Fix options chain headers mixing list and T-view columns.

Thead rows used a .hidden class with no CSS rule on instance pages, so both header sets stayed visible.

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

lib/common/static/instance_theme.css

@@ -3084,6 +3084,10 @@ html[data-theme="light"] .settings-side-export-label {
   z-index: 1;
   background: rgba(18, 24, 38, 0.98);
 }
+/* 列表 / T 型表头互斥:类名 hidden 需显式隐藏(实例页无全局 .hidden) */
+.options-strike-table thead tr.hidden {
+  display: none !important;
+}
 .options-strike-table {
   width: 100%;
   border-collapse: collapse;