style(sidebar): transforma subtitulo em badge pill

- Subtitulo agora aparece como badge com fundo escuro
- Alterado texto para "Plataforma de chamados"
- Estilo consistente com badges da plataforma

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

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

src/components/app-sidebar.tsx

@@ -253,7 +253,7 @@ export function AppSidebar({ ...props }: React.ComponentProps<typeof Sidebar>) {
           logoSrc="/logo-raven.png"
           logoAlt="Logotipo Raven"
           title="Raven"
-          subtitle="Chamados"
+          subtitle="Plataforma de chamados"
         />
       </SidebarHeader>
       <SidebarContent>

src/components/sidebar-brand.tsx

@@ -35,9 +35,11 @@ export function SidebarBrand({ logoSrc, logoAlt, title, subtitle }: SidebarBrand
                 priority
               />
             </div>
-            <div className="flex flex-col leading-none">
+            <div className="flex flex-col items-start gap-1 leading-none">
               <span className="text-lg font-semibold">{title}</span>
-              <span className="text-sm text-muted-foreground">{subtitle}</span>
+              <span className="inline-flex rounded-full bg-neutral-900 px-2.5 py-0.5 text-[11px] font-medium text-white">
+                {subtitle}
+              </span>
             </div>
           </div>
         </SidebarMenuButton>