chore: merge blocksuite source code (#9213)

blocksuite/affine/components/src/context-menu/item.ts

@@ -0,0 +1,12 @@
+import { ShadowlessElement } from '@blocksuite/block-std';
+import { SignalWatcher, WithDisposable } from '@blocksuite/global/utils';
+import { property } from 'lit/decorators.js';
+
+import type { Menu } from './menu.js';
+
+export abstract class MenuItem extends SignalWatcher(
+  WithDisposable(ShadowlessElement)
+) {
+  @property({ attribute: false })
+  accessor menu!: Menu;
+}