final polish phase 1

frontend/src/context/PageContext.tsx

@@ -1,6 +1,7 @@
 /**
  * Page Context - Shares current page info with header
  * Allows pages to set title, parent module, badge for display in AppHeader
+ * Dashboard mode: enables "All Sites" option in site selector
  */
 import React, { createContext, useContext, useState, ReactNode } from 'react';
 
@@ -11,6 +12,15 @@ interface PageInfo {
     icon: ReactNode;
     color: 'blue' | 'green' | 'purple' | 'orange' | 'red' | 'indigo' | 'yellow' | 'pink' | 'emerald' | 'cyan' | 'amber' | 'teal';
   };
+  /** Completely hide site/sector selectors in app header */
+  hideSelectors?: boolean;
+  hideSectorSelector?: boolean; // Hide sector selector in app header (for dashboard)
+  /** Dashboard mode: show "All Sites" option in site selector */
+  showAllSitesOption?: boolean;
+  /** Current site filter for dashboard mode ('all' or site id) */
+  siteFilter?: 'all' | number;
+  /** Callback when site filter changes in dashboard mode */
+  onSiteFilterChange?: (value: 'all' | number) => void;
 }
 
 interface PageContextType {