fix(sync,rag): keep restored rows, reconcile after tombstone pruning, reject partial knowledge docs, surface RAG indexing failures

apps/desktop/src/renderer/pages/KnowledgeBasePage.tsx

@@ -11,6 +11,7 @@ import { isImeComposingEvent } from '../utils/keyboard'
 import { d3roPalette, d3roFontSans, d3roTypo, d3roRadius, d3roShadow } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
 import type { RAGDocument, RAGQueryResult, RAGIndexProgress } from '@d3ro/core/types'
+import { ErrorCode } from '@d3ro/core/errors'
 
 type KnowledgeView = 'kb' | 'insights'
 
@@ -46,15 +47,21 @@ export function KnowledgeBasePage(): React.ReactElement {
         loadDocuments()
       }
     })
-    const unsubComplete = window.electronAPI.rag.onIndexComplete(() => {
+    // 색인 실행이 끝나면(성공·실패 무관) 진행 표시를 내리고, 문서가 끝내 색인되지 않았으면 알린다.
+    const unsubComplete = window.electronAPI.rag.onIndexComplete((data) => {
       setIndexProgress(null)
-      loadDocuments()
+      void window.electronAPI.rag.getDocuments().then((resp) => {
+        if (!resp.success) return
+        setDocuments(resp.data)
+        const doc = resp.data.find((d) => d.id === data.documentId)
+        if (doc && !doc.indexed) setAddError(t('mobile.knowledge.error.indexUnavailable'))
+      })
     })
     return () => {
       unsubProgress()
       unsubComplete()
     }
-  }, [loadDocuments])
+  }, [loadDocuments, t])
 
   const isAddingRef = useRef(false)
 
@@ -87,7 +94,10 @@ export function KnowledgeBasePage(): React.ReactElement {
   )
 
   const handleReindex = useCallback(async (docId: string) => {
-    await window.electronAPI.rag.reindex(docId)
+    setAddError(null)
+    const resp = await window.electronAPI.rag.reindex(docId)
+    // 임베딩 실패는 rag:indexComplete 뒤 문서 상태로 알린다. 그 밖의 실패(문서 없음·파싱 실패)만 여기서 보인다.
+    if (!resp.success && resp.error.code !== ErrorCode.RAGEmbeddingFailed) setAddError(resp.error.message)
   }, [])
 
   const handleQuery = useCallback(async () => {