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/SubmenuPopover.vue

@@ -32,9 +32,9 @@
           :style="{ backgroundColor: subOption.color }"
         />
         <template v-else-if="!subOption.color">
-          <i-lucide:check
+          <i
             v-if="isShapeSelected(subOption)"
-            class="w-4 h-4 flex-shrink-0"
+            class="icon-[lucide--check] w-4 h-4 flex-shrink-0"
           />
           <div v-else class="w-4 flex-shrink-0" />
           <span>{{ subOption.label }}</span>