fix: show nameless fallback (ohne Namen) for nameless parents in litters list and detail pages

gerbil-manager-web/src/pages/WuerfeListPage.tsx

@@ -1,4 +1,4 @@
-import { useMemo, useState } from 'react'
+import { useCallback, useMemo, useState } from 'react'
 import { Link } from 'react-router-dom'
 import { de } from '../strings/de'
 import { listLitters } from '../api/litters'
@@ -62,11 +62,11 @@ export default function WuerfeListPage() {
     for (const g of gerbils.data?.items ?? []) map.set(g.id, g)
     return map
   }, [gerbils.data])
-  const parentName = (id: string | null): string => {
+  const parentName = useCallback((id: string | null): string => {
     if (!id) return '—'
     const gp = gerbilById.get(id)
-    return gp ? gerbilName(gp) || t.detail.unknownParent : t.detail.unknownParent
-  }
+    return gp ? gerbilName(gp) || de.pages.gerbils.nameless : t.detail.unknownParent
+  }, [gerbilById, gerbilName, t.detail.unknownParent])
 
   // Litters tab (paged, filtered).
   const filter = andFilter(
@@ -96,7 +96,7 @@ export default function WuerfeListPage() {
       parentName(p.fatherId).toLowerCase().includes(term) ||
       parentName(p.motherId).toLowerCase().includes(term)
     )
-  }, [pairs, search, gerbilById])
+  }, [pairs, search, parentName])
 
   const items = litters.items
 

gerbil-manager-web/src/pages/WurfDetailPage.tsx

@@ -141,7 +141,7 @@ export default function WurfDetailPage() {
   const l = litter.data
   const registered = juveniles.data?.totalCount ?? 0
   const parentLink = (id: string | null, g: Gerbil | null) =>
-    id && g ? <Link to={`/rennmaeuse/${id}`}>{gerbilName(g)}</Link> : t.detail.unknownParent
+    id && g ? <Link to={`/rennmaeuse/${id}`}>{gerbilName(g) || de.pages.gerbils.nameless}</Link> : t.detail.unknownParent
 
   return (
     <section className="page">