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, 4 insertions, 1 deletions

diff --git a/app/views/nodes/edit.html.erb b/app/views/nodes/edit.html.erb
index 31f585c..2d0edc1 100644
--- a/app/views/nodes/edit.html.erb
+++ b/app/views/nodes/edit.html.erb
@@ -44,7 +44,10 @@
     <div class="node_content"><%= d.datetime_select :published_at, :value => @draft.published_at %></div>
 
     <div class="node_description">Template</div>
-    <div class="node_content"><%= d.select :template_name, custom_page_templates, {:prompt => 'Select Template'} %></div>
+    <div class="node_content">
+    <%= d.select :template_name, custom_page_templates, {:prompt => 'Select Template'} %>
+    <span class="field_hint">Set automatically based on how this node was created - change it if needed.</span>
+    </div>
 
     <div class="node_description">Author</div>
     <div class="node_content"><%= d.select :user_id, user_list %></div>