Function toggle_app_storage 

pub fn toggle_app_storage(label: &str, stored: &StoredView<bool>) -> ViewHandle

Toggle(label, isOn: $flag) — a toggle driven directly by a real @AppStorage.

No Rust state sits in between: the binding is the one the property wrapper projects, so flipping the toggle writes through UserDefaults and re-runs the owning view’s body. toggle_bound is the counterpart for state Rust owns.