// ============================================================================
// Class
// ============================================================================

// /**
//  * @title Loader
//  * @description Manages the loading indicator for graph visualizations.
//  *
//  * This class is responsible for showing and hiding a loading indicator
//  * within a specified container element. It is used to provide visual
//  * feedback to the user while graph data is being loaded and processed.
//  */
// export class Loader {
//     // Properties
//     // ========================================================================

//     private container_id: string
//     private element: HTMLElement | null

//     // Constructor
//     // ========================================================================

//     /**
//      * Constructs a Loader instance for a specific container.
//      * @param container_id The ID of the HTML element where the loader will
//      * be shown.
//      */
//     constructor(container_id: string) {
//         this.container_id = container_id
//         this.element = null
//         this.init()
//     }

//     // Methods
//     // ========================================================================

//     /**
//      * Initializes the loader element and appends it to the container.
//      * The loader is initially hidden.
//      */
//     private init(): void {
//         const container = document.getElementById(this.container_id)
//         if (!container) {
//             console.error(`Container with ID "${this.container_id}" not found.`)
//             return
//         }

//         this.element = document.createElement('div')
//         this.element.className = 'graph_loader'
//         this.element.setAttribute('role', 'status')
//         this.element.setAttribute('aria-live', 'assertive')
//         this.element.style.display = 'none' // Initially hidden
//         container.appendChild(this.element)
//     }

//     /**
//      * Shows the loading indicator in the container.
//      * If a loading element already exists, it does nothing.
//      * Otherwise, it creates a new loading element and appends it to the
//      * container.
//      */
//     public show(): void {
//         if (this.element) {
//             this.element.style.display = 'block' // Make visible
//         }
//     }

//     /**
//      * Hides and removes the loading indicator from the container.
//      * If a loading element exists, it is removed from the DOM.
//      */
//     public hide(): void {
//         if (this.element) {
//             this.element.style.display = 'none' // Hide
//         }
//     }
// }