fix(knowledge): refresh inflight items and skip empty chunked groups

Poll the knowledge item list every 5s while any item is still pending
or processing so the UI reflects ingestion progress without manual
refresh, and exclude items that have no active chunks from group
counters so groups with no usable content do not appear populated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/app/knowledge_service.go

@@ -240,10 +240,20 @@ func (s *KnowledgeService) ListGroups(ctx context.Context) ([]KnowledgeGroupResp
 	}
 
 	countRows, err := s.pool.Query(ctx, `
-		SELECT group_id, COUNT(*)::bigint
-		FROM knowledge_items
-		WHERE tenant_id = $1 AND deleted_at IS NULL
-		GROUP BY group_id
+		SELECT ki.group_id, COUNT(DISTINCT ki.id)::bigint
+		FROM knowledge_items ki
+		WHERE ki.tenant_id = $1
+		  AND ki.deleted_at IS NULL
+		  AND ki.status = 'completed'
+		  AND EXISTS (
+			  SELECT 1
+			  FROM knowledge_chunks_meta kcm
+			  WHERE kcm.tenant_id = ki.tenant_id
+			    AND kcm.knowledge_item_id = ki.id
+			    AND kcm.item_version = ki.item_version
+			    AND kcm.status = 'active'
+		  )
+		GROUP BY ki.group_id
 	`, actor.TenantID)
 	if err != nil {
 		return nil, response.ErrInternal(50050, "knowledge_group_counts_query_failed", "failed to list knowledge group counts")