UI-POLISH-2: '(ohne Namen)' Platzhalter in Stammbaum, Vertrag-Wizard, Wurf-Formular

- StammbaumPage: PedigreeCard-Name + PrintCell-Name + beide titleFor()-Aufrufe → g.name || nameless
- VertragWizardPage: wizard-pick__name + join(', ')-Tierliste → g.name || nameless
- WurfFormPage: fatherName/motherName in Prefill (nameById.get || nameless) + Picker-Auswahl (g.name || nameless)

e2e: neuer Test stammbaum.spec — namenloser Ahne zeigt Platzhalter in Karte + Titel

Gate: vitest 82/82, e2e 148/148, tsc clean

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

@@ -326,7 +326,7 @@ export default function VertragWizardPage() {
                     checked={selectedIds.has(g.id)}
                     onChange={() => toggleAnimal(g.id)}
                   />
-                  <span className="wizard-pick__name">{g.name}</span>
+                  <span className="wizard-pick__name">{g.name || de.pages.gerbils.nameless}</span>
                   <span className="wizard-pick__meta">
                     {[
                       genderLabel(g.gender),
@@ -396,7 +396,7 @@ export default function VertragWizardPage() {
             </div>
             <div className="def-row">
               <dt>{de.pages.vertraege.fields.animals}</dt>
-              <dd>{selectedAnimals.map((g) => g.name).join(', ')}</dd>
+              <dd>{selectedAnimals.map((g) => g.name || de.pages.gerbils.nameless).join(', ')}</dd>
             </div>
             <div className="def-row">
               <dt>{de.pages.vertraege.fields.price}</dt>