总览改为列表布局，工作台全宽显示内嵌客户端。

避免主栏 max-width 挤压 iframe，并延长 SSO 打开链有效期。

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/base.html

@@ -6,7 +6,7 @@
   <title>{% block title %}期权中控{% endblock %}</title>
   <link rel="stylesheet" href="{{ url_for('static', filename='hub.css') }}">
 </head>
-<body>
+<body class="{% if request.path.startswith('/desk') %}page-desk{% elif request.path == '/' %}page-dashboard{% endif %}">
   {% if session.get('logged_in') %}
   <header class="topbar">
     <div class="brand">crypto_okx_hub</div>

templates/dashboard.html

@@ -6,7 +6,7 @@
   <button type="button" class="btn" id="btn-refresh">刷新</button>
 </section>
 <p class="muted" id="overview-status">加载中…</p>
-<div id="overview-grid" class="card-grid"></div>
+<div id="overview-grid"></div>
 {% endblock %}
 {% block scripts %}
 <script src="{{ url_for('static', filename='hub.js') }}"></script>