finalizing app adn fixes

frontend/src/components/common/PageHeader.tsx

@@ -13,6 +13,7 @@ import { WorkflowInsights, WorkflowInsight } from './WorkflowInsights';
 
 interface PageHeaderProps {
   title: string;
+  description?: string; // Optional page description shown below title
   lastUpdated?: Date;
   showRefresh?: boolean;
   onRefresh?: () => void;
@@ -28,6 +29,7 @@ interface PageHeaderProps {
 
 export default function PageHeader({
   title,
+  description,
   lastUpdated,
   showRefresh = false,
   onRefresh,
@@ -116,6 +118,9 @@ export default function PageHeader({
             )}
             <h2 className="text-2xl font-bold text-gray-800 dark:text-white/90">{title}</h2>
           </div>
+          {description && (
+            <p className="text-sm text-gray-500 dark:text-gray-400 mt-1 max-w-xl">{description}</p>
+          )}
           {!hideSiteSector && (
             <div className="flex items-center gap-3 mt-1">
               {lastUpdated && (