Fix queue handoff so tickets keep their number across services.

Handoff now frees the counter, ends the service session, and requeues
the same ticket for the next department — critical for hospital flows
like doctor → lab.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Ticket.php

@@ -66,4 +66,9 @@ class Ticket extends Model
     {
         return $this->hasMany(TicketEvent::class, 'ticket_id');
     }
+
+    public function transfers(): HasMany
+    {
+        return $this->hasMany(TicketTransfer::class, 'ticket_id')->orderByDesc('transferred_at');
+    }
 }