Use when adding a splashscreen to a Tauri v2 app — declaring a visible splash window and a hidden main window in config, doing initialization work in the Rust `setup` hook with `tokio::spawn` (never `std::thread::sleep`), signaling readiness via a `splash://ready` event or directly via `get_webview_window("splash").close()` + main `.show()`, and choosing JS-driven vs pure-Rust orchestration.
