feat: added report download button (#78)

web/src/app/chat/components/research-block.tsx

@@ -1,7 +1,7 @@
 // Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 // SPDX-License-Identifier: MIT
 
-import { Check, Copy, Headphones, Pencil, Undo2, X } from "lucide-react";
+import { Check, Copy, Headphones, Pencil, Undo2, X, Download } from "lucide-react";
 import { useCallback, useEffect, useState } from "react";
 
 import { ScrollContainer } from "~/components/deer-flow/scroll-container";
@@ -64,6 +64,33 @@ export function ResearchBlock({
     }, 1000);
   }, [reportId]);
 
+  // Download report as markdown
+  const handleDownload = useCallback(() => {
+    if (!reportId) {
+      return;
+    }
+    const report = useStore.getState().messages.get(reportId);
+    if (!report) {
+      return;
+    }
+    const now = new Date();
+    const pad = (n: number) => n.toString().padStart(2, '0');
+    const timestamp = `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}_${pad(now.getHours())}-${pad(now.getMinutes())}-${pad(now.getSeconds())}`;
+    const filename = `research-report-${timestamp}.md`;
+    const blob = new Blob([report.content], { type: 'text/markdown' });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    setTimeout(() => {
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+    }, 0);
+  }, [reportId]);
+
+    
   const handleEdit = useCallback(() => {
     setEditing((editing) => !editing);
   }, []);
@@ -113,6 +140,16 @@ export function ResearchBlock({
                   {copied ? <Check /> : <Copy />}
                 </Button>
               </Tooltip>
+              <Tooltip title="Download report as markdown">
+                <Button
+                  className="text-gray-400"
+                  size="icon"
+                  variant="ghost"
+                  onClick={handleDownload}
+                >
+                  <Download />
+                </Button>
+              </Tooltip>
             </>
           )}
           <Tooltip title="Close">