Fix: Added the ability to download files in the agent message reply function. (#11281)

### What problem does this PR solve?

Fix: Added the ability to download files in the agent message reply
function.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/interfaces/database/chat.ts

@@ -1,4 +1,5 @@
 import { MessageType } from '@/constants/chat';
+import { IAttachment } from '@/hooks/use-send-message';
 
 export interface PromptConfig {
   empty_response: string;
@@ -97,6 +98,7 @@ export interface Message {
   data?: any;
   files?: File[];
   chatBoxId?: string;
+  attachment?: IAttachment;
 }
 
 export interface IReferenceChunk {
@@ -126,6 +128,7 @@ export interface IReferenceObject {
 
 export interface IAnswer {
   answer: string;
+  attachment?: IAttachment;
   reference?: IReference;
   conversationId?: string;
   prompt?: string;