<header id="main-app-header" class="sticky top-0 z-20">
    <button id="mobile-menu-button">
        <i data-lucide="menu"></i>
    </button>
    <div class="page-header-container">
        <h2 id="page-title"></h2>
        <p id="page-subtitle"></p>
    </div>
</header>