Fix theme installation and activation with AJAX-based approach

admin/partials/theme-panel.php

@@ -39,19 +39,13 @@ if (!defined('ABSPATH')) {
                     <?php esc_html_e('Activate'); ?>
                 </a>
             <?php else: ?>
-                <?php 
-                // Use the standard WordPress theme installation URL format
-                $install_url = wp_nonce_url(
-                    admin_url('update.php?action=install-theme&theme=kadence'),
-                    'install-theme_kadence'
-                );
-                ?>
-                <a href="<?php echo esc_url($install_url); ?>" 
+                <button type="button" 
                    class="button button-primary install-now" 
                    data-slug="kadence" 
-                   data-name="Kadence">
+                   data-name="Kadence"
+                   aria-label="<?php esc_attr_e('Install Kadence'); ?>">
                     <?php esc_html_e('Install'); ?>
-                </a>
+                </button>
             <?php endif; ?>
             <script>
             jQuery(document).ready(function($) {