feat: Integrate JS Gantt Chart library and update styles

- Added JS Gantt Chart library files including CSS and JS.
- Updated existing Gantt chart styles for better visual representation.
- Translated month and day names to Polish in the Gantt chart settings.
- Implemented Gantt chart initialization in the main view with sample data.
- Added a toggle switch for displaying tasks in the calendar.
- Enhanced task edit form with a new checkbox for calendar visibility.
- Improved the layout of the logged-in user template to include Gantt chart styles and scripts.

autoload/controls/class.Tasks.php

@@ -2,6 +2,40 @@
 namespace controls;
 class Tasks
 {
+  static public function gantt_json() {
+    global $mdb;
+
+    $tasks = $mdb -> query( 'SELECT t.id, t.name, t.date_start, t.date_end, t.status FROM tasks AS t WHERE show_in_calendar = 1 AND status != 2' ) -> fetchAll( \PDO::FETCH_ASSOC );
+    foreach ( $tasks as $task ) {
+
+      $class = '';
+      if ( $task['status'] == 6 )
+        $class = 'ganttGrey';
+      elseif ( $task['status'] == 5 )
+        $class = 'ganttRed';
+
+      $task_json['name'] = $task['name'];
+      $task_json['desc'] = 'Lorem ipsum dolor sit amet.';
+      $task_json['id'] = $task['id'];
+      $task_json['cssClass'] = 'redLabel';
+      $task_json['values'] = [
+        [
+          'from' => $task['date_start'] . ' 08:00',
+          'to' => $task['date_end'] . ' 16:00',
+          'label' => $task['name'],
+          'desc' => '',
+          'customClass' => $class
+        ]
+      ];
+      $data[] = $task_json;
+    }
+    header('Content-Type: application/json');
+
+    // Zwróć dane jako JSON
+    echo json_encode($data);
+    exit;
+  }
+
   static public function task_delete() {
     global $user;
 
@@ -365,7 +399,7 @@ class Tasks
     $values   = \S::json_to_array( \S::get( 'values' ) );
 
     if ( $id = \factory\Tasks::task_save(
-            $values['id'], null, $user['id'], $values['name'], $values['text'], $values['date_start'], $values['date_end'], $values['project_id'], $values['client_id'], $values['pay_rate'], $values['reminders_interval'], $values['recursively'], $values['frequency'], $values['period'], $values['users'], null, null, $values['send_email_notification'], $values['status_change_mail'], false, $values['status']
+            $values['id'], null, $user['id'], $values['name'], $values['text'], $values['date_start'], $values['date_end'], $values['project_id'], $values['client_id'], $values['pay_rate'], $values['reminders_interval'], $values['recursively'], $values['frequency'], $values['period'], $values['users'], null, null, $values['send_email_notification'], $values['status_change_mail'], false, $values['status'], $values['show_in_calendar']
           ) )
     {
       \factory\Tasks::clear_task_opened( $id );