fix(editor): throttle render linked doc card when blockUpdated (#9361)

[BS-2223](https://linear.app/affine-design/issue/BS-2223/性能问题：linked-doc-card-view加载西藏的文档，app-直接挂了)

blocksuite/affine/block-embed/src/common/render-linked-doc.ts

@@ -23,6 +23,12 @@ import { render, type TemplateResult } from 'lit';
 import type { EmbedLinkedDocBlockComponent } from '../embed-linked-doc-block/index.js';
 import type { EmbedSyncedDocCard } from '../embed-synced-doc-block/components/embed-synced-doc-card.js';
 
+// Throttle delay for block updates to reduce unnecessary re-renders
+// - Prevents rapid-fire updates when multiple blocks are updated in quick succession
+// - Ensures UI remains responsive while maintaining performance
+// - Small enough to feel instant to users, large enough to batch updates effectively
+export const RENDER_CARD_THROTTLE_MS = 60;
+
 export function renderLinkedDocInCard(
   card: EmbedLinkedDocBlockComponent | EmbedSyncedDocCard
 ) {