feat(大屏绘制): 战情大屏隐藏顶部标题区，只保留导航 Tab

DashboardApp 顶部 Header(标题+副标题+生成时间)在 usingPages 模式下整块隐藏，
dashboard-agent 战情大屏直接从导航 Tab 起；会商 Step3 大屏行为不变。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/.env.development

@@ -5,7 +5,7 @@
 VITE_USE_REAL_DATA=true
 
 # 任务详情（登录深链 cop-task-detail）数据源：默认真实接口；改成 true 走本地假数据（consumer 外网不可达时调试用）。
-VITE_MOCK_COP_TASK_DETAIL=true
+VITE_MOCK_COP_TASK_DETAIL=flase
 
 # 研判情报报告（大屏绘制智能体深链 selectSqReport）数据源：true 走本地样例假数据（真实接口未就绪时调试用）；联调通过后置 false。
 VITE_MOCK_SQ_REPORT=true

frontend-web/src/roundtable-planning/dashboard/DashboardApp.tsx

@@ -86,31 +86,31 @@ export function DashboardApp({
         <div className="h-1 bg-gradient-to-r from-rose-600 via-amber-500 to-sky-600 dark:from-[var(--dash-primary)] dark:via-[var(--dash-accent)] dark:to-[#4096ff] w-full" />
 
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 pt-5 space-y-6">
-          {/* Header */}
-          <header className="flex flex-col lg:flex-row lg:items-center justify-between gap-4 pb-4 border-b border-rose-100 dark:border-[var(--dash-border)]">
-            <div className="space-y-1">
-              <div className="flex flex-wrap items-center gap-3">
-                <h1 className="text-xl sm:text-2xl font-black tracking-tight font-display flex items-center gap-1.5 text-rose-900 dark:text-[var(--dash-text-strong)]">
-                  {data.meta.title}
-                </h1>
+          {/* Header（标题 + 副标题 + 生成时间）。战情多页（dashboard-agent 战情大屏）隐藏整块标题区，
+              只保留下方导航 Tab；会商 Step3 大屏照常展示。 */}
+          {!usingPages && (
+            <header className="flex flex-col lg:flex-row lg:items-center justify-between gap-4 pb-4 border-b border-rose-100 dark:border-[var(--dash-border)]">
+              <div className="space-y-1">
+                <div className="flex flex-wrap items-center gap-3">
+                  <h1 className="text-xl sm:text-2xl font-black tracking-tight font-display flex items-center gap-1.5 text-rose-900 dark:text-[var(--dash-text-strong)]">
+                    {data.meta.title}
+                  </h1>
+                </div>
+                {data.meta.subtitle && (
+                  <p className="text-xs sm:text-sm text-slate-500 dark:text-[var(--dash-text-sec)] font-sans tracking-wide">
+                    {data.meta.subtitle}
+                  </p>
+                )}
               </div>
-              {data.meta.subtitle && (
-                <p className="text-xs sm:text-sm text-slate-500 dark:text-[var(--dash-text-sec)] font-sans tracking-wide">
-                  {data.meta.subtitle}
-                </p>
-              )}
-            </div>
 
-            {/* 战情多页（dashboard-agent）不展示「生成于」时间标签；会商 Step3 大屏保留。 */}
-            {!usingPages && (
               <div className="flex flex-wrap items-center gap-2.5 self-start lg:self-center text-xs text-slate-500 dark:text-[var(--dash-text-sec)]">
                 <div className="flex items-center gap-1.5 font-mono px-3 py-1.5 bg-white dark:bg-[var(--dash-card)] border border-slate-200 dark:border-[var(--dash-border)] shadow-sm rounded-sm">
                   <Clock className="w-3.5 h-3.5 text-rose-600 dark:text-[var(--dash-primary)] animate-pulse" />
                   <span>生成于 {data.meta.generatedAt}</span>
                 </div>
               </div>
-            )}
-          </header>
+            </header>
+          )}
 
           {/* 导航 Tab */}
           <nav className="flex items-center justify-start overflow-x-auto pb-1 -mx-4 px-4 sm:mx-0 sm:px-0">