优化: CR-08 i18n batch2全量(ProjectDetail5处+TaskDetail16key+AiChat3处+store error fallback 23处+useAiSend 3处)+@/i18n路径统一+vite别名

src/i18n/zh-CN/ideas.ts

@@ -76,5 +76,11 @@ export default {
     confirmDelete: '确定删除灵感「{title}」?此操作不可撤销。',
     promoteFailed: '立项失败',
     evalFailed: '评估失败',
+    // 错误回退(state.error 用户可见)
+    err: {
+      loadFailed: '加载灵感失败',
+      createFailed: '创建灵感失败',
+      deleteFailed: '删除灵感失败',
+    },
   },
 }