feat(ui) : add app title with swap button in top nav bar

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/ui/AppTopNav.vue

@@ -7,6 +7,17 @@
       >
         <Icon name="mdi:menu" size="24" />
       </button>
+      <div class="hidden items-center gap-2 lg:flex">
+        <h1 class="text-lg font-bold tracking-tight">{{ appTitle }}</h1>
+        <button
+          type="button"
+          class="rounded-md p-1 text-white/60 transition-colors hover:bg-primary-600 hover:text-white"
+          :title="appTitle === 'NeauTime' ? 'Switch to Lesstime' : 'Switch to NeauTime'"
+          @click="toggleTitle"
+        >
+          <Icon name="mdi:swap-horizontal" size="18" />
+        </button>
+      </div>
       <div class="ml-auto flex items-center gap-4 text-xl text-white sm:gap-8">
         <NotificationBell />
         <div class="group relative flex gap-2 sm:gap-4">
@@ -45,6 +56,13 @@ defineProps<{
 const auth = useAuthStore()
 const ui = useUiStore()
 
+const appTitle = ref(localStorage.getItem('appTitle') || 'NeauTime')
+
+function toggleTitle() {
+  appTitle.value = appTitle.value === 'NeauTime' ? 'Lesstime' : 'NeauTime'
+  localStorage.setItem('appTitle', appTitle.value)
+}
+
 async function handleLogout() {
   await auth.logout()
   await navigateTo('/login')