fix: preserve post admin nav bar across events app pages

- Add post-admin-header-child row to calendars, calendar, markets,
  and payments index templates so the admin nav bar persists
- Create events-app-specific post/admin nav and header templates
  using coop_url() for blog endpoints instead of url_for()

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

templates/_types/calendar/index.html

@@ -5,9 +5,11 @@
 {% block root_header_child %}
   {% from '_types/root/_n/macros.html' import index_row with context %}
   {% call index_row('post-header-child', '_types/post/header/_header.html') %}
-    {% call index_row('calendar-header-child', '_types/calendar/header/_header.html') %}
+    {% call index_row('post-admin-header-child', '_types/post/admin/header/_header.html') %}
-      {% block calendar_header_child %}
+      {% call index_row('calendar-header-child', '_types/calendar/header/_header.html') %}
-      {% endblock %}
+        {% block calendar_header_child %}
+        {% endblock %}
+      {% endcall %}
     {% endcall %}
   {% endcall %}
 {% endblock %}

templates/_types/calendars/index.html

@@ -5,9 +5,11 @@
 {% block root_header_child %}
   {% from '_types/root/_n/macros.html' import index_row with context %}
   {% call index_row('post-header-child', '_types/post/header/_header.html') %}
-    {% call index_row('calendars-header-child', '_types/calendars/header/_header.html') %}
+    {% call index_row('post-admin-header-child', '_types/post/admin/header/_header.html') %}
-      {% block calendars_header_child %}
+      {% call index_row('calendars-header-child', '_types/calendars/header/_header.html') %}
-      {% endblock %}
+        {% block calendars_header_child %}
+        {% endblock %}
+      {% endcall %}
     {% endcall %}
   {% endcall %}
 {% endblock %}

templates/_types/markets/index.html

@@ -5,9 +5,11 @@
 {% block root_header_child %}
   {% from '_types/root/_n/macros.html' import index_row with context %}
   {% call index_row('post-header-child', '_types/post/header/_header.html') %}
-    {% call index_row('markets-header-child', '_types/markets/header/_header.html') %}
+    {% call index_row('post-admin-header-child', '_types/post/admin/header/_header.html') %}
-      {% block markets_header_child %}
+      {% call index_row('markets-header-child', '_types/markets/header/_header.html') %}
-      {% endblock %}
+        {% block markets_header_child %}
+        {% endblock %}
+      {% endcall %}
     {% endcall %}
   {% endcall %}
 {% endblock %}

templates/_types/payments/index.html

@@ -5,9 +5,11 @@
 {% block root_header_child %}
   {% from '_types/root/_n/macros.html' import index_row with context %}
   {% call index_row('post-header-child', '_types/post/header/_header.html') %}
-    {% call index_row('payments-header-child', '_types/payments/header/_header.html') %}
+    {% call index_row('post-admin-header-child', '_types/post/admin/header/_header.html') %}
-      {% block payments_header_child %}
+      {% call index_row('payments-header-child', '_types/payments/header/_header.html') %}
-      {% endblock %}
+        {% block payments_header_child %}
+        {% endblock %}
+      {% endcall %}
     {% endcall %}
   {% endcall %}
 {% endblock %}

templates/_types/post/admin/_nav.html

@@ -0,0 +1,36 @@
+{% import 'macros/links.html' as links %}
+<div class="relative nav-group">
+  <a href="{{ events_url('/' + post.slug + '/calendars/') }}" class="{{styles.nav_button}}">
+    calendars
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ events_url('/' + post.slug + '/markets/') }}" class="{{styles.nav_button}}">
+    markets
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ events_url('/' + post.slug + '/payments/') }}" class="{{styles.nav_button}}">
+    payments
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ coop_url('/' + post.slug + '/admin/entries/') }}" class="{{styles.nav_button}}">
+    entries
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ coop_url('/' + post.slug + '/admin/data/') }}" class="{{styles.nav_button}}">
+    data
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ coop_url('/' + post.slug + '/admin/edit/') }}" class="{{styles.nav_button}}">
+    edit
+  </a>
+</div>
+<div class="relative nav-group">
+  <a href="{{ coop_url('/' + post.slug + '/admin/settings/') }}" class="{{styles.nav_button}}">
+    settings
+  </a>
+</div>

templates/_types/post/admin/header/_header.html

@@ -0,0 +1,12 @@
+{% import 'macros/links.html' as links %}
+{% macro header_row(oob=False) %}
+  {% call links.menu_row(id='post-admin-row', oob=oob) %}
+    <a href="{{ coop_url('/' + post.slug + '/admin/') }}"
+       class="flex items-center gap-2 px-3 py-2 rounded">
+      {{ links.admin() }}
+    </a>
+    {% call links.desktop_nav() %}
+      {% include '_types/post/admin/_nav.html' %}
+    {% endcall %}
+  {% endcall %}
+{% endmacro %}