feat(ui): 添加播客生成失败重试功能

添加了播客生成失败后的重试功能，包括：
- 在播客卡片中显示失败状态和重试按钮
- 保存失败任务的输入文本内容以便重试
- 实现重试事件系统，将失败内容回填到创建组件
- 更新多语言支持中的失败和重试文本

同时修复了TTS配置中的语音名称错误，调整了遮罩层透明度，
并改进了路径获取逻辑以处理根路径情况。

web/public/locales/en/components.json

@@ -53,8 +53,10 @@
   "podcastCard": {
     "podcastGenerationQueued": "Podcast generation queued...",
     "podcastGenerating": "Podcast generating...",
+    "podcastGenerationFailed": "Podcast generation failed",
     "moreOperations": "More operations",
-    "mostPopular": "Most Popular"
+    "mostPopular": "Most Popular",
+    "retry": "Retry"
   },
   "podcastContent": {
     "speaker": "Speaker",

web/public/locales/ja/components.json

@@ -53,8 +53,10 @@
   "podcastCard": {
     "podcastGenerationQueued": "ポッドキャスト生成キューに追加されました...",
     "podcastGenerating": "ポッドキャスト生成中...",
+    "podcastGenerationFailed": "ポッドキャスト生成に失敗しました",
     "moreOperations": "その他の操作",
-    "mostPopular": "最も人気"
+    "mostPopular": "最も人気",
+    "retry": "再試行"
   },
   "podcastContent": {
     "speaker": "スピーカー",

web/public/locales/zh-CN/components.json

@@ -53,8 +53,10 @@
   "podcastCard": {
     "podcastGenerationQueued": "播客生成排队中...",
     "podcastGenerating": "播客生成中...",
+    "podcastGenerationFailed": "播客生成失败",
     "moreOperations": "更多操作",
-    "mostPopular": "最受欢迎"
+    "mostPopular": "最受欢迎",
+    "retry": "重试"
   },
   "podcastContent": {
     "speaker": "说话人",