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/components/InputSlot.vue

@@ -21,7 +21,7 @@
     <!-- Slot Name -->
     <span
       v-if="!dotOnly"
-      class="whitespace-nowrap text-sm font-normal dark-theme:text-[#9FA2BD] text-[#888682]"
+      class="whitespace-nowrap text-sm font-normal dark-theme:text-slate-200 text-stone-200"
     >
       {{ slotData.localized_name || slotData.name || `Input ${index}` }}
     </span>