AI: address issue #404

frontend/src/pages/wiki/WikiDetailPage.tsx

@@ -51,7 +51,8 @@ const WikiDetailPage: FC = () => {
       queryKey: helpKeys.titles ('ja'),
       queryFn: () => getHelpTitleIndex ('ja'),
       staleTime: Infinity })
-  const lookupTitle = title.trim ().normalize ('NFKC').toLowerCase ().replace (/^ヘルプ:/, '')
+  const lookupTitle = title.trim ().normalize ('NFKC').toLowerCase ()
+      .replace (/^(?:ヘルプ|手引):/, '')
   const identifiers = useMemo (() => (
       (titleIndex != null && Object.hasOwn (titleIndex, lookupTitle))
       ? titleIndex[lookupTitle] : []), [titleIndex, lookupTitle])