/**
     * Reconciliation: Scan all categories/pages, queue missing products for creation.
     */
    public static function reconcile_missing_products() {
        if ( ! current_user_can( 'manage_woocommerce' ) ) {
            return new WP_Error( 'unauthorized', 'Unauthorized' );
        }
        $settings = self::settings();
        $all_cats = get_transient( 'imlss_all_categories' );
        if ( ! $all_cats || !is_array($all_cats) || count($all_cats) === 0 ) {
            // Fallback: use currently selected categories from scheduler state
            $sched_state = get_option( self::SCHED_STATE_KEY, [] );
            $all_cats = $sched_state['cats'] ?? [];
        }
        $missing_queue = [];
        foreach ( $all_cats as $cat ) {
            $cat_path = trim( (string) ( $cat['path'] ?? ( $cat['id'] ?? '' ) ), '/' );
            $category_url_base = 'https://shop.imlss.com/item_view/shop/' . $cat_path . '/all?_l=120&_k=true&_of=__store&_ipp=50&_ist=2';
            // Detect last page
            $settings['catalog_url'] = add_query_arg( 'item_page', 1, $category_url_base );
            $settings['catalog_start_page'] = 1;
            $settings['catalog_page_param'] = 'item_page';
            $settings['import_batch_size'] = 50;
            $settings['enrich_on_import'] = 0;
            $scrape_first = self::do_login_and_scrape( $settings, 1 );
            $last_page = 1;
            if ( ! empty( $scrape_first['summary']['ok'] ) && ! empty( $scrape_first['summary']['pages_fetched'][0]['rows'] ) ) {
                if ( preg_match( '/([0-9,]+)\s+Items/i', $scrape_first['summary']['message'] ?? '', $m ) ) {
                    $total_products = (int) str_replace( ',', '', $m[1] );
                    $last_page = max( 1, ceil( $total_products / 50 ) );
                }
            }
            for ( $page = 1; $page <= $last_page; $page++ ) {
                $settings['catalog_url'] = add_query_arg( 'item_page', $page, $category_url_base );
                $settings['catalog_start_page'] = $page;
                $scrape = self::do_login_and_scrape( $settings, 50 );
                if ( empty( $scrape['summary']['ok'] ) ) continue;
                foreach ( $scrape['samples'] as $row ) {
                    $sku = trim( (string) ( $row['sku'] ?? '' ) );
                    if ( $sku === '' ) continue;
                    $existing_id = (int) wc_get_product_id_by_sku( $sku );
                    if ( $existing_id <= 0 ) {
                        $row['url_base'] = $settings['catalog_url'];
                        $missing_queue[] = $row;
                    }
                }
            }
        }
        set_transient( 'imlss_reconcile_queue', $missing_queue, 12 * HOUR_IN_SECONDS );
        return [ 'count' => count( $missing_queue ) ];
    }

    // AJAX handler for reconciliation
    public static function ajax_reconcile_missing_products() {
        check_ajax_referer( 'imlss_reconcile' );
        $result = self::reconcile_missing_products();
        if ( is_wp_error( $result ) ) {
            wp_send_json_error( $result->get_error_message() );
        } else {
            wp_send_json_success( $result );
        }
    }
    add_action( 'wp_ajax_imlss_reconcile_missing_products', [ __CLASS__, 'ajax_reconcile_missing_products' ] );
                <hr />
                <h2>Reconciliation: Find All Missing Products</h2>
                <p>Scan all supplier categories/pages and build a queue of products not yet created in WooCommerce.</p>
                <button type="button" id="imlss-reconcile-btn" class="button button-primary">Scan &amp; Build Missing Product Queue</button>
                <span id="imlss-reconcile-status" style="margin-left:10px;color:#0073aa;"></span>
                <script>
                jQuery(function($){
                    $('#imlss-reconcile-btn').on('click', function(){
                        var $btn = $(this), $status = $('#imlss-reconcile-status');
                        $btn.prop('disabled', true);
                        $status.text('Scanning...');
                        $.post(ajaxurl, { action: 'imlss_reconcile_missing_products', nonce: