feat: add trip/trips/stories templates, update nav and map/stats to use trip-relative paths

- Rename tracker.html.twig to dailies.html.twig; update dailies.md template key
- Fix map.html.twig and stats.html.twig: find dailies via page.parent().route
- Update base.html.twig nav to use config.site.active_trip for all hrefs
- Fix dailies.html.twig mini-map link to use page.parent().url/map
- Create trip.html.twig, trips.html.twig, stories.html.twig

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

themes/intotheeast/templates/stories.html.twig

@@ -0,0 +1,6 @@
+{% extends 'partials/base.html.twig' %}
+
+{% block content %}
+<h1>{{ page.title }}</h1>
+<p>Stories coming soon.</p>
+{% endblock %}