feat(mini-program): sendChat 按 generationPhase 切换接口，消息进统一对话流

mini-program/src/pages/main/ScriptView.vue

@@ -611,6 +611,10 @@ const sendChat = async () => {
   if (!chatInput.value.trim() || generating.value) return
   const content = chatInput.value.trim()
   chatInput.value = ''
+
+  // 仅在 generationPhase === 'done' 时处理；生成流程中底部输入栏不显示，但防御性 short-circuit
+  if (generationPhase.value !== 'done') return
+
   const messageId = currentVersionMessageId.value
 
   const userMessageRes = await createMessage({
@@ -622,15 +626,21 @@ const sendChat = async () => {
   })
   const userMessageId = userMessageRes.data?.id
 
-  messages.value.push({
-    id: userMessageId,
-    conversationId: conversationId.value,
+  // 用户消息追加到统一对话流 resultMessages
+  resultMessages.value.push({
+    id: userMessageId || createMessageId(),
+    role: 'user',
+    kind: 'text',
     content,
-    sender: 'user',
-    type: 'chat'
+    pending: false,
+    time: formatMessageTime(),
+    submitted: false,
+    confirmed: false
   })
+  keepResultAtBottom()
 
   generating.value = true
+  generationStatus.value = 'streaming'
   await streamScriptChat({
     operationType: 'chat',
     conversationId: conversationId.value,
@@ -638,13 +648,21 @@ const sendChat = async () => {
     userMessageId,
     content,
     scriptId: scriptId.value,
-    onDelta: () => {},
+    onDelta: (delta) => {
+      // 往最后一条 AI 小说消息追加 delta
+      const lastAssistant = [...resultMessages.value].reverse().find(m => m.role === 'assistant' && m.kind === 'novel')
+      if (lastAssistant) {
+        lastAssistant.content += delta
+      }
+    },
     onDone: () => {
       generating.value = false
+      generationStatus.value = 'idle'
       loadMessages()
     },
     onError: (error) => {
       generating.value = false
+      generationStatus.value = 'idle'
       uni.showToast({ title: error || '生成失败', icon: 'none' })
     }
   })