Fix DTO compatibility: replace ORM relationship traversals with DTO fields

Templates were accessing entry.calendar.name/slug/post via ORM relationships,
but these entries are now CalendarEntryDTOs. Use flat fields instead
(calendar_name, calendar_slug, etc.).

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

browser/templates/_types/blog/_card.html

@@ -76,7 +76,7 @@
           <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 = '/' + post.slug + '/calendars/' + entry.calendar.slug + '/' + entry.start_at.year|string + '/' + entry.start_at.month|string + '/' + entry.start_at.day|string + '/entries/' + entry.id|string + '/' %}
+                {% set _entry_path = '/' + post.slug + '/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="{{ 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]">

browser/templates/_types/cart/_cart.html

@@ -43,7 +43,7 @@
                 <li class="flex items-start justify-between text-sm">
                   <div>
                     <div class="font-medium">
-                      {{ entry.name or entry.calendar.name }}
+                      {{ entry.name or entry.calendar_name }}
                     </div>
                     <div class="text-xs text-stone-500">
                       {{ entry.start_at }}

browser/templates/_types/post/_entry_items.html

@@ -4,14 +4,14 @@
 {% 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 = '/' + post.slug + '/calendars/' + entry.calendar.slug + '/' + entry.start_at.year|string + '/' + entry.start_at.month|string + '/' + entry.start_at.day|string + '/entries/' + entry.id|string + '/' %}
+  {% set _entry_path = '/' + post.slug + '/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="{{ events_url(_entry_path) }}"
     class="{{styles.nav_button_less_pad}}"
   >
-    {% if entry.calendar.post.feature_image %}
-      <img src="{{ entry.calendar.post.feature_image }}"
-           alt="{{ entry.calendar.post.title }}"
+    {% if post.feature_image %}
+      <img src="{{ post.feature_image }}"
+           alt="{{ post.title }}"
            class="w-8 h-8 rounded object-cover flex-shrink-0" />
     {% else %}
       <div class="w-8 h-8 rounded bg-stone-200 flex-shrink-0"></div>

contracts/dtos.py

@@ -60,6 +60,8 @@ class CalendarEntryDTO:
     ticket_count: int | None = None
     calendar_name: str | None = None
     calendar_slug: str | None = None
+    calendar_container_id: int | None = None
+    calendar_container_type: str | None = None
 
 
 # ---------------------------------------------------------------------------

services/calendar_impl.py

@@ -42,6 +42,8 @@ def _entry_to_dto(entry: CalendarEntry) -> CalendarEntryDTO:
         ticket_count=entry.ticket_count,
         calendar_name=cal.name if cal else None,
         calendar_slug=cal.slug if cal else None,
+        calendar_container_id=cal.container_id if cal else None,
+        calendar_container_type=cal.container_type if cal else None,
     )