feat(editor): add idle status for embed iframe block (#11142)

To close:
[BS-2843](https://linear.app/affine-design/issue/BS-2843/iframe-embed-block-占位态)
[BS-2844](https://linear.app/affine-design/issue/BS-2844/iframe-embed-block-create-modal-ui-调整)
[BS-2880](https://linear.app/affine-design/issue/BS-2880/spotify-选中时圆角有问题)
[BS-2881](https://linear.app/affine-design/issue/BS-2881/miro-圆角有问题-点击-see-the-board-加载之后就好了)

packages/frontend/core/src/blocksuite/extensions/editor-config/toolbar/index.ts

@@ -48,6 +48,7 @@ import {
 } from '@blocksuite/affine/inlines/reference';
 import {
   BookmarkBlockModel,
+  EmbedIframeBlockModel,
   EmbedLinkedDocModel,
   EmbedSyncedDocModel,
 } from '@blocksuite/affine/model';
@@ -868,6 +869,12 @@ const inlineReferenceToolbarConfig = {
 } as const satisfies ToolbarModuleConfig;
 
 const embedIframeToolbarConfig = {
+  when: (ctx: ToolbarContext) => {
+    const model = ctx.getCurrentModelByType(EmbedIframeBlockModel);
+    if (!model) return false;
+
+    return !!model.props.url;
+  },
   actions: [
     {
       id: 'a.copy-link-and-edit',