feat: Add admin and master trainer support to navigation system

Enhanced navigation system to support multiple user types:

✅ USER TYPE SUPPORT:
- HVAC Trainers: Full navigation access
- HVAC Master Trainers: Full navigation + Master Dashboard link
- WordPress Admins: Full navigation + Master Dashboard link

✅ NAVIGATION UPDATES:
- Added Master Dashboard as main menu item for masters/admins
- Updated capability checks to allow admin access to all items
- Created user_can_access_item() helper method for flexible permissions
- Admins can now access all trainer functionality

✅ MASTER DASHBOARD INTEGRATION:
- Master Dashboard link prominently displayed for qualified users
- Maintains existing Master Trainer submenu structure
- Clean separation between regular trainer and master trainer features

✅ CAPABILITY SYSTEM:
- hvac_trainer: Basic trainer navigation
- hvac_master_trainer: Enhanced navigation with master features
- manage_options: Full administrative access to all features

Navigation now properly displays for WordPress administrators, providing full access to the HVAC trainer system while maintaining proper role-based permissions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

includes/class-hvac-trainer-navigation.php

@@ -57,6 +57,7 @@ class HVAC_Trainer_Navigation {
     private function get_menu_items() {
         $user = wp_get_current_user();
         $is_master = in_array('hvac_master_trainer', $user->roles);
+        $is_admin = current_user_can('manage_options');
         
         $menu_items = array(
             'dashboard' => array(
@@ -149,8 +150,18 @@ class HVAC_Trainer_Navigation {
             )
         );
         
-        // Add master trainer items if applicable
+        // Add Master Dashboard as main menu item for master trainers and admins
-        if ($is_master) {
+        if ($is_master || $is_admin) {
+            $menu_items['master-dashboard'] = array(
+                'label' => 'Master Dashboard',
+                'url' => '/master-trainer/master-dashboard/',
+                'icon' => 'dashicons-star-filled',
+                'capability' => 'hvac_master_trainer'
+            );
+        }
+        
+        // Add master trainer items if applicable (for master trainers or WordPress admins)
+        if ($is_master || $is_admin) {
             $menu_items['master'] = array(
                 'label' => 'Master Trainer',
                 'url' => '#',
@@ -179,6 +190,19 @@ class HVAC_Trainer_Navigation {
         return apply_filters('hvac_trainer_menu_items', $menu_items);
     }
     
+    /**
+     * Check if user can access item (admins can access everything)
+     */
+    private function user_can_access_item($capability) {
+        // WordPress admins can access everything
+        if (current_user_can('manage_options')) {
+            return true;
+        }
+        
+        // Otherwise check the specific capability
+        return current_user_can($capability);
+    }
+    
     /**
      * Get current page identifier
      */
@@ -233,7 +257,12 @@ class HVAC_Trainer_Navigation {
      * Render navigation shortcode
      */
     public function render_navigation($atts = array()) {
-        if (!is_user_logged_in() || !current_user_can('hvac_trainer')) {
+        if (!is_user_logged_in()) {
+            return '';
+        }
+        
+        // Show navigation for trainers, master trainers, or WordPress admins
+        if (!current_user_can('hvac_trainer') && !current_user_can('hvac_master_trainer') && !current_user_can('manage_options')) {
             return '';
         }
         
@@ -263,8 +292,8 @@ class HVAC_Trainer_Navigation {
         echo '<ul class="hvac-nav-menu">';
         
         foreach ($menu_items as $item_id => $item) {
-            // Check capability
+            // Check capability (allow admins to access everything)
-            if (isset($item['capability']) && !current_user_can($item['capability'])) {
+            if (isset($item['capability']) && !$this->user_can_access_item($item['capability'])) {
                 continue;
             }