refactor: make calendar header and nav cross-service (events_url)

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

suma_browser/templates/_types/calendar/_nav.html

@@ -1,17 +1,12 @@
 <!-- Desktop nav -->
 {% import 'macros/links.html' as links %}
-{% call links.link(
-  url_for('blog.post.calendars.calendar.slots.get', slug=post.slug, calendar_slug=calendar.slug),
-  hx_select_search,
-  select_colours,
-  aclass=styles.nav_button
-) %}
+<a href="{{ events_url('/' + post.slug + '/calendars/' + calendar.slug + '/slots/') }}" class="{{styles.nav_button}}">
   <i class="fa fa-clock" aria-hidden="true"></i>
-  <div>
-    Slots
-  </div>
-{% endcall %}
+  <div>Slots</div>
+</a>
 {% if g.rights.admin %}
     {% from 'macros/admin_nav.html' import admin_nav_item %}
-    {{admin_nav_item(url_for('blog.post.calendars.calendar.admin.admin', slug=post.slug, calendar_slug=calendar.slug))}}
+    <a href="{{ events_url('/' + post.slug + '/calendars/' + calendar.slug + '/admin/') }}" class="{{styles.nav_button}}">
+      <i class="fa fa-cog" aria-hidden="true"></i>
+    </a>
 {% endif %}

suma_browser/templates/_types/calendar/header/_header.html

@@ -1,7 +1,7 @@
 {% import 'macros/links.html' as links %}
 {% macro header_row(oob=False) %}
   {% call links.menu_row(id='calendar-row', oob=oob) %}
-    {% call links.link(url_for('blog.post.calendars.calendar.get', slug=post.slug, calendar_slug= calendar.slug), hx_select_search) %}
+    <a href="{{ events_url('/' + post.slug + '/calendars/' + calendar.slug + '/') }}" class="flex items-center gap-2 px-3 py-2 rounded whitespace-normal text-center break-words leading-snug">
       <div class="flex flex-col md:flex-row md:gap-2 items-center min-w-0">
         <div class="flex flex-row items-center gap-2">
           <i class="fa fa-calendar"></i>
@@ -12,7 +12,7 @@
         {% from '_types/calendar/_description.html' import description %}
         {{description(calendar)}}
       </div>
-    {% endcall %}
+    </a>
     {% call links.desktop_nav() %}    
       {% include '_types/calendar/_nav.html' %}
     {% endcall %}