GroupedMarketTable 单选时区时隐藏分组标题行

groups.length === 1 时直接展示扁平表格，多时区（ALL）时保留可折叠分组。

frontend/components/dashboard/scan-terminal/GroupedMarketTable.tsx

@@ -47,6 +47,7 @@ export function GroupedMarketTable({
 
   const labelActive = isEn ? "Active" : "活跃";
   const labelWatch = isEn ? "Watch" : "观察";
+  const showHeaders = groups.length > 1;
 
   return (
     <div className="overflow-auto h-full">
@@ -65,12 +66,12 @@ export function GroupedMarketTable({
           </tr>
         </thead>
         <tbody>
-          {groups.map((group) => {
+          {groups.flatMap((group) => {
             const isExpanded = !collapsed.has(group.key);
-            const label = isEn ? group.labelEn : group.labelZh;
+            const rows = showHeaders && !isExpanded ? [] : group.rows;
             return (
               <Fragment key={group.key}>
-                {/* Group header row */}
+                {showHeaders && (
                   <tr className="border-b border-slate-200 bg-[#eef2f6]">
                     <td colSpan={9} className="p-0">
                       <button
@@ -82,7 +83,7 @@ export function GroupedMarketTable({
                           {isExpanded ? <ChevronDown size={12} /> : <ChevronRight size={12} />}
                         </span>
                         <span className="text-[11px] font-black uppercase tracking-wide text-slate-600">
-                        {label}
+                          {isEn ? group.labelEn : group.labelZh}
                         </span>
                         <span className="text-[10px] text-slate-400">
                           {group.rows.length} · {labelActive} {group.activeCount} · {labelWatch} {group.watchCount}
@@ -92,9 +93,8 @@ export function GroupedMarketTable({
                       </button>
                     </td>
                   </tr>
-                {/* Data rows */}
+                )}
-                {isExpanded &&
+                {rows.map((row) => {
-                  group.rows.map((row) => {
                     const signal = getSignalState(row);
                     const gapColor = GAP_COLOR_MAP[getGapColor(row)];
                     return (