Update route check and add PageBody wrapper

Updated the `isRouteActive` check in the sidebar component to ensure it doesn't falsely identify nested routes as active. Additionally, introduced a `PageBody` wrapper in the account page component for consistent styling and padding.

packages/ui/src/makerkit/sidebar.tsx

@@ -159,7 +159,7 @@ export function SidebarItem({
   const { collapsed } = useContext(SidebarContext);
   const currentPath = usePathname() ?? '';
 
-  const active = isRouteActive(path, currentPath, end);
+  const active = isRouteActive(path, currentPath, end ?? false);
   const variant = active ? 'secondary' : 'ghost';
   const size = collapsed ? 'icon' : 'sm';
 
@@ -254,4 +254,4 @@ export function SidebarNavigation({
       })}
     </>
   );
-}
+}