diff --git a/dashboard/src/App.vue b/dashboard/src/App.vue
index 07033b6..5256da6 100644
--- a/dashboard/src/App.vue
+++ b/dashboard/src/App.vue
@@ -1,8 +1,13 @@
 <script setup>
 import { useAuth } from './utils/useAuth.js'
 import AppHeader from './components/AppHeader.vue'
+import { useRouter } from 'vue-router'
 
 const { isLoggedIn } = useAuth()
+const router = useRouter()
+
+// 设置全局 router 引用，供 api.js 响应拦截器使用
+window.__VUE_ROUTER__ = router
 </script>
 
 <template>
diff --git a/dashboard/src/components/MessageBubble.vue b/dashboard/src/components/MessageBubble.vue
index e85fe1a..8ffb914 100644
--- a/dashboard/src/components/MessageBubble.vue
+++ b/dashboard/src/components/MessageBubble.vue
@@ -157,12 +157,11 @@ const regenerateIcon = `<svg viewBox="0 0 24 24" width="14" height="14" fill="no
   display: flex;
   align-items: center;
   gap: 10px;
-  padding: 8px 0 0;
+  margin-top: 8px;
+  padding-top: 10px;
   font-size: 12px;
   color: var(--text-tertiary);
   border-top: 1px solid transparent;
-  margin-top: 8px;
-  padding-top: 10px;
 }
 
 
diff --git a/dashboard/src/components/room/RoomSidebar.vue b/dashboard/src/components/room/RoomSidebar.vue
index 0d407ae..8ed7f29 100644
--- a/dashboard/src/components/room/RoomSidebar.vue
+++ b/dashboard/src/components/room/RoomSidebar.vue
@@ -194,8 +194,9 @@ function handleBack() {
     <div v-if="sidebarTab === 'roomAgents' && room" class="sidebar-tab-content">
       <div class="sidebar-header sidebar-header-row">
         <button class="btn-back" @click="handleBack">
-          <svg width="18" height="18">
-            <use href="#arrow-left-icon"/>
+          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+            <line x1="19" y1="12" x2="5" y2="12"></line>
+            <polyline points="12 19 5 12 12 5"></polyline>
           </svg>
         </button>
         <span class="sidebar-title">{{ room.title }}</span>
diff --git a/dashboard/src/utils/api.js b/dashboard/src/utils/api.js
index b68af6d..70749d8 100644
--- a/dashboard/src/utils/api.js
+++ b/dashboard/src/utils/api.js
@@ -30,7 +30,12 @@ api.interceptors.response.use(
     if (error.response?.status === 401) {
       localStorage.removeItem('access_token')
       localStorage.removeItem('user')
-      window.location.href = '/auth'
+      // 使用 Vue Router 跳转，避免 SPA 路由丢失
+      if (window.__VUE_ROUTER__) {
+        window.__VUE_ROUTER__.push('/auth')
+      } else {
+        window.location.href = '/auth'
+      }
     }
     return Promise.reject(error.response?.data || error.message)
   }
@@ -106,6 +111,7 @@ export const chatRoomsAPI = {
   delete: (id) => api.delete(`/chat-rooms/${id}`),
   getMessages: (id) => api.get(`/chat-rooms/${id}/messages`),
   start: (id) => `/api/chat-rooms/${id}/start`,
+  // 注意: start 返回路径字符串，由调用方使用 fetch 处理 SSE 流
   stop: (id) => api.post(`/chat-rooms/${id}/stop`),
   reset: (id) => api.post(`/chat-rooms/${id}/reset`),
   addAgent: (roomId, data) => api.post(`/chat-rooms/${roomId}/agents`, data),
diff --git a/dashboard/src/utils/parallelStreamManager.js b/dashboard/src/utils/parallelStreamManager.js
index 638d48b..ba690d4 100644
--- a/dashboard/src/utils/parallelStreamManager.js
+++ b/dashboard/src/utils/parallelStreamManager.js
@@ -108,24 +108,24 @@ class ParallelStreamManager {
         break
         
       case 'message_start':
-        store.startAgentStream(roomId, data.agent_id || data.agentId, data)
+        store.startAgentStream(roomId, data.agent_id, data)
         break
         
       case 'message_chunk':
-        store.updateAgentContent(roomId, data.agent_id || data.agentId, {
+        store.updateAgentContent(roomId, data.agent_id, {
           content: data.content || '',
           progress: data.progress || 0
         })
         break
         
       case 'message_end':
-        store.completeAgentStream(roomId, data.agent_id || data.agentId, data)
+        store.completeAgentStream(roomId, data.agent_id, data)
         break
         
       case 'agent_error':
-        store.errorAgentStream(roomId, data.agent_id || data.agentId, {
+        store.errorAgentStream(roomId, data.agent_id, {
           message: data.error,
-          agentName: data.agent_name || data.agentName
+          agentName: data.agent_name
         })
         break
         
diff --git a/dashboard/src/utils/useConversations.js b/dashboard/src/utils/useConversations.js
index fbb48b9..d6d68d3 100644
--- a/dashboard/src/utils/useConversations.js
+++ b/dashboard/src/utils/useConversations.js
@@ -102,8 +102,8 @@ export function useConversations() {
         convMessages.value = res.data?.messages || []
         // 加载完成后强制滚动到底部（初始加载总是显示最新消息）
         nextTick(() => {
-          if (typeof onInitialScroll === 'function') {
-            onInitialScroll()
+          if (typeof initialScrollCallback === 'function') {
+            initialScrollCallback()
           }
         })
       }
@@ -278,10 +278,10 @@ export function useConversations() {
   }
   
   // 初始滚动回调（由外部设置）
-  let onInitialScroll = null
+  let initialScrollCallback = null
   
   const setOnInitialScroll = (callback) => {
-    onInitialScroll = callback
+    initialScrollCallback = callback
   }
   
   return {
diff --git a/dashboard/src/views/ConversationView.vue b/dashboard/src/views/ConversationView.vue
index 36daa37..b1e76cd 100644
--- a/dashboard/src/views/ConversationView.vue
+++ b/dashboard/src/views/ConversationView.vue
@@ -94,21 +94,23 @@
             </div>
           </div>
           <div class="chat-input-area">
-            <input 
-              v-model="newMessage" 
-              @keyup.enter="handleSend" 
-              type="text" 
-              placeholder="输入消息..." 
-              class="chat-input" 
-              :disabled="sending"
-            />
-            <button @click="handleSend" class="btn-send" :disabled="sending || !newMessage.trim()" title="发送">
-              <svg v-if="!sending" viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                <line x1="22" y1="2" x2="11" y2="13"></line>
-                <polygon points="22 2 15 22 11 13 2 9 22 2"></polygon>
-              </svg>
-              <span v-else>...</span>
-            </button>
+            <div class="input-wrapper">
+              <textarea 
+                v-model="newMessage" 
+                @keydown.enter.exact.prevent="handleSend"
+                placeholder="输入消息... (Shift+Enter 换行)" 
+                class="chat-input" 
+                :disabled="sending"
+                rows="3"
+              ></textarea>
+              <button @click="handleSend" class="btn-send" :disabled="sending || !newMessage.trim()" title="发送">
+                <svg v-if="!sending" viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                  <line x1="22" y1="2" x2="11" y2="13"></line>
+                  <polygon points="22 2 15 22 11 13 2 9 22 2"></polygon>
+                </svg>
+                <span v-else>...</span>
+              </button>
+            </div>
           </div>
         </div>
       </main>
@@ -424,10 +426,51 @@ onUnmounted(() => {
 .loading-messages .spinner-small { margin-bottom: 0.5rem; }
 
 /* 聊天输入区 */
-.chat-input-area { padding: 1rem; border-top: 1px solid var(--border-light); display: flex; gap: 0.75rem; }
-.chat-input { flex: 1; padding: 0.65rem 0.9rem; border: 1px solid var(--border-input); border-radius: 8px; background: var(--bg-input); color: var(--text-primary); font-size: 0.9rem; }
-.chat-input:focus { outline: none; border-color: var(--accent-primary); }
-.btn-send { width: 40px; height: 40px; background: var(--accent-primary); color: white; border: none; border-radius: 8px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s ease; }
+.chat-input-area { padding: 1rem; border-top: 1px solid var(--border-light); }
+.input-wrapper { 
+  position: relative; 
+  display: flex; 
+  background: var(--bg-input); 
+  border: 1px solid var(--border-input); 
+  border-radius: 10px; 
+  transition: border-color 0.2s ease;
+}
+.input-wrapper:focus-within { border-color: var(--accent-primary); }
+.chat-input { 
+  flex: 1; 
+  padding: 0.75rem 3rem 0.75rem 1rem; 
+  border: none; 
+  background: transparent; 
+  color: var(--text-primary); 
+  font-size: 0.9rem; 
+  font-family: inherit;
+  resize: none;
+  min-height: 72px;
+  max-height: 200px;
+  overflow-y: auto;
+  line-height: 1.5;
+  white-space: pre-wrap;
+  word-break: break-word;
+  box-sizing: border-box;
+}
+.chat-input:focus { outline: none; }
+.chat-input:disabled { opacity: 0.6; }
+.btn-send { 
+  position: absolute; 
+  right: 8px; 
+  bottom: 8px; 
+  width: 36px; 
+  height: 36px; 
+  background: var(--accent-primary); 
+  color: white; 
+  border: none; 
+  border-radius: 8px; 
+  cursor: pointer; 
+  display: flex; 
+  align-items: center; 
+  justify-content: center; 
+  transition: all 0.15s ease; 
+}
 .btn-send:hover:not(:disabled) { background: var(--accent-primary-hover); transform: translateY(-1px); box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3); }
 .btn-send:disabled { opacity: 0.5; cursor: not-allowed; }