Calmer management UI: neutral buttons and badges, smaller buttons

Navy as the only accent, secondary buttons for restart/shutdown, the
destructive action as a red outline, status colour only in the badge
dot, no underline on the active nav item.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/voxip_kiosk/web/templates/network.html

@@ -15,7 +15,7 @@
   <p class="muted">Is het adres veranderd? Open dan <code>{{ admin_scheme }}://{{ pending.address.split('/')[0] }}:{{ admin_port }}/network</code>, log in en bevestig daar.</p>
   {% endif %}
   <div class="actions-row">
-    <form method="post" action="{{ url_for('ui.network_confirm') }}" class="inline-form">{{ csrf() }}<button class="btn btn-success btn-big">Bevestigen</button></form>
+    <form method="post" action="{{ url_for('ui.network_confirm') }}" class="inline-form">{{ csrf() }}<button class="btn btn-primary btn-big">Bevestigen</button></form>
     <form method="post" action="{{ url_for('ui.network_rollback') }}" class="inline-form">{{ csrf() }}<button class="btn btn-secondary btn-big">Nu terugdraaien</button></form>
   </div>
 </section>