fix: login persistence, username login, realtime refresh, group name uniqueness

- Fix cookie path to '/' for auth persistence across page refreshes
- Login field now accepts both username and email
- Add 30s polling for group list and team session status refresh
- Add group name uniqueness check before creation

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/api/pocketbase.ts

@@ -10,7 +10,7 @@ pb.authStore.loadFromCookie(document.cookie)
 
 // 保存认证状态到 cookie
 pb.authStore.onChange(() => {
-  document.cookie = pb.authStore.exportToCookie({ httpOnly: false })
+  document.cookie = pb.authStore.exportToCookie({ httpOnly: false, path: '/' })
 })
 
 // 获取当前用户

frontend/src/components/group/CreateGroupDialog.vue

@@ -4,6 +4,7 @@ import { useRouter } from 'vue-router'
 import { ElMessage } from 'element-plus'
 import { useGroupStore } from '@/stores/group'
 import { createGroup } from '@/api/groups'
+import pb from '@/api/pocketbase'
 
 const props = defineProps<{
   modelValue: boolean
@@ -33,7 +34,20 @@ async function handleSubmit() {
     ElMessage.warning('请输入群组名称')
     return
   }
+
+  // 检查群组名是否重复
   loading.value = true
+  try {
+    const existing = await pb.collection('groups').getList(1, 1, {
+      filter: `name="${form.value.name.trim()}"`
+    })
+    if (existing.items.length > 0) {
+      ElMessage.warning('该群组名称已存在，请换一个')
+      loading.value = false
+      return
+    }
+  } catch { /* ignore */ }
+
   try {
     const group = await createGroup({
       name: form.value.name.trim(),

frontend/src/views/Layout.vue

@@ -23,16 +23,28 @@ const showScheduleModal = ref(false)
 const showCreateGroup = ref(false)
 const showJoinGroup = ref(false)
 
+let refreshTimer: ReturnType<typeof setInterval> | null = null
+
 onMounted(async () => {
   await userStore.initUser()
   await groupStore.loadGroups()
   await teamStore.loadActiveSession()
   await notificationStore.loadPendingInvitations()
   await notificationStore.startListening()
+
+  // 每30秒轮询刷新群组列表和临时小组状态
+  refreshTimer = setInterval(async () => {
+    await groupStore.loadGroups()
+    await teamStore.loadActiveSession()
+  }, 30000)
 })
 
 onUnmounted(() => {
   notificationStore.stopListening()
+  if (refreshTimer) {
+    clearInterval(refreshTimer)
+    refreshTimer = null
+  }
 })
 
 function handleLogout() {

frontend/src/views/Login.vue

@@ -9,19 +9,19 @@ import PasswordInput from '@/components/common/PasswordInput.vue'
 const router = useRouter()
 const userStore = useUserStore()
 
-const email = ref('')
+const identity = ref('')
 const password = ref('')
 const loading = ref(false)
 
 async function handleLogin() {
-  if (!email.value || !password.value) {
-    ElMessage.warning('请输入邮箱和密码')
+  if (!identity.value || !password.value) {
+    ElMessage.warning('请输入用户名/邮箱和密码')
     return
   }
 
   try {
     loading.value = true
-    await userStore.login(email.value, password.value)
+    await userStore.login(identity.value, password.value)
 
     const redirect = '/'
     router.push(redirect)
@@ -45,12 +45,11 @@ async function handleLogin() {
 
       <form class="login-form" @submit.prevent="handleLogin">
         <div class="form-group">
-          <label for="email">邮箱</label>
+          <label for="identity">用户名 / 邮箱</label>
           <el-input
-            id="email"
-            v-model="email"
-            type="email"
-            placeholder="请输入邮箱"
+            id="identity"
+            v-model="identity"
+            placeholder="请输入用户名或邮箱"
             required
           />
         </div>