feat(海报检查): 添加海报生成失败状态处理及按钮逻辑

增加海报生成失败状态变量及相应UI反馈
合并保存和重新生成操作为统一处理函数
根据状态显示不同按钮文本和样式

@@ -79,11 +79,11 @@
         </view>
         <view
           class="flex-1 text-white py-3 px-6 rounded-lg font-medium shadow-lg active:scale-95 transition-transform duration-150 flex items-center justify-center gap-2"
-          :class="posterPath ? 'bg-gradient-to-r from-green-400 to-green-500' : 'bg-gray-400'"
-          @click="savePoster"
-          :disabled="!posterPath"
+          :class="posterPath ? 'bg-gradient-to-r from-green-400 to-green-500' : (posterGenerateFailed ? 'bg-gradient-to-r from-orange-400 to-orange-500' : 'bg-gray-400')"
+          @click="handlePosterAction"
+          :disabled="!posterPath && !posterGenerateFailed"
         >
-          <text>保存海报</text>
+          <text>{{ posterPath ? '保存海报' : (posterGenerateFailed ? '重新生成' : '生成中...') }}</text>
         </view>
       </view>
     </view>
@@ -138,6 +138,7 @@ const posterPath = ref('') // 生成的海报路径
 const backgroundImage = ref('') // 用户上传的背景图
 const shouldGeneratePoster = ref(false) // 是否应该生成海报
 const currentPosterIndex = ref(0) // 当前显示的海报索引
+const posterGenerateFailed = ref(false) // 海报生成是否失败
 
 // 页面参数
 const pageParams = ref({
@@ -373,17 +374,11 @@ watch(currentPosterIndex, () => {
 })
 
 /**
- * 返回上一页
- */
-const goBack = () => {
-  Taro.navigateBack()
-}
-
-/**
  * 生成当前海报
  */
 const generateCurrentPoster = () => {
   posterPath.value = ''
+  posterGenerateFailed.value = false
   shouldGeneratePoster.value = false
 
   // 延迟触发生成，确保配置更新
@@ -493,6 +488,7 @@ const uploadBackgroundImage = (filePath) => {
  */
 const onPosterSuccess = (result) => {
   posterPath.value = result.tempFilePath
+  posterGenerateFailed.value = false
   // 更新当前海报的路径
   if (posterList.value[currentPosterIndex.value]) {
     posterList.value[currentPosterIndex.value].path = result.tempFilePath
@@ -506,6 +502,8 @@ const onPosterSuccess = (result) => {
  */
 const onPosterFail = (error) => {
   shouldGeneratePoster.value = false
+  posterGenerateFailed.value = true
+  posterPath.value = ''
   Taro.showToast({ title: '海报生成失败', icon: 'none' })
   console.error('海报生成失败:', error)
 }
@@ -530,6 +528,19 @@ const closePreview = () => {
 }
 
 /**
+ * 处理海报按钮点击事件
+ */
+const handlePosterAction = () => {
+  if (posterPath.value) {
+    // 如果海报已生成，执行保存操作
+    savePoster()
+  } else if (posterGenerateFailed.value) {
+    // 如果生成失败，重新生成海报
+    generateCurrentPoster()
+  }
+}
+
+/**
  * 保存海报到相册
  */
 const savePoster = () => {