Fix events CRUD for standalone events and add events to admin menu

- event_params now permits title, description, is_primary
- event_information helper lists all node.events, not just the first
- Occurrence.generate handles nil node (standalone events)
- Page.aggregate order_by title uses correlated subquery to avoid
  GROUP BY conflict with tag-filter path; order_direction whitelisted
  to ASC/DESC to prevent SQL injection
- Events link added to admin menu bar
- events/index shows title, is_primary; drops latitude/longitude columns

1 files changed, 1 insertions, 0 deletions

diff --git a/app/views/admin/_menu.html.erb b/app/views/admin/_menu.html.erb
index 6dba085..c87c5f7 100644
--- a/app/views/admin/_menu.html.erb
+++ b/app/views/admin/_menu.html.erb
@@ -4,5 +4,6 @@
 <a href="#" onclick="admin_search.display_toggle(); return false;">search</a>
 <%= link_to 'Nodes', nodes_path, selected?('nodes') %>
 <%= link_to 'Assets', assets_path, selected?('assets') %>
+<%= link_to 'Events', events_path, selected?('events') %>
 <%= link_to 'User', users_path, selected?('users') %>
 <%= link_to 'Navigation', menu_items_path, selected?('menu_items') %> &gt;&nbsp;