Optimierung 5.3 (Teil 1): Contact::displayName()

Anzeigename eines Kontakts (Vor-/Nachname mit Fallback) als Model-Methode.
Ersetzt die identische Inline-Logik an 6 eindeutigen Relation-$contact-Stellen
(Admin: Benutzer-/PM-/Firmen-Detail; Kunde: Press-Kit-/PM-Detail).

Bewusst noch offen: Select-/toBase-Varianten ($contactOption/$contactResult/
$lookupContact, stdClass-Risiko) sowie web/release-detail (User-Frontend).

Test: ContactDisplayNameTest.

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

resources/views/livewire/customer/press-releases/show.blade.php

@@ -611,7 +611,7 @@ new #[Layout('components.layouts.app'), Title('Pressemitteilung')] class extends
                     @forelse ($contacts as $contact)
                         <div class="rounded-[5px] border border-[color:var(--color-bg-rule)] bg-[color:var(--color-bg-elev)] p-3">
                             <div class="text-[13px] font-semibold text-[color:var(--color-ink)]">
-                                {{ trim(($contact->first_name ?? '').' '.($contact->last_name ?? '')) ?: __('Kontakt ohne Name') }}
+                                {{ $contact->displayName() }}
                             </div>
                             <div class="text-[12px] text-[color:var(--color-ink-3)]">
                                 {{ $contact->responsibility ?: __('Keine Rolle hinterlegt') }}