pub async fn OnTreeViewExpansionChanged(
_ApplicationHandle: AppHandle<Wry>,
_State: State<'_, Arc<ApplicationState>>,
_ViewId: String,
_ElementHandle: String,
_IsExpanded: bool,
) -> Result<Value, String>Expand description
Handles tree node expansion/collapse events.
TODO: Implement OnTreeNodeExpanded method in the TreeViewProvider trait. This method notifies the provider when a node is expanded or collapsed, allowing it to lazily load child items or preserve expansion state. Currently returns an error indicating the method is not implemented.