refactor: redesign planos interface with design system patterns

- Create CreatePlanModal component with Headless UI Dialog
- Implement dark mode support throughout plans UI
- Update plans/page.tsx with professional card layout
- Update plans/[id]/page.tsx with consistent styling
- Add proper spacing, typography, and color consistency
- Implement smooth animations and transitions
- Add success/error message feedback
- Improve form UX with better input styling

front-end-agency/components/layout/SidebarRail.tsx

@@ -69,18 +69,22 @@ export const SidebarRail: React.FC<SidebarRailProps> = ({
                 if (res.ok) {
                     const data = await res.json();
                     if (currentUser) {
+                        // Usar localStorage como fallback se API não retornar logo
+                        const cachedLogo = localStorage.getItem('agency-logo-url');
+                        const finalLogoUrl = data.logo_url || cachedLogo;
+
                         const updatedUser = {
                             ...currentUser,
                             company: data.name || currentUser.company,
-                            logoUrl: data.logo_url
+                            logoUrl: finalLogoUrl
                         };
                         setUser(updatedUser);
                         saveAuth(token, updatedUser); // Persistir atualização
 
-                        // Atualizar localStorage do logo para uso do favicon
-                        if (data.logo_url) {
-                            console.log('📝 Salvando logo no localStorage:', data.logo_url);
-                            localStorage.setItem('agency-logo-url', data.logo_url);
+                        // Atualizar localStorage do logo (preservar se já existe)
+                        if (finalLogoUrl) {
+                            console.log('📝 Salvando logo no localStorage:', finalLogoUrl);
+                            localStorage.setItem('agency-logo-url', finalLogoUrl);
                             window.dispatchEvent(new Event('auth-update')); // Notificar favicon
                             window.dispatchEvent(new Event('branding-update')); // Notificar AgencyBranding
                         }