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

src/pages/DashboardPage.tsx

@@ -10,11 +10,6 @@ export function DashboardPage() {
 
   return (
     <div className="space-y-6">
-      <div>
-        <h1 className="text-3xl font-bold">Dashboard</h1>
-        <p className="text-muted-foreground">Welcome back, {user.name}!</p>
-      </div>
-
       <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
         {/* User Profile Card */}
         <Card>