fix: respect node resizable property in vueNodes mode (#7934)

## Summary
Custom nodes like ComfyUI-KJNodes set `this.resizable = false` to
disable resizing. This worked in litegraph but was ignored in vueNodes
mode.

Extract the resizable property from LGraphNode to VueNodeData and use it
to conditionally render the resize handle and block resize interactions.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7934-fix-respect-node-resizable-property-in-vueNodes-mode-2e36d73d365081a0a92ade8b23ee3ce8)
by [Unito](https://www.unito.io)

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -124,7 +124,7 @@
 
     <!-- Resize handle (bottom-right only) -->
     <div
-      v-if="!isCollapsed"
+      v-if="!isCollapsed && nodeData.resizable !== false"
       role="button"
       :aria-label="t('g.resizeFromBottomRight')"
       :class="cn(baseResizeHandleClasses, 'right-0 bottom-0 cursor-se-resize')"
@@ -341,6 +341,7 @@ const handleResizePointerDown = (event: PointerEvent) => {
   if (event.button !== 0) return
   if (!shouldHandleNodePointerEvents.value) return
   if (nodeData.flags?.pinned) return
+  if (nodeData.resizable === false) return
   startResize(event)
 }