From de866d617b3a19d84bb6f9233e9f35c4c1fe1085 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=A5=BF=E6=9D=91=E6=8B=93=E6=9C=97=E3=81=AE=E3=82=A2?=
 =?UTF-8?q?=E3=83=97=E3=83=AA?= <nishimuratakuro@luft-hd.co.jp>
Date: Mon, 23 Feb 2026 13:59:40 +0900
Subject: [PATCH] fix(markdown): handle mailto: links without target="_blank"
 to allow email client to open

## Summary

When mailto: links are rendered in chat responses, clicking them does not open the email client because the Link component adds target="_blank" to all valid URLs including mailto: links.

With target="_blank", browsers attempt to open a new tab for mailto: links, which results in a blank tab or nothing happening instead of launching the default email client.

## Changes

Added a check for mailto: links before the default target="_blank" rendering. mailto: links are now rendered as plain <a> tags without target="_blank", allowing the browser to properly handle the mailto: protocol and open the user's default email client.

Related: #12954 #16243
---
 web/app/components/base/markdown-blocks/link.tsx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/web/app/components/base/markdown-blocks/link.tsx b/web/app/components/base/markdown-blocks/link.tsx
index 717352609fe..ae92392aa2e 100644
--- a/web/app/components/base/markdown-blocks/link.tsx
+++ b/web/app/components/base/markdown-blocks/link.tsx
@@ -36,6 +36,10 @@ const Link = ({ node, children, ...props }: any) => {
     if (!href || !isValidUrl(href))
       return <span>{children}</span>
 
+    // Handle mailto: links without target="_blank" to allow email client to open directly
+    if (href.toString().startsWith('mailto:'))
+      return <a href={href} className={commonClassName}>{children}</a>
+
     return <a href={href} target="_blank" rel="noopener noreferrer" className={commonClassName}>{children || 'Download'}</a>
   }
 }