Improve navigation and usability for long lists

Some lists can become quite long. It could be useful to add a few features to improve navigation and overall usability:

• A button to quickly scroll back to the top of the page

• A fixed filter panel. Currently, when the filter panel is enabled, it leaves a large empty space on the left side of the page while scrolling

• A fixed search bar as well, so users can quickly access the search field or the "Selected" button without having to scroll back to the top of the page