refactor: tighten OAuth Auth Center copy, layout, and icon

- Trim Auth Center section descriptions to focus on user intent
- Remove duplicate outer heading on the auth settings tab
- Swap Sparkles glyph for CodexIcon on the ChatGPT card
- Generalize codexOauth.authStatus to a neutral "Auth status"
- Register settings.authCenter.* keys across zh/en/ja locales

src/i18n/locales/en.json

@@ -225,6 +225,13 @@
     "tabGeneral": "General",
     "tabAdvanced": "Advanced",
     "tabProxy": "Proxy",
+    "authCenter": {
+      "title": "OAuth Authentication Center",
+      "description": "Use your other subscriptions in Claude Code — please be mindful of compliance risks.",
+      "beta": "Beta",
+      "copilotDescription": "Manage GitHub Copilot accounts",
+      "codexOauthDescription": "Manage ChatGPT accounts"
+    },
     "advanced": {
       "configDir": {
         "title": "Configuration Directory",
@@ -846,7 +853,7 @@
     "loadModelsFailed": "Failed to load Copilot models"
   },
   "codexOauth": {
-    "authStatus": "ChatGPT Plus/Pro Auth",
+    "authStatus": "Auth status",
     "notAuthenticated": "Not authenticated",
     "loginWithChatGPT": "Sign in with ChatGPT",
     "loginRequired": "Please sign in to ChatGPT first",

src/i18n/locales/ja.json

@@ -225,6 +225,13 @@
     "tabGeneral": "一般",
     "tabAdvanced": "詳細",
     "tabProxy": "プロキシ",
+    "authCenter": {
+      "title": "OAuth 認証センター",
+      "description": "Claude Code で他のサブスクリプションをご利用いただけます。コンプライアンスリスクにご注意ください。",
+      "beta": "Beta",
+      "copilotDescription": "GitHub Copilot アカウントを管理します",
+      "codexOauthDescription": "ChatGPT アカウントを管理します"
+    },
     "advanced": {
       "configDir": {
         "title": "設定ディレクトリ",
@@ -846,7 +853,7 @@
     "loadModelsFailed": "Copilot モデル一覧の読み込みに失敗しました"
   },
   "codexOauth": {
-    "authStatus": "ChatGPT Plus/Pro 認証",
+    "authStatus": "認証状態",
     "notAuthenticated": "未認証",
     "loginWithChatGPT": "ChatGPT でログイン",
     "loginRequired": "先に ChatGPT にログインしてください",

src/i18n/locales/zh.json

@@ -225,6 +225,13 @@
     "tabGeneral": "通用",
     "tabAdvanced": "高级",
     "tabProxy": "代理",
+    "authCenter": {
+      "title": "OAuth 认证中心",
+      "description": "在 Claude Code 中使用您的其他订阅，请注意合规风险。",
+      "beta": "Beta",
+      "copilotDescription": "管理 GitHub Copilot 账号",
+      "codexOauthDescription": "管理 ChatGPT 账号"
+    },
     "advanced": {
       "configDir": {
         "title": "配置文件目录",
@@ -846,7 +853,7 @@
     "loadModelsFailed": "加载 Copilot 模型列表失败"
   },
   "codexOauth": {
-    "authStatus": "ChatGPT Plus/Pro 认证",
+    "authStatus": "认证状态",
     "notAuthenticated": "未认证",
     "loginWithChatGPT": "使用 ChatGPT 登录",
     "loginRequired": "请先登录 ChatGPT 账号",