STAMMBAUM-FULLDATE: volles Geburtsdatum auf Knoten-Karten (formatDate statt slice 4) + e2e

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

@@ -379,7 +379,7 @@ function PedigreeCard({
   const t = de.pages.stammbaum
   const g = node.gerbil
   const chip = farbschlag ? chipColorFor(farbschlag) : null
-  const year = g.dateOfBirth ? g.dateOfBirth.slice(0, 4) : null
+  const dob = g.dateOfBirth ? formatDate(g.dateOfBirth) : null
   return (
     <div
       className={isRoot ? 'pedigree-card pedigree-card--root' : 'pedigree-card'}
@@ -410,7 +410,7 @@ function PedigreeCard({
             {farbschlag}
           </span>
         )}
-        {year && <span className="pedigree-card__year">* {year}</span>}
+        {dob && <span className="pedigree-card__year">* {dob}</span>}
       </div>
       {node.expandable && (
         <button