Phase 2: chapter nodes, aggregate partial, fixes

- _chapter.html.erb: new partial for erfa/chaostreff aggregated lists;
  renders title, location, external_url, sanitized body
- content_helper: fix aggregate attr regex to allow hyphens in values
  (erfa-detail tag was silently dropped); add debug logging (remove)
- page.rb: suppress libxml stderr noise in rewrite_links_in_body
- db/seeds/chapters.rb: one-shot seed script for erfa and chaostreff
  chapter nodes under parent nodes 548/549; creates bilingual pages,
  external_url, primary events with RRULEs where known
  Note: run Node.rebuild!(false) after execution to fix lft/rgt values

1 files changed, 10 insertions, 0 deletions

diff --git a/app/views/custom/partials/_chapter.html.erb b/app/views/custom/partials/_chapter.html.erb
new file mode 100644
index 0000000..a5b8662
--- /dev/null
+++ b/app/views/custom/partials/_chapter.html.erb
@@ -0,0 +1,10 @@
+<div class="article_partial chapter_partial" lang="<%= page.effective_lang %>">
+  <h2 class="headline"><%= link_to_path page.title, page.node.unique_name %></h2>
+  <% if page.abstract.present? %>
+    <div class="chapter_location"><%= page.abstract %></div>
+  <% end %>
+  <% if page.node.external_url.present? %>
+    <div class="chapter_url"><%= link_to page.node.external_url, page.node.external_url, target: '_blank', rel: 'noopener' %></div>
+  <% end %>
+  <p class="excerpt"><%= sanitize page.body %></p>
+</div>