fix: Add comprehensive MailQueue debugging and argument handling

🐛 Issue: Action Scheduler completing but wp_mail() never called

🔍 Enhanced Debugging:
- Log sendNow() entry with all arguments
- Log argument type and value
- Handle array vs string arguments (Action Scheduler compatibility)
- Log payload retrieval status
- Log wp_mail() call and result
- Log WooEmailOverride disable/enable
- Check database for option existence if not found
- Log hook registration on init

📝 Debug Output:
[WooNooW MailQueue] Hook registered
[WooNooW MailQueue] sendNow() called with args
[WooNooW MailQueue] email_id type: string/array
[WooNooW MailQueue] email_id value: xxx
[WooNooW MailQueue] Processing email_id: xxx
[WooNooW MailQueue] Payload retrieved - To: xxx, Subject: xxx
[WooNooW MailQueue] Disabling WooEmailOverride
[WooNooW MailQueue] Calling wp_mail() now...
[WooNooW MailQueue] wp_mail() returned: TRUE/FALSE
[WooNooW MailQueue] Re-enabling WooEmailOverride
[WooNooW MailQueue] Sent and deleted email ID

🎯 This will reveal:
1. If sendNow() is being called at all
2. What arguments Action Scheduler is passing
3. If payload is found in wp_options
4. If wp_mail() is actually called
5. If wp_mail() succeeds or fails

includes/Core/Mail/MailQueue.php

@@ -8,6 +8,10 @@ namespace WooNooW\Core\Mail;
 class MailQueue {
     public static function init() {
         add_action('woonoow/mail/send', [__CLASS__, 'sendNow'], 10, 1);
+        
+        if (defined('WP_DEBUG') && WP_DEBUG) {
+            error_log('[WooNooW MailQueue] Hook registered: woonoow/mail/send -> MailQueue::sendNow');
+        }
     }
 
     /**
@@ -41,9 +45,19 @@ class MailQueue {
      * Retrieves payload from wp_options and deletes it after sending.
      */
     public static function sendNow($email_id = null) {
-        // email_id should be passed directly as a string by Action Scheduler
+        error_log('[WooNooW MailQueue] sendNow() called with args: ' . print_r(func_get_args(), true));
+        error_log('[WooNooW MailQueue] email_id type: ' . gettype($email_id));
+        error_log('[WooNooW MailQueue] email_id value: ' . var_export($email_id, true));
+        
+        // Action Scheduler might pass an array, extract the first element
+        if (is_array($email_id)) {
+            error_log('[WooNooW MailQueue] email_id is array, extracting first element');
+            $email_id = $email_id[0] ?? null;
+        }
+        
+        // email_id should be a string
         if (empty($email_id)) {
-            error_log('[WooNooW MailQueue] ERROR: No email_id provided. Received: ' . print_r(func_get_args(), true));
+            error_log('[WooNooW MailQueue] ERROR: No email_id provided after extraction. Received: ' . print_r(func_get_args(), true));
             return;
         }
         
@@ -54,15 +68,27 @@ class MailQueue {
         
         if (!$p) {
             error_log('[WooNooW MailQueue] ERROR: Email payload not found for ID: ' . $email_id);
+            error_log('[WooNooW MailQueue] Checking if option exists in database...');
+            global $wpdb;
+            $exists = $wpdb->get_var($wpdb->prepare(
+                "SELECT COUNT(*) FROM {$wpdb->options} WHERE option_name = %s",
+                $email_id
+            ));
+            error_log('[WooNooW MailQueue] Option exists in DB: ' . ($exists ? 'yes' : 'no'));
             return;
         }
         
+        error_log('[WooNooW MailQueue] Payload retrieved - To: ' . ($p['to'] ?? 'unknown') . ', Subject: ' . ($p['subject'] ?? 'unknown'));
+        
         // Temporarily disable WooEmailOverride to prevent infinite loop
         if (class_exists('WooNooW\Core\Mail\WooEmailOverride')) {
+            error_log('[WooNooW MailQueue] Disabling WooEmailOverride to prevent loop');
             WooEmailOverride::disable();
         }
 
-        wp_mail(
+        error_log('[WooNooW MailQueue] Calling wp_mail() now...');
+        
+        $result = wp_mail(
             $p['to'] ?? '',
             $p['subject'] ?? '',
             $p['html'] ?? '',
@@ -70,16 +96,17 @@ class MailQueue {
             $p['attachments'] ?? []
         );
         
+        error_log('[WooNooW MailQueue] wp_mail() returned: ' . ($result ? 'TRUE (success)' : 'FALSE (failed)'));
+
         // Re-enable
         if (class_exists('WooNooW\Core\Mail\WooEmailOverride')) {
+            error_log('[WooNooW MailQueue] Re-enabling WooEmailOverride');
             WooEmailOverride::enable();
         }
         
         // Delete the temporary option after sending
         delete_option($email_id);
 
-        if (defined('WP_DEBUG') && WP_DEBUG) {
         error_log('[WooNooW MailQueue] Sent and deleted email ID: ' . $email_id . ' to: ' . ($p['to'] ?? 'unknown'));
     }
 }
-}