fix(mini-program): 修复心愿实现页用户消息不显示 + 支持继续会话

1. runGeneration 补赋值 generationDisplayText，修复用户输入心愿不显示
2. 识别外部服务 DAILY_GENERATION_IN_PROGRESS 错误码，保存 session_id
3. 失败态新增'继续创作'按钮，调用 followup action=retry 恢复中断会话
4. 新增 resumeSession 方法，重置状态后恢复流式生成

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

@@ -173,7 +173,8 @@
       <text class="loading-copy">{{ generationCopy }}</text>
       <text v-if="generationStatus !== 'failed'" class="loading-subcopy">{{ generationSubcopy }}</text>
       <view v-else class="generation-actions">
-        <button class="generation-action primary" @click="retryGeneration">再试一次</button>
+        <button v-if="resumeableSessionId" class="generation-action primary" @click="resumeSession">继续创作</button>
+        <button v-else class="generation-action primary" @click="retryGeneration">再试一次</button>
         <button class="generation-action secondary" @click="returnToEdit">返回修改</button>
       </view>
       </view>
@@ -346,6 +347,7 @@ const generationScrollTarget = ref('')
 const generationScrollTop = ref(0)
 const generationAutoFollow = ref(true)
 const generationDisplayText = ref('')
+const resumeableSessionId = ref('')
 const lastGenerationPrompt = ref('')
 const lastSubmitSource = ref('text')
 const lastGenerationRevision = ref(false)
@@ -1641,7 +1643,9 @@ const runGeneration = async ({ prompt, displayText, source = 'text', saveTheme }
   novelOutline.value = null
   clarificationCard.value = null
   novelSessionId.value = ''
+  resumeableSessionId.value = ''
   outlineFeedback.value = ''
+  generationDisplayText.value = display
   generationScrollTarget.value = ''
   generationScrollTop.value = 0
   generationScrollAnchor.value = 'generation-stream-anchor-a'
@@ -1709,7 +1713,13 @@ const handleShortNovelEvent = (event) => {
       viewMode.value = 'chat'
       break
     case 'error':
-      markGenerationFailed(payload.message || '生成失败')
+      // 识别每日限制错误，保存 session_id 供"继续创作"使用
+      if (payload.code === 'DAILY_GENERATION_IN_PROGRESS' && session_id) {
+        resumeableSessionId.value = session_id
+        markGenerationFailed(payload.message || '今天已有未完成的创作，可点击继续创作恢复')
+      } else {
+        markGenerationFailed(payload.message || '生成失败')
+      }
       break
   }
 }
@@ -1748,6 +1758,42 @@ const modifyOutline = (feedback) => {
   })
 }
 
+const resumeSession = () => {
+  if (!resumeableSessionId.value || generating.value) return
+  novelSessionId.value = resumeableSessionId.value
+  resumeableSessionId.value = ''
+  generating.value = true
+  streamContent.value = ''
+  novelFullText.value = ''
+  generationStatus.value = 'waiting'
+  generationError.value = ''
+  generationDisplayText.value = '继续之前的创作'
+  streamWriter.reset()
+  startGenerationFeedback()
+  viewState.value = 'generating'
+  keepGenerationAtBottom()
+
+  try {
+    currentStreamTask.value = followupStream({
+      sessionId: novelSessionId.value,
+      action: 'retry',
+      payload: null,
+      onEvent: handleShortNovelEvent,
+      onError: (msg) => {
+        markGenerationFailed(msg)
+        analytics.track('script_generate_fail', {
+          source: 'resume',
+          error: msg
+        }, { eventType: 'script', pagePath })
+      }
+    })
+  } catch (error) {
+    markGenerationFailed(error.message || '恢复失败')
+  } finally {
+    generating.value = false
+  }
+}
+
 const submitWish = async (source = 'text') => {
   const text = wishText.value.trim()
   if (!text || generating.value) return