MediaWiki:Common.css

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# Replace the JAVASCRIPT_CODE section with this updated version:

/* Collapsible Sidebar Functionality */
$(document).ready(function() {
    function initCollapsibleSidebar() {
        var collapsibleSections = [
            'Documentation', 
            'Tools & Utilities', 
            'Community', 
            'Administrative', 
            'External Resources'
        ];

        var startCollapsed = ['Administrative', 'External Resources'];

        $('#mw-panel .portal').each(function() {
            var $portal = $(this);
            var $header = $portal.find('h3');
            var $body = $portal.find('.body');
            var headerText = $header.text().trim();

            var portalId = $portal.attr('id');
            if (portalId === 'p-search' || portalId === 'p-tb' || portalId === 'p-lang') {
                return;
            }

            if (collapsibleSections.includes(headerText)) {
                $header.find('.sidebar-toggle').remove();

                var isCollapsed = startCollapsed.includes(headerText);
                var toggleText = isCollapsed ? 'book1' : 'bookend';
                var $toggleBtn = $('<span class="sidebar-toggle">' + toggleText + '</span>');

                $header.append(' ').append($toggleBtn);

                if (isCollapsed) {
                    $body.hide();
                    $portal.addClass('sidebar-collapsed');
                }

                $toggleBtn.off('click').on('click', function(e) {
                    e.preventDefault();
                    e.stopPropagation();

                    if ($body.is(':visible')) {
                        $body.slideUp(300);
                        $toggleBtn.text('book1');
                        $portal.addClass('sidebar-collapsed');
                        localStorage.setItem('sidebar-' + headerText, 'collapsed');
                    } else {
                        $body.slideDown(300);
                        $toggleBtn.text('bookend');
                        $portal.removeClass('sidebar-collapsed');
                        localStorage.setItem('sidebar-' + headerText, 'expanded');
                    }
                });

                var savedState = localStorage.getItem('sidebar-' + headerText);
                if (savedState === 'collapsed' && $body.is(':visible')) {
                    $body.hide();
                    $toggleBtn.text('book1');
                    $portal.addClass('sidebar-collapsed');
                } else if (savedState === 'expanded' && !$body.is(':visible')) {
                    $body.show();
                    $toggleBtn.text('bookend');
                    $portal.removeClass('sidebar-collapsed');
                }
            }
        });
    }

    initCollapsibleSidebar();

    $(document).ajaxComplete(function() {
        setTimeout(initCollapsibleSidebar, 100);
    });
});