Add 'open today' sidebar widget and open days in chapter lists

- open_erfas_today helper: samples 3 random open-day-tagged occurrences
  of the current day; widget hidden entirely on days without open
  chapters; heading shows current weekday
- content/_open_erfas_today partial rendered in right column above
  tags and featured articles
- _chapter partial: open-day schedules (event_schedule_text) shown
  inline in aggregated chapter lists with 'Offene Tage' label
- ccc.css: open_erfas_today added to existing right-column widget
  selector groups (headings, lists, links)

1 files changed, 9 insertions, 0 deletions

diff --git a/app/views/custom/partials/_chapter.html.erb b/app/views/custom/partials/_chapter.html.erb
index a5b8662..805559b 100644
--- a/app/views/custom/partials/_chapter.html.erb
+++ b/app/views/custom/partials/_chapter.html.erb
@@ -6,5 +6,14 @@
   <% 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 %>
+  <% open_days = page.node.events.tagged_with('open-day').order(:start_time) %>
+  <% if open_days.any? %>
+    <div class="chapter_open_days">
+      <span class="open_days_label"><%= t(:open_days_label) %>: </span>
+      <% open_days.each do |event| %>
+        <span class="event_schedule"><%= event_schedule_text(event) %></span>
+      <% end %>
+    </div>
+  <% end %>
   <p class="excerpt"><%= sanitize page.body %></p>
 </div>