From c96720d6c09778362e4cfbcae465253aeff84542 Mon Sep 17 00:00:00 2001
From: Yusuke Nakamura <yusuke1994525@gmail.com>
Date: Fri, 24 Apr 2026 10:21:13 +0900
Subject: [PATCH] ChatMessageView: tag Japanese messages with lang="ja"

Detect Japanese script (Hiragana/Katakana/Han) in Discord chat
content and add a lang attribute so browsers can apply Japanese
font fallbacks and hyphenation rules.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 ui/src/ChatMessageView.tsx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ui/src/ChatMessageView.tsx b/ui/src/ChatMessageView.tsx
index 1df027a..cb7ec3f 100644
--- a/ui/src/ChatMessageView.tsx
+++ b/ui/src/ChatMessageView.tsx
@@ -132,6 +132,11 @@ const ChatAuthorName: React.FC<{ author: ChatSender; fg: string }> = ({
   );
 };
 
+const JAPANESE_PATTERN = /\p{Script=Hiragana}|\p{Script=Katakana}|\p{Script=Han}/u;
+
 const ChatMessageText: React.FC<{ content: string }> = ({ content }) => {
+  if (JAPANESE_PATTERN.test(content)) {
+    return <span lang="ja">{content}</span>;
+  }
   return <span>{content}</span>;
 };