fn load_explore_landing(ui: Rc<LibraryWindowUi>)Expand description
Load smart/metadata sections onto the Explore dashboard view.
Switches to the Explore stack child immediately so the user sees the section headers + per-section spinners while data is in flight. Each of the three fetches runs as an independent task, so a slow endpoint never blocks the others — first contentful paint happens as soon as the fastest section returns.