From aa8526edc0331248e0273875c517865a6732e454 Mon Sep 17 00:00:00 2001
From: zhiqing0205 <1775840762@qq.com>
Date: Tue, 6 Jan 2026 10:24:02 +0800
Subject: [PATCH] fix(codex): use unicode title casing for plan

---
 internal/auth/codex/filename.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/internal/auth/codex/filename.go b/internal/auth/codex/filename.go
index 7eeedce6..fcf02802 100644
--- a/internal/auth/codex/filename.go
+++ b/internal/auth/codex/filename.go
@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"strings"
 	"unicode"
+
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 // CredentialFileName returns the filename used to persist Codex OAuth credentials.
@@ -48,8 +51,5 @@ func titleToken(token string) string {
 	if token == "" {
 		return ""
 	}
-	lower := strings.ToLower(token)
-	runes := []rune(lower)
-	runes[0] = unicode.ToUpper(runes[0])
-	return string(runes)
+	return cases.Title(language.English).String(token)
 }