feat(core): support collection search for ai chat (#10987)

Close [BS-2787](https://linear.app/affine-design/issue/BS-2787).
Close [BS-2788](https://linear.app/affine-design/issue/BS-2788).

![截屏2025-03-19 14.15.54.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/sJGviKxfE3Ap685cl5bj/573450f9-791b-4cd9-9c75-df93bf9966b4.png)

packages/frontend/core/src/blocksuite/ai/chat-panel/chat-config.ts

@@ -1,4 +1,5 @@
 import type {
+  SearchCollectionMenuAction,
   SearchDocMenuAction,
   SearchTagMenuAction,
 } from '@affine/core/modules/search-menu/services';
@@ -43,4 +44,9 @@ export interface SearchMenuConfig {
     action: SearchTagMenuAction,
     abortSignal: AbortSignal
   ) => LinkedMenuGroup;
+  getCollectionMenuGroup: (
+    query: string,
+    action: SearchCollectionMenuAction,
+    abortSignal: AbortSignal
+  ) => LinkedMenuGroup;
 }

packages/frontend/core/src/blocksuite/ai/chat-panel/components/add-popover.ts

@@ -1,5 +1,8 @@
 import { toast } from '@affine/component';
-import type { TagMeta } from '@affine/core/components/page-list';
+import type {
+  CollectionMeta,
+  TagMeta,
+} from '@affine/core/components/page-list';
 import { ShadowlessElement } from '@blocksuite/affine/block-std';
 import { SignalWatcher, WithDisposable } from '@blocksuite/affine/global/lit';
 import { scrollbarStyle } from '@blocksuite/affine/shared/styles';
@@ -314,6 +317,13 @@ export class ChatPanelAddPopover extends SignalWatcher(
           this.abortController.signal
         );
         break;
+      case AddPopoverMode.Collections:
+        this._searchGroup = this.searchMenuConfig.getCollectionMenuGroup(
+          this._query,
+          this._addCollectionChip,
+          this.abortController.signal
+        );
+        break;
       default:
         this._searchGroup = this.searchMenuConfig.getDocMenuGroup(
           this._query,
@@ -335,6 +345,10 @@ export class ChatPanelAddPopover extends SignalWatcher(
     this.abortController.abort();
   };
 
+  private readonly _addCollectionChip = (_collection: CollectionMeta) => {
+    this.abortController.abort();
+  };
+
   private readonly _handleKeyDown = (event: KeyboardEvent) => {
     if (event.isComposing) return;