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)

blocksuite/affine/blocks/block-embed/src/embed-iframe-block/commands/insert-empty-embed-iframe.ts

@@ -0,0 +1,55 @@
+import type { EmbedIframeBlockProps } from '@blocksuite/affine-model';
+import type { Command } from '@blocksuite/block-std';
+import type { BlockModel } from '@blocksuite/store';
+
+import type { EmbedLinkInputPopupOptions } from '../components/embed-iframe-link-input-popup';
+import { EmbedIframeBlockComponent } from '../embed-iframe-block';
+
+export const insertEmptyEmbedIframeCommand: Command<
+  {
+    place?: 'after' | 'before';
+    removeEmptyLine?: boolean;
+    selectedModels?: BlockModel[];
+    linkInputPopupOptions?: EmbedLinkInputPopupOptions;
+  },
+  {
+    insertedEmbedIframeBlockId: Promise<string>;
+  }
+> = (ctx, next) => {
+  const { selectedModels, place, removeEmptyLine, std, linkInputPopupOptions } =
+    ctx;
+  if (!selectedModels?.length) return;
+
+  const targetModel =
+    place === 'before'
+      ? selectedModels[0]
+      : selectedModels[selectedModels.length - 1];
+
+  const embedIframeBlockProps: Partial<EmbedIframeBlockProps> & {
+    flavour: 'affine:embed-iframe';
+  } = {
+    flavour: 'affine:embed-iframe',
+  };
+
+  const result = std.store.addSiblingBlocks(
+    targetModel,
+    [embedIframeBlockProps],
+    place
+  );
+  if (result.length === 0) return;
+
+  if (removeEmptyLine && targetModel.text?.length === 0) {
+    std.store.deleteBlock(targetModel);
+  }
+
+  next({
+    insertedEmbedIframeBlockId: std.host.updateComplete.then(async () => {
+      const blockComponent = std.view.getBlock(result[0]);
+      if (blockComponent instanceof EmbedIframeBlockComponent) {
+        await blockComponent.updateComplete;
+        blockComponent.toggleLinkInputPopup(linkInputPopupOptions);
+      }
+      return result[0];
+    }),
+  });
+};