Add company welcome and verified NetKingdom sign-in

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a092fe-13b1-7f12-ac74-7d258af4d79c

vergabe_teilnahme/templates/partials/topbar.html

@@ -7,7 +7,7 @@
     </svg>
   </button>
 
-  <a href="{% url 'home' %}" class="text-brand-700 font-semibold text-lg shrink-0">Vergabe Teilnahme</a>
+  <a href="{% url 'home' %}" class="text-brand-700 font-semibold text-lg shrink-0">Vergabe Teilnahme{% if company_name %}<span class="block text-xs text-slate-500">{{ company_name }}</span>{% endif %}</a>
 
   <form hx-get="{% url 'suche' %}" hx-target="#search-results" hx-trigger="input changed delay:300ms"
         class="relative flex-1 max-w-lg mx-auto">
@@ -39,8 +39,10 @@
       <div class="px-3 py-2 text-xs text-slate-500 border-b border-slate-100">
         {{ request.user.get_rolle_display|default:"Mitarbeiter" }}
       </div>
+      {% if request.user.has_usable_password %}
       <a href="{% url 'accounts:password_change' %}"
          class="block px-3 py-2 text-sm text-slate-700 hover:bg-slate-50">Passwort ändern</a>
+      {% endif %}
       <form method="post" action="{% url 'accounts:logout' %}">
         {% csrf_token %}
         <button type="submit" class="block w-full text-left px-3 py-2 text-sm text-slate-700 hover:bg-slate-50">Abmelden</button>