fix: publish toggle error alert and event visibility

- Add proper error handling to toggle_event_published.php with HTTP status codes
- Add try-catch block for database operations in toggle endpoint
- Update events.php query to only show published events (added published = 1 filter)
- Add updated_at timestamp update when toggling publish status
- Improve error messages for better debugging

src/pages/events/events.php

@@ -90,8 +90,8 @@ include_once($rootPath . '/header.php');
                 </div>
 
                 <?php
-                // Query to retrieve upcoming events
-                $stmt = $conn->prepare("SELECT event_id, date, time, name, image, description, feature, location, type, promo FROM events WHERE date > CURDATE() ORDER BY date ASC");
+                // Query to retrieve upcoming published events only
+                $stmt = $conn->prepare("SELECT event_id, date, time, name, image, description, feature, location, type, promo FROM events WHERE date > CURDATE() AND published = 1 ORDER BY date ASC");
                 $stmt->execute();
                 $result = $stmt->get_result();