fix: replace blog.post.calendars url_for with events_url

Calendar routes no longer exist in blog service. Post nav,
entry items, blog cards, and header templates now link to
events service via events_url() helper.

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

suma_browser/templates/_types/blog/_card.html

@@ -76,14 +76,9 @@
           <div class="overflow-x-auto scrollbar-hide" style="scroll-behavior: smooth;">
             <div class="flex gap-2 px-2">
               {% for entry in post.associated_entries %}
+                {% set _entry_path = '/calendars/' + entry.calendar.slug + '/' + entry.start_at.year|string + '/' + entry.start_at.month|string + '/' + entry.start_at.day|string + '/entries/' + entry.id|string + '/' %}
                 <a
-                  href="{{ url_for('blog.post.calendars.calendar.day.calendar_entries.calendar_entry.get',
-                                   slug=post.slug,
-                                   calendar_slug=entry.calendar.slug,
-                                   year=entry.start_at.year,
-                                   month=entry.start_at.month,
-                                   day=entry.start_at.day,
-                                   entry_id=entry.id) }}"
+                  href="{{ events_url(_entry_path) }}"
                   class="flex flex-col gap-1 px-3 py-2 bg-stone-50 hover:bg-stone-100 rounded border border-stone-200 transition text-sm whitespace-nowrap flex-shrink-0 min-w-[180px]">
                   <div class="font-medium text-stone-900 truncate">{{ entry.name }}</div>
                   <div class="text-xs text-stone-600">

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

@@ -1,7 +1,7 @@
 {% import 'macros/links.html' as links %}
 {% macro header_row(oob=False) %}
   {% call links.menu_row(id='calendars-row', oob=oob) %}
-    {% call links.link(url_for('blog.post.calendars.home', slug=post.slug), hx_select_search) %}
+    {% call links.link(events_url('/calendars/'), hx_select_search) %}
       <i class="fa fa-calendar" aria-hidden="true"></i>
       <div>
         Calendars

suma_browser/templates/_types/post/_entry_items.html

@@ -4,14 +4,9 @@
 {% set has_more_entries = has_more if has_more is defined else (associated_entries.has_more if associated_entries is defined else False) %}
 
 {% for entry in entry_list %}
+  {% set _entry_path = '/calendars/' + entry.calendar.slug + '/' + entry.start_at.year|string + '/' + entry.start_at.month|string + '/' + entry.start_at.day|string + '/entries/' + entry.id|string + '/' %}
   <a
-    href="{{ url_for('blog.post.calendars.calendar.day.calendar_entries.calendar_entry.get',
-                     slug=entry.calendar.post.slug,
-                     calendar_slug=entry.calendar.slug,
-                     year=entry.start_at.year,
-                     month=entry.start_at.month,
-                     day=entry.start_at.day,
-                     entry_id=entry.id) }}"
+    href="{{ events_url(_entry_path) }}"
     class="{{styles.nav_button_less_pad}}"
   >
     {% if entry.calendar.post.feature_image %}

suma_browser/templates/_types/post/admin/_nav.html

@@ -1,5 +1,5 @@
 {% import 'macros/links.html' as links %}
-{% call links.link(url_for('blog.post.calendars.home', slug=post.slug), hx_select_search, select_colours, True, aclass=styles.nav_button) %}
+{% call links.link(events_url('/calendars/'), hx_select_search, select_colours, True, aclass=styles.nav_button) %}
   calendars
 {% endcall %}
 {% call links.link(url_for('blog.post.admin.entries', slug=post.slug), hx_select_search, select_colours, True, aclass=styles.nav_button) %}

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

@@ -1,7 +1,7 @@
 {% import 'macros/links.html' as links %}
 {% macro header_row(oob=False) %}
   {% call links.menu_row(id='post_data-row', oob=oob) %}
-    {% call links.link(url_for('blog.post.calendars.home', slug=post.slug), hx_select_search) %}
+    {% call links.link(events_url('/calendars/'), hx_select_search) %}
      <i class="fa fa-database" aria-hidden="true"></i>
       <div>
         data