feat(widgets): lazy load images in FormDropdown (#5904)

some users may have a very large number of files, so we only need to
request/render the ones that are visible.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5904-feat-widgets-lazy-load-images-in-FormDropdown-2816d73d36508195b283ff469061f3f3)
by [Unito](https://www.unito.io)

Co-authored-by: Claude <noreply@anthropic.com>

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdownMenuItem.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, inject, ref } from 'vue'
 
+import LazyImage from '@/components/common/LazyImage.vue'
 import { cn } from '@/utils/tailwindUtil'
 
 import { AssetKindKey, type LayoutMode } from './types'
@@ -102,10 +103,11 @@ function handleVideoLoad(event: Event) {
         muted
         @loadeddata="handleVideoLoad"
       />
-      <img
+      <LazyImage
         v-else-if="mediaSrc"
         :src="mediaSrc"
-        class="size-full object-cover"
+        :alt="name"
+        image-class="size-full object-cover"
         @load="handleImageLoad"
       />
       <div