Update dashboard JS and frontend class

includes/class-hssm-main.php

@@ -173,9 +173,7 @@ class HSSM_Main {
         add_action( 'admin_menu', array( $this, 'add_admin_menus' ) );
         add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_assets' ) );
         
-        // AJAX hooks for authenticated users
-        // Note: Main AJAX handlers are in HSSM_Frontend class
-        add_action( 'wp_ajax_hssm_send_preview_email', array( $this, 'ajax_send_preview_email' ) );
+        // AJAX hooks live on HSSM_Frontend. Preview email is still a coming-soon UI stub.
         
         // Cron hooks for scheduled slides
         add_action( 'hssm_check_scheduled_slides', array( $this, 'check_scheduled_slides' ) );
@@ -456,6 +454,7 @@ class HSSM_Main {
             'hssm_preview_page_slug' => 'slide-preview',
             'hssm_manager_page_slug' => 'slide-manager',
             'hssm_api_keys' => array( wp_generate_password( 32, false ) ), // Generate initial API key
+            'hssm_client_api_key' => '',
         );
         
         foreach ( $default_options as $option_name => $option_value ) {
@@ -482,6 +481,7 @@ class HSSM_Main {
             'hssm_preview_page_slug',
             'hssm_manager_page_slug',
             'hssm_api_keys',
+            'hssm_client_api_key',
             'hssm_notification_settings',
         );