优化：导航栏的显示

src/App.vue

@@ -13,9 +13,6 @@ const router = useRouter()
 const userStore = useUserStore()
 
 const currentRoute = computed(() => route.path)
-const displayName = computed(
-  () => userStore.user?.nickName || userStore.user?.userName || ''
-)
 
 async function refreshUserData() {
   if (!userStore.isLoggedIn) return
@@ -86,7 +83,6 @@ watch(
         >
           <span class="balance-text">${{ userStore.balance }}</span>
         </v-btn>
-        <span v-if="displayName" class="header-username">{{ displayName }}</span>
         <v-menu location="bottom" :close-on-content-click="false">
           <template #activator="{ props }">
             <v-btn v-bind="props" icon variant="text" class="avatar-btn">
@@ -129,16 +125,6 @@ watch(
   text-transform: none;
 }
 
-.header-username {
-  font-size: 0.9rem;
-  color: rgba(255, 255, 255, 0.95);
-  margin-right: 4px;
-  max-width: 120px;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
 .balance-text {
   font-weight: 500;
   font-size: 0.95rem;