feat: support basic file presenting

frontend/src/components/workspace/message-list/message-list.tsx

@@ -4,7 +4,12 @@ import {
   Conversation,
   ConversationContent,
 } from "@/components/ai-elements/conversation";
-import { groupMessages, hasContent } from "@/core/messages/utils";
+import {
+  extractPresentFilesFromMessage,
+  groupMessages,
+  hasContent,
+  hasPresentFiles,
+} from "@/core/messages/utils";
 import type { AgentThreadState } from "@/core/threads";
 import { cn } from "@/lib/utils";
 
@@ -12,6 +17,7 @@ import { StreamingIndicator } from "../streaming-indicator";
 
 import { MessageGroup } from "./message-group";
 import { MessageListItem } from "./message-list-item";
+import { PresentFileList } from "./present-file-list";
 import { MessageListSkeleton } from "./skeleton";
 
 export function MessageList({
@@ -43,6 +49,17 @@ export function MessageList({
                 />
               );
             }
+            if (groupedMessages[0] && hasPresentFiles(groupedMessages[0])) {
+              const files = [];
+              for (const message of groupedMessages) {
+                if (hasPresentFiles(message)) {
+                  files.push(...extractPresentFilesFromMessage(message));
+                }
+              }
+              return (
+                <PresentFileList key={groupedMessages[0].id} files={files} />
+              );
+            }
             return (
               <MessageGroup
                 key={groupedMessages[0]!.id}

frontend/src/components/workspace/message-list/present-file-list.tsx

@@ -0,0 +1,32 @@
+import { DownloadIcon } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import {
+  Card,
+  CardAction,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "@/components/ui/card";
+import { getFileExtension, getFileName } from "@/core/utils/files";
+
+export function PresentFileList({ files }: { files: string[] }) {
+  return (
+    <ul className="w-full">
+      {files.map((file) => (
+        <Card key={file}>
+          <CardHeader>
+            <CardTitle>{getFileName(file)}</CardTitle>
+            <CardDescription>{getFileExtension(file)} file</CardDescription>
+            <CardAction>
+              <Button variant="ghost">
+                <DownloadIcon className="size-4" />
+                Download
+              </Button>
+            </CardAction>
+          </CardHeader>
+        </Card>
+      ))}
+    </ul>
+  );
+}