feat(phase2e-2): 会议内聊天面板落地（Task 12）

- 新增 ChatPanel 组件：右侧抽屉式聊天 UI，支持发送/加载更早消息/未读清零
- store/meeting.js：扩展 chatHasMore/chatUnreadCount/chatHistoryLoaded 等状态与 loadMoreChats/markChatsRead 动作；WS 消息到达时按 id 去重
- room.vue：替换临时 toast 占位为 ChatPanel，绑定未读徽标、成员展示名映射；watch unread 自动在面板打开时清零
- 后端：SendChat WS 广播与 REST 响应补充 user_name/user_avatar，聊天面板无需额外查询即可展示昵称

Made-with: Cursor

backend/go-service/app/meeting/controller/meeting_controller.go

@@ -127,17 +127,23 @@ func participantToDTO(p *model.MeetingParticipant) *dto.MeetingParticipantDTO {
 }
 
 // chatToDTO 将 model.MeetingChat 转 DTO
-func chatToDTO(m *model.MeetingChat) *dto.MeetingChatDTO {
+// userMap 可选：若提供则附带 user_name / user_avatar，否则为空
+func chatToDTO(m *model.MeetingChat, userMap map[int64]service.UserDisplayInfo) *dto.MeetingChatDTO {
 	if m == nil {
 		return nil
 	}
-	return &dto.MeetingChatDTO{
+	d := &dto.MeetingChatDTO{
 		ID:        m.ID,
 		RoomID:    m.RoomID,
 		UserID:    m.UserID,
 		Content:   m.Content,
 		CreatedAt: m.CreatedAt.Format("2006-01-02 15:04:05"),
 	}
+	if info, ok := userMap[m.UserID]; ok {
+		d.UserName = info.Name
+		d.UserAvatar = info.Avatar
+	}
+	return d
 }
 
 // ====== REST API ======
@@ -398,7 +404,8 @@ func (ctl *MeetingController) SendChat(c *gin.Context) {
 		ctl.handleError(c, err, "发送会议聊天失败")
 		return
 	}
-	utils.ResponseCreated(c, dto.SendMeetingChatResponse{Message: *chatToDTO(msg)})
+	userMap := ctl.meetingService.ResolveUsersDisplay(c.Request.Context(), []int64{msg.UserID})
+	utils.ResponseCreated(c, dto.SendMeetingChatResponse{Message: *chatToDTO(msg, userMap)})
 }
 
 // ListChats GET /api/v1/meeting/rooms/:code/chats?before_id=&limit=
@@ -419,9 +426,14 @@ func (ctl *MeetingController) ListChats(c *gin.Context) {
 		ctl.handleError(c, err, "获取会议聊天失败")
 		return
 	}
+	userIDs := make([]int64, 0, len(msgs))
+	for i := range msgs {
+		userIDs = append(userIDs, msgs[i].UserID)
+	}
+	userMap := ctl.meetingService.ResolveUsersDisplay(c.Request.Context(), userIDs)
 	list := make([]dto.MeetingChatDTO, 0, len(msgs))
 	for i := range msgs {
-		list = append(list, *chatToDTO(&msgs[i]))
+		list = append(list, *chatToDTO(&msgs[i], userMap))
 	}
 	utils.ResponseOK(c, dto.ListMeetingChatsResponse{List: list, HasMore: hasMore})
 }

backend/go-service/app/meeting/service/meeting_service.go

@@ -150,6 +150,63 @@ func (s *MeetingService) broadcastToActiveParticipants(ctx context.Context, room
 	s.broadcaster.BroadcastToMeeting(ctx, roomID, event, data, excludeUserIDs...)
 }
 
+// UserDisplayInfo 用户展示信息（昵称优先，降级为用户名；头像可空）
+type UserDisplayInfo struct {
+	Name   string
+	Avatar string
+}
+
+// resolveUserDisplay 查单个用户的展示信息；查询失败/未命中时返回空字符串
+// 仅服务层内部使用，调用方失败时降级为 user_name="" 即可
+func (s *MeetingService) resolveUserDisplay(ctx context.Context, userID int64) (name string, avatar string) {
+	if s.userResolver == nil || userID <= 0 {
+		return "", ""
+	}
+	users, err := s.userResolver.GetUsersByIDs(ctx, []int64{userID})
+	if err != nil || len(users) == 0 {
+		return "", ""
+	}
+	u := users[0]
+	if u.Nickname != "" {
+		return u.Nickname, u.Avatar
+	}
+	return u.Username, u.Avatar
+}
+
+// ResolveUsersDisplay 批量查询用户展示信息，controller 端用于填充 DTO
+// 返回 map[userID]UserDisplayInfo，查询失败时返回空 map（调用方按降级处理）
+func (s *MeetingService) ResolveUsersDisplay(ctx context.Context, userIDs []int64) map[int64]UserDisplayInfo {
+	out := make(map[int64]UserDisplayInfo, len(userIDs))
+	if s.userResolver == nil || len(userIDs) == 0 {
+		return out
+	}
+	// 去重
+	seen := make(map[int64]struct{}, len(userIDs))
+	unique := make([]int64, 0, len(userIDs))
+	for _, id := range userIDs {
+		if id <= 0 {
+			continue
+		}
+		if _, ok := seen[id]; ok {
+			continue
+		}
+		seen[id] = struct{}{}
+		unique = append(unique, id)
+	}
+	users, err := s.userResolver.GetUsersByIDs(ctx, unique)
+	if err != nil {
+		return out
+	}
+	for _, u := range users {
+		name := u.Nickname
+		if name == "" {
+			name = u.Username
+		}
+		out[u.ID] = UserDisplayInfo{Name: name, Avatar: u.Avatar}
+	}
+	return out
+}
+
 // ====== 会议生命周期 ======
 
 // CreateRoom 创建即时会议
@@ -773,12 +830,17 @@ func (s *MeetingService) SendChatMessage(ctx context.Context, userID int64, code
 		return nil, err
 	}
 
+	// 附带 user_name / user_avatar，前端聊天面板无需额外拉取
+	userName, userAvatar := s.resolveUserDisplay(ctx, userID)
+
 	go s.broadcastToActiveParticipants(context.Background(), room.ID, constants.MeetingWSEventChatMessage, map[string]interface{}{
-		"room_code":  code,
+		"room_code":   code,
-		"message_id": chat.ID,
+		"message_id":  chat.ID,
-		"user_id":    userID,
+		"user_id":     userID,
-		"content":    content,
+		"user_name":   userName,
-		"created_at": chat.CreatedAt.Format("2006-01-02 15:04:05"),
+		"user_avatar": userAvatar,
+		"content":     content,
+		"created_at":  chat.CreatedAt.Format("2006-01-02 15:04:05"),
 	}, userID)
 
 	logs.Debug(ctx, funcName, "会议聊天已发送",

frontend/src/components/meeting/ChatPanel.vue

@@ -0,0 +1,399 @@
+<!--
+  会议聊天面板（Task 12）
+
+  职责：
+  - 右侧抽屉式消息流 + 底部输入框，抽屉风格与 MemberPanel 对齐
+  - 自己与他人的消息分别右 / 左对齐；同一人连续消息聚合头像
+  - 顶部"加载更多历史"按钮；首次打开时派发 @request-load 由父层触发一次懒加载
+
+  约束：
+  - 纯受控组件，不直接依赖 Pinia；由父组件把 messages/hasMore 等数据传入
+  - 发送通过 @send 事件回传，成功/失败由父层决定是否 toast
+-->
+<template>
+  <view v-if="visible" class="panel-root" @click.self="close">
+    <view class="panel" :class="{ show }">
+      <view class="header">
+        <view class="title-area">
+          <text class="title">会议聊天</text>
+          <text class="count">({{ messages.length }})</text>
+        </view>
+        <view class="btn-close" @click="close">
+          <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+            <line x1="18" y1="6" x2="6" y2="18"></line>
+            <line x1="6" y1="6" x2="18" y2="18"></line>
+          </svg>
+        </view>
+      </view>
+
+      <scroll-view
+        class="msg-list"
+        :scroll-y="true"
+        :scroll-top="scrollTop"
+        :scroll-with-animation="scrollAnimate"
+        @scroll="onScroll"
+      >
+        <view v-if="hasMore" class="load-more" @click="$emit('load-more')">
+          <text v-if="!loadingMore">加载更早的消息</text>
+          <text v-else>加载中…</text>
+        </view>
+        <view v-else-if="messages.length" class="load-end">
+          <text>没有更早的消息了</text>
+        </view>
+
+        <view
+          v-for="(m, idx) in messages"
+          :key="m.id || `tmp_${idx}`"
+          class="msg-row"
+          :class="{ self: m.user_id === currentUserId, 'merge-top': isMergedWithPrev(idx) }"
+        >
+          <view v-if="!isMergedWithPrev(idx)" class="avatar" :style="avatarStyle(m.user_id)">
+            {{ initialOf(m) }}
+          </view>
+          <view v-else class="avatar-placeholder"></view>
+
+          <view class="bubble-area">
+            <view v-if="!isMergedWithPrev(idx)" class="meta">
+              <text class="meta-name">{{ m.user_id === currentUserId ? '我' : displayName(m) }}</text>
+              <text class="meta-time">{{ formatTime(m.created_at) }}</text>
+            </view>
+            <view class="bubble" :class="{ self: m.user_id === currentUserId }">
+              <text>{{ m.content }}</text>
+            </view>
+          </view>
+        </view>
+
+        <view v-if="!messages.length" class="empty">
+          <text>发送第一条消息，开始会议内对话</text>
+        </view>
+
+        <view :style="{ height: '4rpx' }" ref="bottomAnchor"></view>
+      </scroll-view>
+
+      <view class="input-area">
+        <textarea
+          class="input"
+          :value="draft"
+          placeholder="说点什么…"
+          :maxlength="500"
+          :adjust-position="false"
+          :cursor-spacing="10"
+          @input="onDraftInput"
+          @confirm="onSend"
+        />
+        <button class="btn-send" :disabled="!canSend || sending" @click="onSend">
+          <text v-if="!sending">发送</text>
+          <text v-else>发送中</text>
+        </button>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script setup>
+import { ref, computed, watch, nextTick } from 'vue'
+
+const props = defineProps({
+  visible: { type: Boolean, default: false },
+  messages: { type: Array, default: () => [] },
+  hasMore: { type: Boolean, default: true },
+  loadingMore: { type: Boolean, default: false },
+  currentUserId: { type: [Number, String], default: 0 },
+  displayNameMap: { type: Object, default: () => ({}) }
+})
+
+const emit = defineEmits(['close', 'send', 'load-more', 'request-initial-load'])
+
+const show = ref(false)
+const draft = ref('')
+const sending = ref(false)
+const scrollTop = ref(0)
+const scrollAnimate = ref(true)
+const userScrolledUp = ref(false)
+const lastScrollTop = ref(0)
+
+watch(() => props.visible, async (v) => {
+  if (v) {
+    setTimeout(() => { show.value = true }, 10)
+    emit('request-initial-load')
+    await nextTick()
+    scrollToBottom(false)
+  } else {
+    show.value = false
+  }
+}, { immediate: true })
+
+// 新消息到达时，若用户未向上翻阅，自动滚到底
+watch(() => props.messages.length, async () => {
+  if (!props.visible) return
+  await nextTick()
+  if (!userScrolledUp.value) scrollToBottom(true)
+})
+
+const canSend = computed(() => draft.value.trim().length > 0)
+
+const onDraftInput = (e) => {
+  draft.value = e?.detail?.value ?? e?.target?.value ?? ''
+}
+
+const onSend = async () => {
+  const content = draft.value.trim()
+  if (!content || sending.value) return
+  sending.value = true
+  try {
+    await emit('send', content)
+    draft.value = ''
+    await nextTick()
+    scrollToBottom(true)
+  } finally {
+    sending.value = false
+  }
+}
+
+const scrollToBottom = (animated) => {
+  scrollAnimate.value = animated
+  // 不可随便等于 last，不触发；每次加一个微量触发重置 scrollTop
+  const next = scrollTop.value + 1
+  scrollTop.value = 999999
+  setTimeout(() => { if (scrollTop.value === 999999) scrollTop.value = next }, 30)
+  userScrolledUp.value = false
+}
+
+const onScroll = (e) => {
+  const top = e?.detail?.scrollTop ?? 0
+  // 若用户明显向上拉动（大于 60），则记为"手动上滚"，暂停自动滚动
+  if (top < lastScrollTop.value - 40) userScrolledUp.value = true
+  // 拉到底时恢复自动滚动
+  const max = (e?.detail?.scrollHeight || 0) - (e?.detail?.viewportHeight || e?.detail?.wheelDeltaY || 0)
+  if (max > 0 && top >= max - 20) userScrolledUp.value = false
+  lastScrollTop.value = top
+}
+
+/** 相邻消息同一个发送者且间隔 < 5 分钟 → 合并头像 */
+const isMergedWithPrev = (idx) => {
+  if (idx === 0) return false
+  const cur = props.messages[idx]
+  const prev = props.messages[idx - 1]
+  if (!cur || !prev) return false
+  if (cur.user_id !== prev.user_id) return false
+  const diff = timestampOf(cur) - timestampOf(prev)
+  return diff >= 0 && diff < 5 * 60 * 1000
+}
+
+const timestampOf = (m) => {
+  if (!m?.created_at) return 0
+  const t = Date.parse(String(m.created_at).replace(' ', 'T'))
+  return Number.isFinite(t) ? t : 0
+}
+
+const displayName = (m) => {
+  if (m.user_name) return m.user_name
+  if (props.displayNameMap[m.user_id]) return props.displayNameMap[m.user_id]
+  return `用户 ${m.user_id}`
+}
+
+const initialOf = (m) => {
+  const n = (m.user_id === props.currentUserId ? '我' : displayName(m)).trim()
+  return n ? n.charAt(0).toUpperCase() : '?'
+}
+
+const avatarStyle = (uid) => {
+  const seed = String(uid || '0')
+  let h = 0
+  for (let i = 0; i < seed.length; i++) h = (h * 31 + seed.charCodeAt(i)) % 360
+  return { background: `hsl(${h}, 60%, 48%)` }
+}
+
+const formatTime = (iso) => {
+  if (!iso) return ''
+  const t = Date.parse(String(iso).replace(' ', 'T'))
+  if (!Number.isFinite(t)) return ''
+  const d = new Date(t)
+  const pad = (n) => n < 10 ? `0${n}` : String(n)
+  const now = new Date()
+  const sameDay = d.getFullYear() === now.getFullYear()
+    && d.getMonth() === now.getMonth()
+    && d.getDate() === now.getDate()
+  if (sameDay) return `${pad(d.getHours())}:${pad(d.getMinutes())}`
+  return `${d.getMonth() + 1}/${d.getDate()} ${pad(d.getHours())}:${pad(d.getMinutes())}`
+}
+
+const close = () => emit('close')
+</script>
+
+<style scoped>
+.panel-root {
+  position: fixed;
+  inset: 0;
+  z-index: 205;
+  background: rgba(0, 0, 0, 0.45);
+  display: flex;
+  justify-content: flex-end;
+}
+
+.panel {
+  width: 640rpx;
+  max-width: 92vw;
+  height: 100%;
+  background: #1F2937;
+  color: #F3F4F6;
+  display: flex;
+  flex-direction: column;
+  transform: translateX(100%);
+  transition: transform 0.24s ease;
+  box-shadow: -4rpx 0 24rpx rgba(0, 0, 0, 0.4);
+}
+.panel.show { transform: translateX(0); }
+
+.header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 28rpx 32rpx;
+  border-bottom: 1rpx solid rgba(255, 255, 255, 0.08);
+  flex-shrink: 0;
+}
+.title-area { display: flex; align-items: baseline; gap: 10rpx; }
+.title { font-size: 32rpx; font-weight: 600; }
+.count { color: rgba(255, 255, 255, 0.5); font-size: 24rpx; }
+.btn-close {
+  width: 56rpx;
+  height: 56rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  color: rgba(255, 255, 255, 0.7);
+  cursor: pointer;
+}
+.btn-close:hover { background: rgba(255, 255, 255, 0.08); }
+
+.msg-list {
+  flex: 1;
+  padding: 16rpx 24rpx 24rpx;
+  box-sizing: border-box;
+}
+
+.load-more, .load-end {
+  text-align: center;
+  font-size: 22rpx;
+  color: rgba(255, 255, 255, 0.5);
+  padding: 14rpx 0;
+  cursor: pointer;
+}
+.load-more:hover { color: rgba(255, 255, 255, 0.8); }
+
+.empty {
+  padding: 100rpx 0 80rpx;
+  text-align: center;
+  color: rgba(255, 255, 255, 0.45);
+  font-size: 24rpx;
+}
+
+.msg-row {
+  display: flex;
+  gap: 16rpx;
+  padding: 8rpx 0;
+}
+.msg-row.merge-top { margin-top: -12rpx; padding-top: 0; }
+.msg-row.self { flex-direction: row-reverse; }
+
+.avatar {
+  flex-shrink: 0;
+  width: 64rpx;
+  height: 64rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 26rpx;
+  font-weight: 600;
+  color: #FFFFFF;
+}
+.avatar-placeholder {
+  flex-shrink: 0;
+  width: 64rpx;
+}
+
+.bubble-area {
+  display: flex;
+  flex-direction: column;
+  gap: 8rpx;
+  max-width: 70%;
+  min-width: 0;
+}
+.msg-row.self .bubble-area { align-items: flex-end; }
+
+.meta {
+  display: flex;
+  align-items: baseline;
+  gap: 10rpx;
+  color: rgba(255, 255, 255, 0.55);
+  font-size: 20rpx;
+}
+.msg-row.self .meta { flex-direction: row-reverse; }
+.meta-name { font-weight: 500; color: rgba(255, 255, 255, 0.85); font-size: 22rpx; }
+.meta-time { font-family: 'SF Mono', 'Menlo', monospace; }
+
+.bubble {
+  padding: 14rpx 20rpx;
+  border-radius: 16rpx;
+  background: rgba(55, 65, 81, 0.9);
+  color: #F3F4F6;
+  font-size: 26rpx;
+  line-height: 1.55;
+  word-break: break-word;
+  white-space: pre-wrap;
+  max-width: 100%;
+}
+.bubble.self {
+  background: #3B82F6;
+  color: #FFFFFF;
+  border-bottom-right-radius: 4rpx;
+}
+.bubble:not(.self) { border-bottom-left-radius: 4rpx; }
+
+.input-area {
+  display: flex;
+  align-items: flex-end;
+  gap: 12rpx;
+  padding: 16rpx 24rpx calc(16rpx + env(safe-area-inset-bottom));
+  border-top: 1rpx solid rgba(255, 255, 255, 0.08);
+  flex-shrink: 0;
+}
+.input {
+  flex: 1;
+  background: rgba(55, 65, 81, 0.6);
+  border: 1rpx solid rgba(255, 255, 255, 0.1);
+  border-radius: 14rpx;
+  padding: 14rpx 18rpx;
+  color: #F3F4F6;
+  font-size: 26rpx;
+  line-height: 1.5;
+  min-height: 64rpx;
+  max-height: 220rpx;
+  box-sizing: border-box;
+}
+.input:focus {
+  border-color: rgba(59, 130, 246, 0.7);
+  outline: none;
+}
+
+.btn-send {
+  all: unset;
+  cursor: pointer;
+  padding: 14rpx 28rpx;
+  background: #3B82F6;
+  color: #FFFFFF;
+  font-size: 26rpx;
+  font-weight: 600;
+  border-radius: 14rpx;
+  transition: background-color 0.15s ease;
+  flex-shrink: 0;
+}
+.btn-send:hover { background: #2563EB; }
+.btn-send[disabled] {
+  background: rgba(59, 130, 246, 0.35);
+  cursor: not-allowed;
+}
+</style>

frontend/src/pages/meeting/room.vue

@@ -92,6 +92,20 @@
       @close="inviteVisible = false"
     />
 
+    <!-- 聊天面板 -->
+    <ChatPanel
+      :visible="chatVisible"
+      :messages="chatMessages"
+      :current-user-id="myUserId"
+      :display-name-map="displayNameMap"
+      :has-more="chatHasMore"
+      :loading-more="chatLoadingMore"
+      @close="closeChat"
+      @send="onChatSend"
+      @load-more="onChatLoadMore"
+      @request-initial-load="onChatRequestInitialLoad"
+    />
+
     <!-- 离会确认弹窗 -->
     <view v-if="leaveDialogVisible" class="leave-mask" @click.self="leaveDialogVisible = false">
       <view class="leave-modal">
@@ -132,17 +146,19 @@ import MeetingToolbar from '@/components/meeting/MeetingToolbar.vue'
 import MemberPanel from '@/components/meeting/MemberPanel.vue'
 import InviteDialog from '@/components/meeting/InviteDialog.vue'
 import NetworkBadge from '@/components/meeting/NetworkBadge.vue'
+import ChatPanel from '@/components/meeting/ChatPanel.vue'
 
 const meetingStore = useMeetingStore()
 const userStore = useUserStore()
 
 const memberVisible = ref(false)
 const inviteVisible = ref(false)
+const chatVisible = ref(false)
 const leaveDialogVisible = ref(false)
 const audioLoading = ref(false)
 const videoLoading = ref(false)
+const chatLoadingMore = ref(false)
 const networkLevel = ref(4) // Task 15 接入真实 getStats 后动态更新
-const unreadChatCount = ref(0) // Task 14 接入 chat 后动态更新
 const startedAt = ref(0)
 const nowTs = ref(Date.now())
 let timerHandle = null
@@ -181,6 +197,9 @@ const allowChat = computed(() => {
   }
 })
 const invitePassword = computed(() => meetingStore.draftCreatePayload?.password || '')
+const chatMessages = computed(() => meetingStore.chatMessages)
+const chatHasMore = computed(() => meetingStore.chatHasMore)
+const unreadChatCount = computed(() => meetingStore.chatUnreadCount)
 
 const formattedCode = computed(() => {
   const d = String(roomCode.value || '').replace(/\D/g, '')
@@ -358,8 +377,41 @@ const onCamToggle = async () => {
 const openInvite = () => { inviteVisible.value = true }
 const openMembers = () => { memberVisible.value = true }
 const openChat = () => {
-  // Task 14 会议聊天入口；当前阶段仅提示
+  chatVisible.value = true
-  uni.showToast({ title: '聊天功能即将上线', icon: 'none' })
+  meetingStore.markChatsRead()
+}
+const closeChat = () => { chatVisible.value = false }
+
+watch(unreadChatCount, (count) => {
+  if (count > 0 && chatVisible.value) {
+    meetingStore.markChatsRead()
+  }
+})
+
+const onChatSend = async (content) => {
+  try {
+    await meetingStore.sendChat(content)
+  } catch (err) {
+    uni.showToast({ title: err?.message || '发送失败', icon: 'none' })
+    throw err
+  }
+}
+
+const onChatLoadMore = async () => {
+  if (chatLoadingMore.value) return
+  chatLoadingMore.value = true
+  try {
+    await meetingStore.loadMoreChats(30)
+  } catch (err) {
+    uni.showToast({ title: err?.message || '加载失败', icon: 'none' })
+  } finally {
+    chatLoadingMore.value = false
+  }
+}
+
+const onChatRequestInitialLoad = async () => {
+  if (meetingStore.chatHistoryLoaded) return
+  await onChatLoadMore()
 }
 
 const onKickMember = async (uid) => {

frontend/src/store/meeting.js

@@ -79,9 +79,18 @@ export const useMeetingStore = defineStore('meeting', () => {
   /** 活跃参与者列表（含当前用户，按加入时间正序） */
   const participants = ref([])
 
-  /** 会议聊天消息列表（最新在尾部） */
+  /** 会议聊天消息列表（按 ID 升序，最新在尾部） */
   const chatMessages = ref([])
 
+  /** 会议聊天还有更早消息可加载（用于"加载更多"按钮） */
+  const chatHasMore = ref(true)
+
+  /** 会议聊天未读计数（来自他人且 ChatPanel 未打开期间累积） */
+  const chatUnreadCount = ref(0)
+
+  /** 会议聊天首次懒加载完成标记 */
+  const chatHistoryLoaded = ref(false)
+
   /** 最近一次会议结束原因（room.ended_reason 或 room.ended.reason） */
   const lastEndedReason = ref('')
 
@@ -180,6 +189,9 @@ export const useMeetingStore = defineStore('meeting', () => {
     routerID.value = ''
     participants.value = []
     chatMessages.value = []
+    chatHasMore.value = true
+    chatUnreadCount.value = 0
+    chatHistoryLoaded.value = false
     localAudioEnabled.value = false
     localVideoEnabled.value = false
     localProducers.audio = null
@@ -344,7 +356,22 @@ export const useMeetingStore = defineStore('meeting', () => {
   const _onChatMessage = (msg) => {
     const data = msg.data || {}
     if (!currentRoom.value || data.room_code !== currentRoom.value.room_code) return
-    chatMessages.value.push(data)
+    // WS 广播字段名与 REST 响应不同：id vs message_id；统一映射为 id/user_id/content/created_at
+    const item = {
+      id: data.message_id ?? data.id,
+      user_id: data.user_id,
+      user_name: data.user_name || '',
+      user_avatar: data.user_avatar || '',
+      content: data.content,
+      created_at: data.created_at
+    }
+    // 防止重复：相同 id 已存在则忽略（sendChat 响应 + 广播同时到达的兜底）
+    if (item.id && chatMessages.value.some(m => m.id === item.id)) return
+    chatMessages.value.push(item)
+    const userStore = useUserStore()
+    if (item.user_id !== userStore.userInfo?.id) {
+      chatUnreadCount.value += 1
+    }
   }
 
   /**
@@ -656,16 +683,47 @@ export const useMeetingStore = defineStore('meeting', () => {
 
   // ==================== Actions：聊天/管理 ====================
 
+  /**
+   * 发送会议聊天
+   * 后端广播 meeting.chat.message 给房间内非发送者，发送方依赖 REST 响应里的 message 上屏；
+   * 若后端未把 message 字段回传，则退化为等待广播（不上屏）
+   */
   const sendChat = async (content) => {
     if (!currentRoom.value) throw new Error('未入会')
-    await meetingApi.sendChat(currentRoom.value.room_code, content)
+    const resp = await meetingApi.sendChat(currentRoom.value.room_code, content)
+    const msg = resp?.message
+    if (msg && !chatMessages.value.some(m => m.id === msg.id)) {
+      chatMessages.value.push(msg)
+    }
+    return msg
   }
 
-  const loadChatHistory = async (beforeId = 0, limit = 30) => {
+  /** 加载更早的聊天消息，按 ID 游标向前翻页；首次进入时 beforeId=0 表示拿最新一页 */
+  const loadMoreChats = async (limit = 30) => {
     if (!currentRoom.value) return { list: [], has_more: false }
-    return meetingApi.listChats(currentRoom.value.room_code, { before_id: beforeId, limit })
+    const oldest = chatMessages.value[0]
+    const beforeId = oldest?.id || 0
+    const resp = await meetingApi.listChats(currentRoom.value.room_code, { before_id: beforeId, limit })
+    const list = (resp?.list || []).slice().sort((a, b) => (a.id || 0) - (b.id || 0))
+    if (list.length) {
+      // 去重后按时间序插入到头部
+      const existing = new Set(chatMessages.value.map(m => m.id))
+      const fresh = list.filter(m => !existing.has(m.id))
+      if (fresh.length) chatMessages.value.unshift(...fresh)
+    }
+    chatHasMore.value = !!resp?.has_more
+    chatHistoryLoaded.value = true
+    return resp
   }
 
+  /** 读掉所有会议聊天未读（ChatPanel 打开时调用） */
+  const markChatsRead = () => {
+    chatUnreadCount.value = 0
+  }
+
+  /** 兼容旧调用：保留 loadChatHistory 名称，内部调 loadMoreChats */
+  const loadChatHistory = loadMoreChats
+
   const transferHost = async (targetUserID) => {
     if (!currentRoom.value) throw new Error('未入会')
     await meetingApi.transferHost(currentRoom.value.room_code, targetUserID)
@@ -720,6 +778,9 @@ export const useMeetingStore = defineStore('meeting', () => {
     routerID,
     participants,
     chatMessages,
+    chatHasMore,
+    chatUnreadCount,
+    chatHistoryLoaded,
     lastEndedReason,
     lastAutoHostReason,
     localAudioEnabled,
@@ -751,7 +812,9 @@ export const useMeetingStore = defineStore('meeting', () => {
 
     // chat & admin
     sendChat,
+    loadMoreChats,
     loadChatHistory,
+    markChatsRead,
     transferHost,
     kickMember,
     inviteUsers,