Fix Vue slot label colors for light theme (#5529)

* [fix] use stone-200 for Vue slot labels in light theme

Updates Vue node slot label components to use stone-200 color (#828282)
for light theme instead of the previous #888682 color. This improves
theme consistency across the Vue nodes system.

Components updated:
- InputSlot.vue: Input slot labels
- OutputSlot.vue: Output slot labels
- NodeHeader.vue: Collapse/expand icon
- WidgetLayoutField.vue: Widget labels

* Update src/renderer/extensions/vueNodes/components/NodeHeader.vue

Co-authored-by: Alexander Brown <drjkl@comfy.org>

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/renderer/extensions/vueNodes/widgets/components/layout/WidgetLayoutField.vue

@@ -14,7 +14,7 @@ defineProps<{
   >
     <p
       v-if="widget.name"
-      class="text-sm text-[#888682] dark-theme:text-[#9FA2BD] font-normal flex-1 truncate w-20"
+      class="text-sm text-stone-200 dark-theme:text-slate-200 font-normal flex-1 truncate w-20"
     >
       {{ widget.name }}
     </p>