meta: set lang=ja for Japanese font rendering

aster-void · claude · aster-void · commit d49d214152cf · 2025-12-23T17:39:57.000+09:00
🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
diff --git a/src/app.html b/src/app.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="en" data-theme="light">
+<html lang="ja" data-theme="light">
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
