Surface node-kind conventions in the admin UI

nodes#new: each kind's radio button now shows a label plus a smaller,
muted .field_hint explaining what happens automatically (parent,
tags, template) - previously a single undifferentiated string mixing
a short label with a long parenthetical, cluttering the smaller kinds
(erfa/chaostreff) worst. Title field gets the same hint treatment,
telling editors up front that the slug is auto-generated and where to
adjust it later - the previous silence here meant editors only
discovered slug generation after already committing to a title, with
no visible way to fix it.

New "Resulting path" row live-previews the full URL (origin + kind's
path prefix + a debounced call to the new parameterize_preview route,
reusing the exact same slug_for helper "create" now calls, so the
preview can never diverge from what actually gets created) as the
editor types, plus a copy-to-clipboard button. For "generic", the
prefix comes from whichever parent gets chosen via the search widget,
not the registry - parent_search.link_closure now stashes the chosen
node's unique_name as a data attribute for exactly this.

New read-only admin/conventions view dumps the NODE_KINDS registry as
a reference table for whoever's confused later about how a given kind
behaves - deliberately just renders the same label/hint text used on
nodes#new rather than re-describing parent/tags/template separately,
since decomposing the parent Proc would mean either invoking it
(Update's has a real side effect - creates the year folder) or
re-stating its logic a second time in a different shape, either of
which risks drifting from the actual behavior.

nodes#edit's Template field gets a one-line hint noting the value may
already be pre-filled based on how the node was created - the one
place the previous commit's new inheritance mechanism actually
surfaces on this view.

1 files changed, 12 insertions, 0 deletions

diff --git a/public/stylesheets/admin.css b/public/stylesheets/admin.css
index a02bd61..f240bb2 100644
--- a/public/stylesheets/admin.css
+++ b/public/stylesheets/admin.css
@@ -508,6 +508,14 @@ table tr.header {
   text-align: left;
 }
 
+.field_hint {
+  display: block;
+  margin-top: 2px;
+  font-size: 0.75rem;
+  color: #969696;
+  padding-bottom: 4px;
+}
+
 #search_widget {
   position: absolute;
   top: 20px;
@@ -527,18 +535,21 @@ table tr.header {
   font-size: 18px;
 }
 
+#menu_search_results p,
 #search_results p {
   margin: 0;
   padding: 4px 4px 0 4px;
   border-bottom: 1px solid #e8e8e8;
 }
 
+#menu_search_results p a,
 #search_results p a {
   display: block;
   font-weight: bold;
   font-size: 0.95rem;
 }
 
+#menu_search_results p span.result_path,
 #search_results p span.result_path {
   display: block;
   margin-top: 2px;
@@ -548,6 +559,7 @@ table tr.header {
   padding-bottom: 4px;
 }
 
+#menu_search_results p.search_more,
 #search_results p.search_more {
   margin: 0;
   padding: 6px 4px;