feat: enhance layout and sidebar functionality with new PageHeader and SidebarContext

src/pages/ActivityPage.tsx

@@ -3,11 +3,6 @@ import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/com
 export function ActivityPage() {
   return (
     <div className="space-y-6">
-      <div>
-        <h1 className="text-3xl font-bold">Activity</h1>
-        <p className="text-muted-foreground">View recent activity and logs</p>
-      </div>
-
       <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
         <Card>
           <CardHeader>