feat(editor): add experimental feature citation (#11984)

Closes: [BS-3122](https://linear.app/affine-design/issue/BS-3122/footnote-definition-adapter-适配)
Closes: [BS-3123](https://linear.app/affine-design/issue/BS-3123/几个-block-card-view-适配-footnote-态)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced a new citation card component and web element for displaying citations.
  - Added support for citation-style rendering in attachment, bookmark, and linked document blocks.
  - Enabled citation parsing from footnote definitions in markdown for attachments, bookmarks, and linked docs.
  - Added a feature flag to enable or disable citation features.
  - Provided new toolbar logic to disable downloads for citation-style attachments.

- **Improvements**
  - Updated block models and properties to support citation identifiers.
  - Added localization and settings for the citation experimental feature.
  - Enhanced markdown adapters to recognize and process citation footnotes.
  - Included new constants and styles for citation card display.

- **Bug Fixes**
  - Ensured readonly state is respected in block interactions and rendering for citation blocks.

- **Documentation**
  - Added exports and effects for new citation components and features.

- **Tests**
  - Updated snapshots to include citation-related properties in block data.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/inlines/footnote/src/footnote-node/footnote-node.ts

@@ -54,6 +54,7 @@ export class AffineFootnoteNode extends WithDisposable(ShadowlessElement) {
         text-overflow: ellipsis;
         font-family: ${unsafeCSS(baseTheme.fontSansFamily)};
         transition: background 0.3s ease-in-out;
+        transform: translateY(-0.2em);
       }
     }
 
@@ -137,10 +138,6 @@ export class AffineFootnoteNode extends WithDisposable(ShadowlessElement) {
   };
 
   private readonly _handleDocReference = (docId: string) => {
-    if (this.readonly) {
-      return;
-    }
-
     this.std
       .getOptional(PeekViewProvider)
       ?.peek({