[backport cloud/1.35] fix: expand assets dropdown body to show entire "no results placeholder" (#7718)

Backport of #7586 to `cloud/1.35`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7718-backport-cloud-1-35-fix-expand-assets-dropdown-body-to-show-entire-no-results-placeho-2d16d73d3650815b9639c4bfc977e552)
by [Unito](https://www.unito.io)

Co-authored-by: Rizumu Ayaka <rizumu@ayaka.moe>

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

@@ -69,10 +69,11 @@ const searchQuery = defineModel<string>('searchQuery')
         <div class="pointer-events-none absolute inset-x-3 top-0 z-10 h-5" />
         <div
           v-if="items.length === 0"
-          class="absolute inset-0 flex items-center justify-center"
+          class="h-50 col-span-full flex items-center justify-center"
         >
           <i
             :title="$t('g.noItems')"
+            :aria-label="$t('g.noItems')"
             class="icon-[lucide--circle-off] size-30 text-zinc-500/20"
           />
         </div>