Feat: Vue Node Slot Improvements (#6359)

## Summary

Several fixes and improvements to the slot behavior on Vue nodes.

## Changes

- **What**: Restore the pseudo-slots, if there are slots being hidden by
collapse
- **What**: Connections while collapsed
- **What**: Display the links in a more reasonable location
- **What**: Fixes styling of linked widgets
- **What**: [~Fix reconnecting logic to prioritize newly disconnected
and now empty
slots~](https://github.com/Comfy-Org/ComfyUI_frontend/pull/6370)

## Review Focus

<!-- Critical design decisions or edge cases that need attention -->

<!-- If this PR fixes an issue, uncomment and update the line below -->
<!-- Fixes #ISSUE_NUMBER -->

## Screenshots (if applicable)


https://github.com/user-attachments/assets/913cfb8f-acdd-4f3d-b619-c280cc11cce5


<!-- Add screenshots or video recording to help explain your changes -->

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6359-WIP-Collapsed-nodes-multislots-29b6d73d3650817289d5f0a8efdade84)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

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

@@ -24,7 +24,12 @@
       <!-- Widget Input Slot Dot -->
 
       <div
-        class="z-10 w-3 opacity-0 transition-opacity duration-150 group-hover:opacity-100"
+        :class="
+          cn(
+            'z-10 w-3 opacity-0 transition-opacity duration-150 group-hover:opacity-100 flex items-center',
+            widget.slotMetadata?.linked && 'opacity-100'
+          )
+        "
       >
         <InputSlot
           v-if="widget.slotMetadata"
@@ -35,7 +40,7 @@
           }"
           :node-id="nodeData?.id != null ? String(nodeData.id) : ''"
           :index="widget.slotMetadata.index"
-          :dot-only="true"
+          dot-only
         />
       </div>
       <!-- Widget Component -->
@@ -140,9 +145,7 @@ const processedWidgets = computed((): ProcessedWidget[] => {
     // This prevents conflicting input sources - when a slot is linked to another
     // node's output, the widget should be read-only to avoid data conflicts
     if (slotMetadata?.linked) {
-      widgetOptions = widget.options
-        ? { ...widget.options, disabled: true }
-        : { disabled: true }
+      widgetOptions = { ...widget.options, disabled: true }
     }
 
     const simplified: SimplifiedWidget = {