feat: 优化聊天界面布局与交互

backend/routes/messages.py

@@ -73,3 +73,33 @@ def delete_message(conv_id, msg_id):
     db.session.delete(msg)
     db.session.commit()
     return ok(message="deleted")
+
+
+@bp.route("/api/conversations/<conv_id>/regenerate/<msg_id>", methods=["POST"])
+def regenerate_message(conv_id, msg_id):
+    """Regenerate an assistant message"""
+    conv = db.session.get(Conversation, conv_id)
+    if not conv:
+        return err(404, "conversation not found")
+
+    # 获取要重新生成的消息
+    msg = db.session.get(Message, msg_id)
+    if not msg or msg.conversation_id != conv_id:
+        return err(404, "message not found")
+
+    if msg.role != "assistant":
+        return err(400, "can only regenerate assistant messages")
+
+    # 删除该消息及其后面的所有消息
+    Message.query.filter(
+        Message.conversation_id == conv_id,
+        Message.created_at >= msg.created_at
+    ).delete(synchronize_session=False)
+    db.session.commit()
+
+    # 获取工具启用状态
+    d = request.json or {}
+    tools_enabled = d.get("tools_enabled", True)
+
+    # 流式重新生成
+    return _chat_service.stream_response(conv, tools_enabled)

frontend/src/App.vue

@@ -25,6 +25,7 @@
       :tools-enabled="toolsEnabled"
       @send-message="sendMessage"
       @delete-message="deleteMessage"
+      @regenerate-message="regenerateMessage"
       @toggle-settings="showSettings = true"
       @load-more-messages="loadMoreMessages"
       @toggle-tools="updateToolsEnabled"
@@ -359,6 +360,99 @@ async function deleteMessage(msgId) {
   }
 }
 
+// -- Regenerate message --
+async function regenerateMessage(msgId) {
+  if (!currentConvId.value || streaming.value) return
+
+  const convId = currentConvId.value
+
+  // 找到要重新生成的消息索引
+  const msgIndex = messages.value.findIndex(m => m.id === msgId)
+  if (msgIndex === -1) return
+
+  // 移除该消息及其后面的所有消息
+  messages.value = messages.value.slice(0, msgIndex)
+
+  streaming.value = true
+  streamContent.value = ''
+  streamThinking.value = ''
+  streamToolCalls.value = []
+  streamProcessSteps.value = []
+
+  currentStreamPromise = messageApi.regenerate(convId, msgId, {
+    toolsEnabled: toolsEnabled.value,
+    onThinkingStart() {
+      if (currentConvId.value === convId) {
+        streamThinking.value = ''
+      }
+    },
+    onThinking(text) {
+      if (currentConvId.value === convId) {
+        streamThinking.value += text
+      }
+    },
+    onMessage(text) {
+      if (currentConvId.value === convId) {
+        streamContent.value += text
+      }
+    },
+    onToolCalls(calls) {
+      if (currentConvId.value === convId) {
+        streamToolCalls.value.push(...calls.map(c => ({ ...c, result: null })))
+      }
+    },
+    onToolResult(result) {
+      if (currentConvId.value === convId) {
+        const call = streamToolCalls.value.find(c => c.id === result.id)
+        if (call) call.result = result.content
+      }
+    },
+    onProcessStep(step) {
+      const idx = step.index
+      if (currentConvId.value === convId) {
+        const newSteps = [...streamProcessSteps.value]
+        while (newSteps.length <= idx) {
+          newSteps.push(null)
+        }
+        newSteps[idx] = step
+        streamProcessSteps.value = newSteps
+      }
+    },
+    async onDone(data) {
+      if (currentConvId.value === convId) {
+        streaming.value = false
+        currentStreamPromise = null
+        messages.value.push({
+          id: data.message_id,
+          conversation_id: convId,
+          role: 'assistant',
+          content: streamContent.value,
+          token_count: data.token_count,
+          thinking_content: streamThinking.value || null,
+          tool_calls: streamToolCalls.value.length > 0 ? streamToolCalls.value : null,
+          process_steps: streamProcessSteps.value.filter(Boolean),
+          created_at: new Date().toISOString(),
+        })
+        streamContent.value = ''
+        streamThinking.value = ''
+        streamToolCalls.value = []
+        streamProcessSteps.value = []
+      }
+    },
+    onError(msg) {
+      if (currentConvId.value === convId) {
+        streaming.value = false
+        currentStreamPromise = null
+        streamContent.value = ''
+        streamThinking.value = ''
+        streamToolCalls.value = []
+        streamProcessSteps.value = []
+        console.error('Regenerate error:', msg)
+      }
+    },
+  })
+}
+
 // -- Delete conversation --
 async function deleteConversation(id) {
   try {

frontend/src/api/index.js

@@ -172,4 +172,71 @@ export const messageApi = {
   delete(convId, msgId) {
     return request(`/conversations/${convId}/messages/${msgId}`, { method: 'DELETE' })
   },
+
+  regenerate(convId, msgId, { toolsEnabled = true, onThinkingStart, onThinking, onMessage, onToolCalls, onToolResult, onProcessStep, onDone, onError } = {}) {
+    const controller = new AbortController()
+
+    const promise = (async () => {
+      try {
+        const res = await fetch(`${BASE}/conversations/${convId}/regenerate/${msgId}`, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ tools_enabled: toolsEnabled }),
+          signal: controller.signal,
+        })
+
+        if (!res.ok) {
+          const err = await res.json().catch(() => ({}))
+          throw new Error(err.message || `HTTP ${res.status}`)
+        }
+
+        const reader = res.body.getReader()
+        const decoder = new TextDecoder()
+        let buffer = ''
+
+        while (true) {
+          const { done, value } = await reader.read()
+          if (done) break
+
+          buffer += decoder.decode(value, { stream: true })
+          const lines = buffer.split('\n')
+          buffer = lines.pop() || ''
+
+          let currentEvent = ''
+          for (const line of lines) {
+            if (line.startsWith('event: ')) {
+              currentEvent = line.slice(7).trim()
+            } else if (line.startsWith('data: ')) {
+              const data = JSON.parse(line.slice(6))
+              if (currentEvent === 'thinking_start' && onThinkingStart) {
+                onThinkingStart()
+              } else if (currentEvent === 'thinking' && onThinking) {
+                onThinking(data.content)
+              } else if (currentEvent === 'message' && onMessage) {
+                onMessage(data.content)
+              } else if (currentEvent === 'tool_calls' && onToolCalls) {
+                onToolCalls(data.calls)
+              } else if (currentEvent === 'tool_result' && onToolResult) {
+                onToolResult(data)
+              } else if (currentEvent === 'process_step' && onProcessStep) {
+                onProcessStep(data)
+              } else if (currentEvent === 'done' && onDone) {
+                onDone(data)
+              } else if (currentEvent === 'error' && onError) {
+                onError(data.content)
+              }
+            }
+          }
+        }
+      } catch (e) {
+        if (e.name !== 'AbortError' && onError) {
+          onError(e.message)
+        }
+      }
+    })()
+
+    promise.abort = () => controller.abort()
+
+    return promise
+  },
 }

frontend/src/components/ChatView.vue

@@ -44,6 +44,7 @@
             :created-at="msg.created_at"
             :deletable="msg.role === 'user'"
             @delete="$emit('deleteMessage', msg.id)"
+            @regenerate="$emit('regenerateMessage', msg.id)"
           />
 
           <div v-if="streaming" class="message-bubble assistant streaming">
@@ -98,7 +99,7 @@ const props = defineProps({
   toolsEnabled: { type: Boolean, default: true },
 })
 
-defineEmits(['sendMessage', 'deleteMessage', 'toggleSettings', 'loadMoreMessages', 'toggleTools'])
+defineEmits(['sendMessage', 'deleteMessage', 'regenerateMessage', 'toggleSettings', 'loadMoreMessages', 'toggleTools'])
 
 const scrollContainer = ref(null)
 const inputRef = ref(null)
@@ -142,13 +143,12 @@ defineExpose({ scrollToBottom })
 
 <style scoped>
 .chat-view {
-  flex: 1;
+  flex: 1 1 auto;            /* 弹性宽度，自动填充剩余空间 */
   display: flex;
   flex-direction: column;
   height: 100vh;
   background: var(--bg-secondary);
-  min-width: 0;
+  min-width: 300px;          /* 最小宽度保证可用性 */
-  max-width: 100%;
   overflow: hidden;
   transition: background 0.2s;
 }
@@ -255,10 +255,12 @@ defineExpose({ scrollToBottom })
 }
 
 .messages-container {
-  flex: 1;
+  flex: 1 1 auto;          /* 弹性高度，自动填充 */
   overflow-y: auto;
-  padding: 0 24px;
+  padding: 16px 0;
   width: 100%;
+  display: flex;
+  flex-direction: column;
 }
 
 .messages-container::-webkit-scrollbar {
@@ -292,8 +294,10 @@ defineExpose({ scrollToBottom })
 }
 
 .messages-list {
-  max-width: 800px;
+  flex: 0 1 auto;           /* 弹性宽度 */
-  margin: 0 auto;
+  width: 80%;
+  margin: 0 auto;           /* 居中显示 */
+  padding: 0 16px;          /* 左右内边距 */
 }
 
 .message-bubble {
@@ -301,6 +305,30 @@ defineExpose({ scrollToBottom })
   gap: 12px;
   padding: 0;
   margin-bottom: 16px;
+  width: 100%;
+}
+
+.message-bubble.assistant {
+  width: 100%;
+}
+
+.message-bubble.assistant.streaming {
+  width: 100%;
+}
+
+.message-bubble .message-container {
+  display: flex;
+  flex-direction: column;
+  max-width: 85%;
+  min-width: 200px;
+}
+
+.message-bubble.user .message-container {
+  align-items: flex-end;
+}
+
+.message-bubble.assistant .message-container {
+  align-items: flex-start;
 }
 
 .message-bubble .avatar {
@@ -329,6 +357,10 @@ defineExpose({ scrollToBottom })
   transition: background 0.2s, border-color 0.2s;
 }
 
+.message-bubble.streaming .message-body {
+  flex: 1;
+}
+
 .streaming-content {
   font-size: 15px;
   line-height: 1.7;

frontend/src/components/MessageBubble.vue

@@ -2,6 +2,7 @@
   <div class="message-bubble" :class="[role]">
     <div v-if="role === 'user'" class="avatar">user</div>
     <div v-else class="avatar">claw</div>
+    <div class="message-container">
       <div class="message-body">
         <ProcessBlock
           v-if="thinkingContent || (toolCalls && toolCalls.length > 0) || (processSteps && processSteps.length > 0)"
@@ -14,9 +15,16 @@
           <pre>{{ content }}</pre>
         </div>
         <div v-else class="message-content" v-html="renderedContent"></div>
+      </div>
       <div class="message-footer">
         <span class="token-count" v-if="tokenCount">{{ tokenCount }} tokens</span>
         <span class="message-time">{{ formatTime(createdAt) }}</span>
+        <button v-if="role === 'assistant'" class="btn-regenerate" @click="$emit('regenerate')" title="重新生成">
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <path d="M1 4v6h6"/>
+            <path d="M3.51 15a9 9 0 1 0 2.13-9.36L1 10"/>
+          </svg>
+        </button>
         <button v-if="role === 'assistant'" class="btn-copy" @click="copyContent" title="复制">
           <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
             <rect x="9" y="9" width="13" height="13" rx="2" ry="2"></rect>
@@ -51,7 +59,7 @@ const props = defineProps({
   deletable: { type: Boolean, default: false },
 })
 
-defineEmits(['delete'])
+defineEmits(['delete', 'regenerate'])
 
 const renderedContent = computed(() => {
   if (!props.content) return ''
@@ -74,12 +82,36 @@ function copyContent() {
   gap: 12px;
   padding: 0;
   margin-bottom: 16px;
+  width: 100%;
 }
 
 .message-bubble.user {
   flex-direction: row-reverse;
 }
 
+.message-container {
+  display: flex;
+  flex-direction: column;
+  min-width: 200px;
+  width: 100%;
+}
+
+.message-bubble.user .message-container {
+  align-items: flex-end;
+  width: fit-content;
+  max-width: 85%;
+}
+
+.message-bubble.assistant .message-container {
+  align-items: flex-start;
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+.message-bubble.assistant .message-body {
+  width: 100%;
+}
+
 .avatar {
   width: 32px;
   height: 32px;
@@ -228,13 +260,8 @@ function copyContent() {
   display: flex;
   align-items: center;
   gap: 8px;
-  margin-top: 8px;
+  padding: 6px 0 0;
-  opacity: 0;
+  font-size: 12px;
-  transition: opacity 0.15s;
-}
-
-.message-bubble:hover .message-footer {
-  opacity: 1;
 }
 
 .token-count,
@@ -243,6 +270,7 @@ function copyContent() {
   color: var(--text-tertiary);
 }
 
+.btn-regenerate,
 .btn-copy,
 .btn-delete-msg {
   background: none;
@@ -256,6 +284,11 @@ function copyContent() {
   align-items: center;
 }
 
+.btn-regenerate:hover {
+  color: var(--success-color);
+  background: var(--success-bg);
+}
+
 .btn-copy:hover {
   color: var(--accent-primary);
   background: var(--accent-primary-light);

frontend/src/components/Sidebar.vue

@@ -73,14 +73,16 @@ function onContextMenu(e, conv) {
 
 <style scoped>
 .sidebar {
-  width: 280px;
+  flex: 0 1 auto;            /* 弹性宽度，可收缩 */
-  min-width: 280px;
+  width: 260px;              /* 默认宽度 */
+  min-width: 180px;          /* 最小宽度 */
+  max-width: 320px;          /* 最大宽度 */
   background: var(--bg-primary);
   border-right: 1px solid var(--border-medium);
   display: flex;
   flex-direction: column;
   height: 100vh;
-  transition: background 0.2s, border-color 0.2s;
+  transition: all 0.2s;
 }
 
 .sidebar-header {