feat(html): add thumbnail element (#646)

packages/html/src/define/ui/thumbnail.ts

@@ -0,0 +1,9 @@
+import { ThumbnailElement } from '../../ui/thumbnail/thumbnail-element';
+
+customElements.define(ThumbnailElement.tagName, ThumbnailElement);
+
+declare global {
+  interface HTMLElementTagNameMap {
+    [ThumbnailElement.tagName]: ThumbnailElement;
+  }
+}