refactor(blocks): improve state initialization in EmbedLinkedDocBlock…

…Component (#8354)

Closes [BS-1417](https://linear.app/affine-design/issue/BS-1417/在-shared-doc-里，card-view-或者-embed-view-的-linked-doc-均无法正常显示)

packages/blocks/src/embed-linked-doc-block/embed-linked-doc-block.ts

@@ -37,10 +37,21 @@ export class EmbedLinkedDocBlockComponent extends EmbedBlockComponent<EmbedLinke
   static override styles = styles;
 
   private _load = async () => {
-    this._loading = true;
-    this.isError = false;
-    this.isNoteContentEmpty = true;
-    this.isBannerEmpty = true;
+    const {
+      loading = true,
+      isError = false,
+      isBannerEmpty = true,
+      isNoteContentEmpty = true,
+    } = this.resetState();
+
+    this._loading = loading;
+    this.isError = isError;
+    this.isBannerEmpty = isBannerEmpty;
+    this.isNoteContentEmpty = isNoteContentEmpty;
+
+    if (!this._loading) {
+      return;
+    }
 
     const linkedDoc = this.linkedDoc;
     if (!linkedDoc) {
@@ -445,6 +456,15 @@ export class EmbedLinkedDocBlockComponent extends EmbedBlockComponent<EmbedLinke
     );
   }
 
+  resetState(): {
+    loading?: boolean;
+    isError?: boolean;
+    isNoteContentEmpty?: boolean;
+    isBannerEmpty?: boolean;
+  } {
+    return {};
+  }
+
   override updated() {
     // update card style when linked doc deleted
     const linkedDoc = this.linkedDoc;