Update AppHeader.vue to adjust logo height and margin for improved visual consistency

app/components/navigation/AppHeader.vue

@@ -14,7 +14,7 @@ const { loggedIn } = useAuth()
       <!-- Left: Logo + Role Switcher -->
       <div class="flex items-end gap-6 md:gap-8">
         <NuxtLink to="/" class="flex-shrink-0 transition-transform hover:scale-105">
-          <img src="/img/experimenta-logo-white.svg" alt="experimenta Logo" class="h-16 w-auto md:h-20 lg:h-22" />
+          <img src="/img/experimenta-logo-white.svg" alt="experimenta Logo" class="h-16 w-auto md:h-16 my-1" />
         </NuxtLink>
 
         <!-- Role Switcher (Desktop only, only when logged in) -->