feat(gpx-manager): list unpublished trips too, newest-first

Owner-only page, so drop the .published() filter and order by header.date_start
desc so the current/next trip is on top.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mpdu3Dt1iVoozHwAMyjrbn

themes/intotheeast/templates/gpx-manager.html.twig

@@ -2,7 +2,10 @@
 
 {% block content %}
 {% set trips_page = grav.pages.find('/trips') %}
-{% set trips = trips_page ? trips_page.children.published() : [] %}
+{# Owner-only page (admin login), so show unpublished trips too — no .published()
+   filter — and order newest first by trip start date so the current/next trip is
+   at the top. #}
+{% set trips = trips_page ? trips_page.children.order('header.date_start', 'desc') : [] %}
 
 <div class="gpx-manager">
     <h1 class="gpx-manager__title">GPX Files</h1>