Discourage search engine helpful UI features

I have been using the Discourage Search Engines Notifier WordPress plugin on a lot of sites.
I wanted to extend it, so that is what I did.

I went to ChatGPT and asked for the following:

• Show an eye icon to the top black admin bar. Green for a search engine allowed or red for discouraged.
• Change the admin color scheme for the currently logged-in user:
  • blue when discourage search engines is ON (red eye)
  • fresh (default) when discourage is OFF (green eye)
• Add a standard WordPress snackbar mention with a note saying: “⚠️ This is a staging site — search engines are discouraged.“

Below one can see the eye in the top is red and the color scheme is light blue. There is also a WP snackbar notification.

The PHP Code snippet result.

// 1. Add eye icon in admin bar with red/green color
add_action('admin_bar_menu', function ($wp_admin_bar) {
    if (!current_user_can('manage_options')) {
        return;
    }

    $discouraged = get_option('blog_public') === '0';
    $class       = $discouraged ? 'seo-discouraged' : 'seo-allowed';
    $title       = $discouraged
        ? 'Search engines are discouraged from indexing this site.'
        : 'Search engines are allowed to index this site.';

    $wp_admin_bar->add_node([
        'id'    => 'se-visibility',
        'title' => '<span class="ab-icon dashicons dashicons-visibility"></span>',
        'href'  => admin_url('options-reading.php'),
        'meta'  => [
            'title' => $title,
            'class' => $class,
        ],
    ]);
}, 100);

// 2. Load Dashicons on frontend and admin
add_action('wp_enqueue_scripts', function () {
    if (is_user_logged_in() && is_admin_bar_showing()) {
        wp_enqueue_style('dashicons');
    }
}, 1);
add_action('admin_enqueue_scripts', function () {
    wp_enqueue_style('dashicons');
});

// 3. Output CSS for icon colors
add_action('wp_head', 'se_visibility_icon_styles', 1);
add_action('admin_head', 'se_visibility_icon_styles', 1);
function se_visibility_icon_styles() {
    ?>
    <style>
        /* Icon colors */
        #wpadminbar #wp-admin-bar-se-visibility.seo-discouraged .ab-icon:before {
            color: #dc3232 !important; /* red */
        }
        #wpadminbar #wp-admin-bar-se-visibility.seo-allowed .ab-icon:before {
            color: #46b450 !important; /* green */
        }
        #wpadminbar #wp-admin-bar-se-visibility .ab-icon {
            font: normal 20px/1 'dashicons';
            display: inline-block;
        }
    </style>
    <?php
}

// 4. Show persistent top admin notice for discourage ON, dismissible by user
add_action('admin_notices', function() {
    if (!current_user_can('manage_options')) {
        return;
    }

    if (get_option('blog_public') !== '0') {
        return;
    }
    ?>
    <div class="notice notice-warning is-dismissible" style="position:relative;">
        <p><strong>⚠️ This is a staging site — search engines are discouraged.</strong></p>
    </div>
    <?php
});

// 5. Change admin color scheme for current logged-in user based on discourage setting
add_action('admin_init', function() {
    if (!is_user_logged_in()) {
        return;
    }

    $user_id = get_current_user_id();
    $discouraged = get_option('blog_public') === '0';

    $desired_color = $discouraged ? 'blue' : 'fresh';
    $current_color = get_user_meta($user_id, 'admin_color', true);

    if ($current_color !== $desired_color) {
        update_user_meta($user_id, 'admin_color', $desired_color);
    }
});