feat(header): adiciona link para changelog no dashboard

- Cria componente ChangelogLink com tooltip
- Adiciona link para /changelog ao lado do feedback
- Segue o padrão dos componentes existentes

components/header-dashboard.tsx

@@ -1,3 +1,4 @@
+import { ChangelogLink } from "@/components/changelog/changelog-link";
 import { FeedbackDialog } from "@/components/feedback/feedback-dialog";
 import { NotificationBell } from "@/components/notificacoes/notification-bell";
 import { SidebarTrigger } from "@/components/ui/sidebar";
@@ -28,6 +29,7 @@ export async function SiteHeader({ notificationsSnapshot }: SiteHeaderProps) {
           <PrivacyModeToggle />
           <AnimatedThemeToggler />
           <span className="text-muted-foreground">|</span>
+          <ChangelogLink />
           <FeedbackDialog />
           <LogoutButton />
         </div>