feat: dashboard for role 'manager'

src/Entity/Assignment.php

@@ -28,6 +28,7 @@ class Assignment implements BlameableEntityInterface, TimestampableEntityInterfa
     public const STATUS_STAFFED = 'staffed';
     public const STATUS_PARTLY_STAFFED = 'partly_staffed';
     public const STATUS_STAFFING = 'staffing';
+    public const STATUS_UNSTAFFED = 'unstaffed';
 
     #[ORM\Id]
     #[ORM\GeneratedValue]