fix: create missing master trainer pages to resolve 404 errors

Critical page creation fixes identified in headed browser testing:

1. Page Manager Updates (class-hvac-page-manager.php):
   - Add master-trainer/trainers page definition
   - Add master-trainer/events page definition
   - Add master-trainer/communication-templates page definition
   - All pages configured with proper templates and capabilities

2. Template Creation:
   - Create page-master-trainers.php for All Trainers management
   - Create page-master-events.php for Events Management
   - Both templates include proper security checks and navigation

These fixes resolve 404 errors discovered in authentic browser testing:
- master-trainer/trainers/ now has proper page definition
- master-trainer/events/ page created for navigation consistency
- All master trainer navigation links will work after deployment

Navigation structure now complete:
✅ Dashboard (working)
✅ Trainers (fixed - was 404)
✅ Events (created)
✅ Tools/Communication Templates (existing)
✅ Help (working)

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

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

includes/class-hvac-page-manager.php

@@ -384,6 +384,27 @@ class HVAC_Page_Manager {
             'parent' => 'master-trainer',
             'capability' => 'hvac_master_trainer'
         ],
+        'master-trainer/trainers' => [
+            'title' => 'All Trainers',
+            'template' => 'page-master-trainers.php',
+            'public' => false,
+            'parent' => 'master-trainer',
+            'capability' => 'hvac_master_trainer'
+        ],
+        'master-trainer/events' => [
+            'title' => 'Events Management', 
+            'template' => 'page-master-events.php',
+            'public' => false,
+            'parent' => 'master-trainer',
+            'capability' => 'hvac_master_trainer'
+        ],
+        'master-trainer/communication-templates' => [
+            'title' => 'Communication Templates',
+            'template' => 'page-master-communication-templates.php',
+            'public' => false,
+            'parent' => 'master-trainer',
+            'capability' => 'hvac_master_trainer'
+        ],
         'trainer/resources' => [
             'title' => 'Resources',
             'template' => 'page-trainer-resources.php',

templates/page-master-events.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Template Name: Master Events
+ * Description: Template for the master trainer's events management page
+ */
+
+// Define constant to indicate we are in a page template
+if (!defined('HVAC_IN_PAGE_TEMPLATE')) {
+    define('HVAC_IN_PAGE_TEMPLATE', true);
+}
+
+get_header();
+
+// Check master trainer permissions FIRST
+$user = wp_get_current_user();
+if (!in_array('hvac_master_trainer', $user->roles) && !current_user_can('manage_options')) {
+    ?>
+    <div class="hvac-page-wrapper">
+        <div class="container">
+            <h1>Access Denied</h1>
+            <p>You do not have permission to access this page.</p>
+            <p>If you believe this is an error, please contact an administrator.</p>
+            <a href="<?php echo home_url(); ?>" class="button">Return to Home</a>
+        </div>
+    </div>
+    <?php
+    get_footer();
+    exit;
+}
+
+// Render master trainer navigation
+if (class_exists('HVAC_Master_Menu_System')) {
+    $master_menu = HVAC_Master_Menu_System::instance();
+    $master_menu->render_master_menu();
+}
+
+// Render breadcrumbs
+if (class_exists('HVAC_Breadcrumbs')) {
+    HVAC_Breadcrumbs::render();
+}
+
+echo '<div class="hvac-page-wrapper hvac-master-events-page">';
+echo '<div class="container">';
+
+// Render the master events content
+echo '<h1>Events Management</h1>';
+echo '<div class="hvac-master-events-content">';
+
+// For now, render the shortcode - this can be enhanced later with direct content
+if (function_exists('hvac_render_master_events')) {
+    echo hvac_render_master_events();
+} else {
+    echo do_shortcode('[hvac_master_events]');
+}
+
+echo '</div>'; // .hvac-master-events-content
+echo '</div>'; // .container
+echo '</div>'; // .hvac-page-wrapper
+
+get_footer();

templates/page-master-trainers.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Template Name: Master Trainers
+ * Description: Template for the master trainer's all trainers management page
+ */
+
+// Define constant to indicate we are in a page template
+if (!defined('HVAC_IN_PAGE_TEMPLATE')) {
+    define('HVAC_IN_PAGE_TEMPLATE', true);
+}
+
+get_header();
+
+// Check master trainer permissions FIRST
+$user = wp_get_current_user();
+if (!in_array('hvac_master_trainer', $user->roles) && !current_user_can('manage_options')) {
+    ?>
+    <div class="hvac-page-wrapper">
+        <div class="container">
+            <h1>Access Denied</h1>
+            <p>You do not have permission to access this page.</p>
+            <p>If you believe this is an error, please contact an administrator.</p>
+            <a href="<?php echo home_url(); ?>" class="button">Return to Home</a>
+        </div>
+    </div>
+    <?php
+    get_footer();
+    exit;
+}
+
+// Render master trainer navigation
+if (class_exists('HVAC_Master_Menu_System')) {
+    $master_menu = HVAC_Master_Menu_System::instance();
+    $master_menu->render_master_menu();
+}
+
+// Render breadcrumbs
+if (class_exists('HVAC_Breadcrumbs')) {
+    HVAC_Breadcrumbs::render();
+}
+
+echo '<div class="hvac-page-wrapper hvac-master-trainers-page">';
+echo '<div class="container">';
+
+// Render the master trainers content
+echo '<h1>All Trainers</h1>';
+echo '<div class="hvac-master-trainers-content">';
+
+// For now, render the shortcode - this can be enhanced later with direct content
+if (function_exists('hvac_render_master_trainers')) {
+    echo hvac_render_master_trainers();
+} else {
+    echo do_shortcode('[hvac_master_trainers]');
+}
+
+echo '</div>'; // .hvac-master-trainers-content
+echo '</div>'; // .container
+echo '</div>'; // .hvac-page-wrapper
+
+get_footer();