Add GPX trail maps to blog posts

This adds a trail flow block so posts can include attached GPX files as
interactive maps with route display, elevation charts, activity
summaries, and start/finish markers.

The trail assets are loaded only when needed, keeping the shared
templates clean while vendoring the Leaflet dependencies required for
offline, self-hosted map rendering.

1 files changed, 11 insertions, 2 deletions

diff --git a/templates/macros/blog.html b/templates/macros/blog.html
index 7f2ca60..13c2526 100644
--- a/templates/macros/blog.html
+++ b/templates/macros/blog.html
@@ -19,6 +19,16 @@
 {% endmacro %}
 
 {% macro render_blog_post(post, show_toc=True) %}
+  {% set toc = namespace(items=[]) %}
+
+  {% if show_toc and post.render_toc %}
+    {% for block in post.body.blocks %}
+      {% if block._flowblock == "markdown" and block.text %}
+        {% set toc.items = toc.items + (block.text.toc | default([])) %}
+      {% endif %}
+    {% endfor %}
+  {% endif %}
+
   <article class="h-entry">
     <header>
       <div>
@@ -68,8 +78,7 @@
         </dl>
       </div>
       {% if show_toc and post.render_toc %}
-        {% set toc = post.body.toc|default([]) %}
-        {{ render_toc(toc) }}
+        {{ render_toc(toc.items) }}
       {% endif %}
     </header>
     <div class="e-content">{{ post.body }}</div>