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, 1 insertions, 0 deletions

diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index edab5fc..57d12e6 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -72,6 +72,7 @@
         </div>
       </div>
       <div id="right_column">
+        <%= open_erfas_today %>
         <%= tags %>
         <%= featured_articles %>
       </div>