Add data-hx-disable to orders link to prevent htmx interception

The orders link navigates cross-domain (cart subdomain from coop) and
htmx 2.0 selfRequestsOnly blocks cross-origin requests. Explicitly
disable htmx on this link so the browser does a normal navigation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

browser/templates/_types/auth/_nav.html

@@ -3,7 +3,7 @@
   newsletters
 {% endcall %}
 <div class="relative nav-group">
-  <a href="{{ cart_url('/orders/') }}" class="{{styles.nav_button}}">
+  <a href="{{ cart_url('/orders/') }}" class="{{styles.nav_button}}" data-hx-disable>
     orders
   </a>
 </div>