Timeline can be empty if it contains only favs / follows

If you have mostly reactions like favs and follows in your timeline, it will be rather empty (sometimes even completely emtpy) when fetching for the first time. This is because non-posts don't display, but are used for updates of like count and so on.

To solve this, the first frontend fetch by the FE should be done with a parameter that signals to the backend to return only posts, not likes / favs.