fix(core): ai chat opening and append card (#7322)

Closes: [BS-642](https://linear.app/affine-design/issue/BS-642/continue-with-ai-：-侧边栏关闭的情况下，先唤起-侧边栏，同时插入选中的内容)

https://github.com/toeverything/AFFiNE/assets/27926/3022d808-d560-4bc8-8a04-735b76056121

packages/frontend/core/src/modules/multi-tab-sidebar/multi-tabs/sidebar-tab.ts

@@ -4,6 +4,7 @@ export type SidebarTabName = 'outline' | 'frame' | 'chat' | 'journal';
 
 export interface SidebarTabProps {
   editor: AffineEditorContainer | null;
+  onLoad: ((component: HTMLElement) => void) | null;
 }
 
 export interface SidebarTab {

packages/frontend/core/src/modules/multi-tab-sidebar/multi-tabs/tabs/chat.tsx

@@ -7,7 +7,7 @@ import type { SidebarTab, SidebarTabProps } from '../sidebar-tab';
 import * as styles from './chat.css';
 
 // A wrapper for CopilotPanel
-const EditorChatPanel = ({ editor }: SidebarTabProps) => {
+const EditorChatPanel = ({ editor, onLoad }: SidebarTabProps) => {
   const chatPanelRef = useRef<ChatPanel | null>(null);
 
   const onRefChange = useCallback((container: HTMLDivElement | null) => {
@@ -17,6 +17,16 @@ const EditorChatPanel = ({ editor }: SidebarTabProps) => {
     }
   }, []);
 
+  useEffect(() => {
+    if (onLoad && chatPanelRef.current) {
+      (chatPanelRef.current as ChatPanel).updateComplete
+        .then(() => {
+          onLoad(chatPanelRef.current as HTMLElement);
+        })
+        .catch(console.error);
+    }
+  }, [onLoad]);
+
   useEffect(() => {
     if (!editor) return;
     const pageService = editor.host.spec.getService('affine:page');