fix: get helpers dynamically in config listener to avoid undefined errors

The config listener was capturing a static snapshot of helpers at
initialization time, which could contain empty placeholder objects
during async helper loading. This caused 'Cannot read properties of
undefined (reading name)' errors when tests tried to access helper
properties.

Changes:
- Move helpers retrieval inside event handler to get runtime instances
- Add guard clause to check helper validity before accessing properties
- Ensures we always get fully initialized helper instances, not placeholders

Fixes issue where actor I was empty {} and helper.constructor.name
threw undefined errors during Scenario execution.

Author: kobenguyent

lib/listener/config.js

@@ -12,15 +12,23 @@ export default function () {
     return
   }
   global.__codeceptConfigListenerInitialized = true
-  
-  const helpers = global.container.helpers()
 
   enableDynamicConfigFor('suite')
   enableDynamicConfigFor('test')
 
   function enableDynamicConfigFor(type) {
     event.dispatcher.on(event[type].before, (context = {}) => {
+      // Get helpers dynamically at runtime, not at initialization time
+      // This ensures we get the actual helper instances, not placeholders
+      const helpers = global.container.helpers()
+
       function updateHelperConfig(helper, config) {
+        // Guard against undefined or invalid helpers
+        if (!helper || !helper.constructor) {
+          output.debug(`[${ucfirst(type)} Config] Helper not found or not properly initialized`)
+          return
+        }
+
         const oldConfig = deepClone(helper.options)
         try {
           helper._setConfig(deepMerge(deepClone(oldConfig), config))
@@ -41,7 +49,7 @@ export default function () {
         for (let name in context.config) {
           const config = context.config[name]
           if (name === '0') {
-            // first helper
+            // first helper - get dynamically
             name = Object.keys(helpers)[0]
           }
           const helper = helpers[name]