue: '',
-    emit,
-    transform: (value: string | undefined) => String(value || '') // Handle undefined from PrimeVue
-  })
-}
-
-/**
- * Type-specific helper for number widgets
- */
-export function useNumberWidgetValue(
-  widget: SimplifiedWidget<number>,
-  modelValue: number | (() => number),
-  emit: (event: 'update:modelValue', value: number) => void
-) {
-  return useWidgetValue({
-    widget,
-    modelValue,
-    defaultValue: 0,
-    emit,
-    transform: (value: number | number[]) => {
-      // Handle PrimeVue Slider which can emit number | number[]
-      if (Array.isArray(value)) {
-        return value.length > 0 ? (value[0] ?? 0) : 0
-      }
-      return Number(value) || 0
-    }
-  })
-}
-
-/**
- * Type-specific helper for boolean widgets
- */
-export function useBooleanWidgetValue(
-  widget: SimplifiedWidget<boolean>,
-  modelValue: boolean | (() => boolean),
-  emit: (event: 'update:modelValue', value: boolean) => void
-) {
-  return useWidgetValue({
-    widget,
-    modelValue,
-    defaultValue: false,
-    emit,
-    transform: (value: boolean) => Boolean(value)
-  })
-}