fix: context menu not opening when right-clicking different Vue nodes (#7644)

## Summary
- Fixed issue where right-clicking on one Vue node then another would
close the context menu instead of repositioning it
- Added `showNodeOptions` function that always shows the menu at the new
position (used for contextmenu events)
- Kept `toggleNodeOptions` for the "More Options" button where toggle
behavior is expected

## Test plan
- [ ] Right-click on a Vue node to open context menu
- [ ] Right-click on a different Vue node - menu should immediately show
for the new node
- [ ] Click "More Options" button when menu is open - should close the
menu
- [ ] Click "More Options" button when menu is closed - should open the
menu



https://github.com/user-attachments/assets/bb31c2e4-12b4-4786-96ac-23b1e2b4daa0



┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7644-fix-context-menu-not-opening-when-right-clicking-different-Vue-nodes-2ce6d73d36508145bc30fe6947b6808a)
by [Unito](https://www.unito.io)

src/composables/graph/useMoreOptionsMenu.ts

@@ -55,11 +55,23 @@ export function toggleNodeOptions(event: Event) {
   }
 }
 
+/**
+ * Show the node options popover (always shows, doesn't toggle)
+ * Use this for contextmenu events where we always want to show at the new position
+ * @param event - The trigger event (must be MouseEvent for position)
+ */
+export function showNodeOptions(event: MouseEvent) {
+  if (nodeOptionsInstance?.show) {
+    nodeOptionsInstance.show(event)
+  }
+}
+
 /**
  * Hide the node options popover
  */
 interface NodeOptionsInstance {
   toggle: (event: Event) => void
+  show: (event: MouseEvent) => void
   hide: () => void
   isOpen: Ref<boolean>
 }