class CustomSidebar extends HTMLElement { connectedCallback() { this.attachShadow({ mode: 'open' }); this.shadowRoot.innerHTML = ` `; // Initialize feather icons in shadow DOM const featherScript = document.createElement('script'); featherScript.src = 'https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js'; this.shadowRoot.appendChild(featherScript); featherScript.onload = () => feather.replace(); } } customElements.define('custom-sidebar', CustomSidebar);