fix: 心愿实现页面用 pendingNextResponse 标志修复第二轮 loading 显示

- 新增 pendingNextResponse ref 标志等待下一个 assistant 响应
- showChatLoading 改用该标志判断，替代不可靠的最后消息 role 判断
- submitClarification 移除重复 addResultMessage，消除重复用户气泡
- 规避 mp-weixin 对 v-for 中 computed 数组的错误编译导致的页面空白
- runGeneration/clarification/outline/novel_start/novel_done 正确设置标志

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -114,7 +114,7 @@
 
           <view class="conversation compact">
             <view
-              v-for="(msg, idx) in filteredResultMessages"
+              v-for="msg in resultMessages"
               :key="msg.id"
             >
               <view v-if="msg.role === 'user' && msg.kind === 'text'" class="chat-bubble user">
@@ -293,6 +293,8 @@ const novelOutline = ref(null)
 const clarificationCard = ref(null)
 const currentStreamTask = ref(null)
 const answeringClarification = ref(false)
+// 等待下一个 assistant 响应（包括 followupStream 的所有响应）
+const pendingNextResponse = ref(false)
 const outlineFeedback = ref('')
 const messages = ref([])
 const versions = ref([])
@@ -944,36 +946,12 @@ const generationCopy = computed(() => {
 
 // chat 视图 loading 显示条件：等待首个 assistant 响应期间
 // - generationPhase === 'generating'：生成流程未完成
-// 渲染层过滤：去掉"紧跟在已提交 card 后、内容等于 card.answer"的 user 消息，避免重复气泡
-// 注意：showChatLoading 必须用原始 resultMessages 判定（不能用 filteredResultMessages，否则永远 false）
-const filteredResultMessages = computed(() => {
-  const list = resultMessages.value
-  if (!list || list.length < 2) return list
-  return list.filter((m, idx) => {
-    if (!(m.role === 'user' && m.kind === 'text')) return true
-    // 向前查找最近的 card 消息
-    for (let i = idx - 1; i >= 0; i--) {
-      const prev = list[i]
-      if (prev.kind === 'card') {
-        // 是已提交 card 且内容相同 → 过滤
-        if (prev.submitted && prev.answer && m.content === prev.answer) return false
-        return true
-      }
-    }
-    return true
-  })
-})
-
 // - generationStatus !== 'failed'：非失败状态
-// - 最后一条消息是 user：说明还没收到 assistant 响应（card/outline/novel）
-// 注意：使用原始 resultMessages 判定，不能用 filteredResultMessages（会被过滤掉导致永远 false）
+// - pendingNextResponse：用户刚发完请求（心愿或澄清答案），等待下一个 assistant 响应
 const showChatLoading = computed(() => {
   if (generationPhase.value !== 'generating') return false
   if (generationStatus.value === 'failed') return false
-  const list = resultMessages.value
-  if (!list || !list.length) return false
-  const lastMsg = list[list.length - 1]
-  return lastMsg && lastMsg.role === 'user'
+  return pendingNextResponse.value === true
 })
 
 const generationSubcopy = computed(() => {
@@ -1668,6 +1646,7 @@ const runGeneration = async ({ prompt, displayText, source = 'text', saveTheme }
   novelOutline.value = null
   clarificationCard.value = null
   novelSessionId.value = ''
+  pendingNextResponse.value = true  // 标记等待下一个 assistant 响应
   resumeableSessionId.value = ''
   outlineFeedback.value = ''
   generationDisplayText.value = display
@@ -1719,14 +1698,17 @@ const handleShortNovelEvent = (event) => {
     case 'clarification_card':
       addResultMessage({ role: 'assistant', kind: 'card', card: payload.card || null })
       generationStatus.value = 'idle'
+      pendingNextResponse.value = false
       break
     case 'outline_created':
       addResultMessage({ role: 'assistant', kind: 'outline', outline: payload.outline || null })
       generationStatus.value = 'idle'
+      pendingNextResponse.value = false
       break
     case 'novel_start':
       addResultMessage({ role: 'assistant', kind: 'novel', content: '', pending: true })
       generationStatus.value = 'streaming'
+      pendingNextResponse.value = false
       break
     case 'novel_delta': {
       // 往最后一条 novel 消息追加 delta
@@ -1749,6 +1731,7 @@ const handleShortNovelEvent = (event) => {
       currentVersionMessageId.value = payload.currentVersionMessageId || ''
       generationPhase.value = 'done'
       generationStatus.value = 'idle'
+      pendingNextResponse.value = false
       persistResultMessages()
       break
     }
@@ -1774,9 +1757,9 @@ const submitClarification = (answer) => {
   const label = option?.label || answer
   if (card) {
     card.submitted = true
-    card.answer = label  // 显示用 label（中文）；答案已在卡片中显示，但同时添加 user 消息让 loading 能正确判断等待状态
+    card.answer = label  // 显示用 label（中文）；答案已在卡片中显示，无需额外用户气泡
   }
-  addResultMessage({ role: 'user', kind: 'text', content: label })
+  pendingNextResponse.value = true  // 标记等待下一个 assistant 响应
   answeringClarification.value = true
   currentStreamTask.value = followupStream({
     sessionId: novelSessionId.value,