fix: Resolve Login Page shortcode processing issue

- Fix the Trainer Login page to directly use Login_Handler class
- Skip shortcode processing and call render_login_form directly
- Ensure Login_Handler class is loaded before rendering the form

The issue was that the shortcode registration mechanism wasn't working properly
between the namespace and the static/non-static method calls. By directly
instantiating the Login_Handler class and calling the render method, we bypass
the shortcode system and directly render the login form.

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

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

wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/templates/page-community-login.php

@@ -18,7 +18,13 @@ get_header(); ?>
             <div class="entry-content">
                 <?php 
                 // Process the shortcode directly
-                echo do_shortcode('[hvac_community_login]'); 
+                // First instantiate the login handler class to ensure shortcode is registered
+                if (!class_exists('\\HVAC_Community_Events\\Community\\Login_Handler')) {
+                    require_once HVAC_CE_PLUGIN_DIR . 'includes/community/class-login-handler.php';
+                }
+                $login_handler = new \HVAC_Community_Events\Community\Login_Handler();
+                // Now call the render method directly
+                echo $login_handler->render_login_form(array());
                 ?>
             </div>
         </div>