fix: PHP errors and clean up error_log statements

- Fixed redirect_wc_pages_to_spa: added spa_mode check (only redirect when 'full')
- Fixed PHP fatal error: use get_queried_object() instead of global $product
- Removed all error_log debug statements from codebase
- Fixed broken syntax in PaymentGatewaysProvider.php after error_log removal

includes/Core/Notifications/PushNotificationHandler.php

@@ -229,7 +229,6 @@ class PushNotificationHandler {
 				self::queue_notification($subscription_id, $payload);
 				$sent++;
 			} catch (\Exception $e) {
-				error_log('Push notification error: ' . $e->getMessage());
 			}
 		}