style(checklist): padroniza botao Tornar opcional

Remove classes customizadas para usar mesmo estilo do Somente pendentes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/tickets/ticket-checklist-card.tsx

@@ -455,7 +455,6 @@ export function TicketChecklistCard({
                             type="button"
                             variant="outline"
                             size="sm"
-                            className="border-slate-300 bg-white text-xs font-medium text-slate-700 shadow-sm hover:border-slate-400 hover:bg-slate-50"
                             onClick={async () => {
                               if (!actorId) return
                               try {