Style: Standardize icon use Part 1 (#5947)

## Summary

Remove the mix of class based and component style icons in favor of just
[classes](https://iconify.design/docs/usage/css/tailwind/tailwind4/#basic-usage).

## Changes

- **What**: Migrate existing lucide icons

## Review Focus

What differs between the icons before and now?

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5947-Style-Standardize-icon-use-Part-1-2846d73d365081bfa66ceb6bdaa9ff02)
by [Unito](https://www.unito.io)

---------

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

src/components/graph/selectionToolbox/ConvertToSubgraphButton.vue

@@ -11,7 +11,7 @@
     @click="() => commandStore.execute('Comfy.Graph.UnpackSubgraph')"
   >
     <template #icon>
-      <i-lucide:expand class="w-4 h-4" />
+      <i class="icon-[lucide--expand] w-4 h-4" />
     </template>
   </Button>
   <Button
@@ -26,7 +26,7 @@
     @click="() => commandStore.execute('Comfy.Graph.ConvertToSubgraph')"
   >
     <template #icon>
-      <i-lucide:shrink />
+      <i class="icon-[lucide--shrink]" />
     </template>
   </Button>
 </template>