Refactor: Composable disentangling (#5695)

## Summary

Prerequisite refactor/cleanup to use a global store instead of having
nodes throw up events to a parent component that stores a reference to a
singleton service that itself bootstraps and synchronizes with a
separate service to maintain a partially reactive but not fully reactive
set of states that describe some but not all aspects of the nodes on
either the litegraph, the vue side, or both.

## Changes

- **What**: Refactoring, the behavior should not change.
- **Dependencies**: A type utility to help with Vue component props

## Review Focus

Is there something about the current structure that this could affect
that would not be caught by our tests or using the application?

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5695-Refactor-Composable-disentangling-2746d73d365081e6938ce656932f3e36)
by [Unito](https://www.unito.io)

src/composables/useVueFeatureFlags.ts

@@ -2,16 +2,17 @@
  * Vue-related feature flags composable
  * Manages local settings-driven flags and LiteGraph integration
  */
+import { createSharedComposable } from '@vueuse/core'
 import { computed, watch } from 'vue'
 
 import { useSettingStore } from '@/platform/settings/settingStore'
 
 import { LiteGraph } from '../lib/litegraph/src/litegraph'
 
-export const useVueFeatureFlags = () => {
+function useVueFeatureFlagsIndividual() {
   const settingStore = useSettingStore()
 
-  const isVueNodesEnabled = computed(() => {
+  const shouldRenderVueNodes = computed(() => {
     try {
       return settingStore.get('Comfy.VueNodes.Enabled') ?? false
     } catch {
@@ -19,20 +20,20 @@ export const useVueFeatureFlags = () => {
     }
   })
 
-  // Whether Vue nodes should render
-  const shouldRenderVueNodes = computed(() => isVueNodesEnabled.value)
-
-  // Sync the Vue nodes flag with LiteGraph global settings
-  const syncVueNodesFlag = () => {
-    LiteGraph.vueNodesMode = isVueNodesEnabled.value
-  }
-
   // Watch for changes and update LiteGraph immediately
-  watch(isVueNodesEnabled, syncVueNodesFlag, { immediate: true })
+  watch(
+    shouldRenderVueNodes,
+    () => {
+      LiteGraph.vueNodesMode = shouldRenderVueNodes.value
+    },
+    { immediate: true }
+  )
 
   return {
-    isVueNodesEnabled,
-    shouldRenderVueNodes,
-    syncVueNodesFlag
+    shouldRenderVueNodes
   }
 }
+
+export const useVueFeatureFlags = createSharedComposable(
+  useVueFeatureFlagsIndividual
+)