FEAT-1: Tiere list page — Gridify filters (Status/Geschlecht/Farbschlag), sort, paging + German strings

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

gerbil-manager-web/src/format/labels.ts

@@ -0,0 +1,19 @@
+/** German label helpers for enum values and lookups. */
+import { de } from '../strings/de'
+import type { Gender, GerbilStatus } from '../api/types'
+
+export function genderLabel(gender: Gender): string {
+  return de.pages.gerbils.genderLabels[gender]
+}
+
+export function statusLabel(status: GerbilStatus): string {
+  return de.pages.gerbils.statusLabels[status]
+}
+
+/** Format an ISO date ("YYYY-MM-DD") as German "TT.MM.JJJJ"; null -> dash. */
+export function formatDate(iso: string | null | undefined): string {
+  if (!iso) return '—'
+  const [y, m, d] = iso.split('-')
+  if (!y || !m || !d) return iso
+  return `${d}.${m}.${y}`
+}