feat(editor): extensionize clipboards (#11172)

blocksuite/affine/all/src/extensions/preview-specs.ts

@@ -1,6 +1,7 @@
 import {
   PreviewEdgelessRootBlockSpec,
   PreviewPageRootBlockSpec,
+  ReadOnlyClipboard,
 } from '@blocksuite/affine-block-root';
 import type { ExtensionType } from '@blocksuite/store';
 
@@ -12,9 +13,11 @@ import {
 export const PreviewEdgelessEditorBlockSpecs: ExtensionType[] = [
   PreviewEdgelessRootBlockSpec,
   EdgelessFirstPartyBlockSpecs,
+  ReadOnlyClipboard,
 ].flat();
 
 export const PreviewPageEditorBlockSpecs: ExtensionType[] = [
   PreviewPageRootBlockSpec,
   PageFirstPartyBlockSpecs,
+  ReadOnlyClipboard,
 ].flat();