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>

apps/admin-web/src/views/KnowledgeView.vue

@@ -62,6 +62,14 @@ const groupsQuery = useQuery({
 const itemsQuery = useQuery({
   queryKey: computed(() => ['knowledge', 'items', selectedGroupId.value]),
   queryFn: () => knowledgeApi.listItems(selectedGroupId.value ?? undefined),
+  refetchInterval: (query) => {
+    const items = query.state.data as KnowledgeItem[] | undefined
+    if (!items || items.length === 0) return false
+    const hasInflight = items.some(
+      (item) => item.status !== 'completed' && item.status !== 'failed',
+    )
+    return hasInflight ? 5000 : false
+  },
 })
 
 const columns: TableColumnsType<KnowledgeItem> = [