fix: point entry/story back button at the trip page

The back pills use history.back() when history exists, but fall back to
href=page.parent().url for direct-landing visitors (shared link, new tab).
After Phase 1 that fallback pointed at the retired /dailies (404) and
/stories (redirect) containers. Point it at the trip page (grandparent)
instead, which is where the feed now lives.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/intotheeast/templates/entry.html.twig

@@ -1,12 +1,12 @@
 {% extends 'partials/base.html.twig' %}
 
 {% block content %}
-<a class="back-pill entry-back-fixed" href="{{ page.parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
+<a class="back-pill entry-back-fixed" href="{{ page.parent().parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
 
 {% set entry = page %}
 {% include 'partials/entry-journal.html.twig' %}
 
 <footer class="entry-footer">
-    <a class="back-pill" href="{{ page.parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
+    <a class="back-pill" href="{{ page.parent().parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
 </footer>
 {% endblock %}

themes/intotheeast/templates/story.html.twig

@@ -1,7 +1,7 @@
 {% extends 'partials/base.html.twig' %}
 
 {% block nav %}
-<a class="story-escape" href="{{ page.parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
+<a class="story-escape" href="{{ page.parent().parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
 <span class="story-nav-title" id="story-nav-title" aria-hidden="true">{{ page.title }}</span>
 {% endblock %}
 
@@ -59,7 +59,7 @@
     {{ page.content|raw }}
 
     <footer class="story-footer">
-        <a class="back-pill" href="{{ page.parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
+        <a class="back-pill" href="{{ page.parent().parent().url }}" onclick="if(history.length > 1){ history.back(); return false; }">← Back</a>
     </footer>
 </div>