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/en/knowledge.ts

@@ -74,5 +74,17 @@ export default {
       deployment_note: 'Deployment Note',
       workflow_optimization: 'Workflow Optimization',
     },
+    // Error fallbacks (user-visible via state.error)
+    err: {
+      loadFailed: 'Failed to load knowledge base',
+      loadInboxFailed: 'Failed to load inbox',
+      searchFailed: 'Search failed',
+      createFailed: 'Failed to create knowledge',
+      updateStatusFailed: 'Failed to update status',
+      archiveFailed: 'Failed to archive',
+      loadConfigFailed: 'Failed to load config',
+      saveConfigFailed: 'Failed to save config',
+      extractFailed: 'Extraction failed',
+    },
   },
 }