fix(core): prevent input event propagation (#11307)

### TL;DR

Prevent input event of search propagate to editor

> CLOSE BS-2832

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

@@ -360,11 +360,13 @@ export class ChatPanelAddPopover extends SignalWatcher(
   }
 
   private _onCompositionEnd(event: CompositionEvent) {
+    event.stopPropagation();
     this._updateQuery((event.target as HTMLInputElement).value.trim());
   }
 
   private _onInput(event: InputEvent) {
     if (event.isComposing) return;
+    event.stopPropagation();
     this._updateQuery((event.target as HTMLInputElement).value.trim());
   }