Stage 5 click-testing fixes

- Fix link_to :method → button_to for all PUT/DELETE actions
- Add button_to CSS reset to admin.css for visual consistency
- Fix admin layout: replace broken jquery/jquery_ujs pipeline refs with
  admin_bundle via sprockets; add sprockets-rails, jquery-ui-rails gems
- Add app/assets/javascripts/admin_bundle.js pipeline manifest
- Fix event_information helper: use safe_join to avoid double-escaping
- Fix nodes_helper: to_s(:db) → to_fs(:db) for event times
- Fix revisions view: eliminate nested forms; diff button uses vanilla JS
  to collect radio button values before POST
- Fix config/environments/development.rb and test.rb: cache_classes →
  enable_reloading
- Add routing_filter_rails71_patch.rb version guard
- Move LockedByAnotherUser to own file for Zeitwerk autoloading
- Fix Globalize fallbacks via config.i18n.fallbacks in application.rb

1 files changed, 22 insertions, 0 deletions

diff --git a/public/stylesheets/admin.css b/public/stylesheets/admin.css
index 7031f77..1a29eff 100644
--- a/public/stylesheets/admin.css
+++ b/public/stylesheets/admin.css
@@ -116,6 +116,28 @@ input[type=submit],
   text-transform: lowercase;
 }
 
+/* button_to forms: render submit inputs as plain links */
+form.button_to {
+  display: inline;
+  margin: 0;
+  padding: 0;
+}
+
+form.button_to input[type="submit"] {
+  background: none;
+  border: none;
+  padding: 0;
+  margin: 0;
+  font: inherit;
+  color: inherit;
+  cursor: pointer;
+  text-decoration: underline;
+}
+
+form.button_to input[type="submit"]:hover {
+  color: inherit;
+}
+
 #admin_wizard {
   margin-bottom: 2rem;
 }