Give the sitemap its own view, with collapse and descendant counts

Extracted from admin#index's inline table into NodesController#sitemap.
Nested <details>/<summary> per branch, one linear pass over the
existing flat [node, level] list (no added queries) -- each node's own
descendant count computed the same way, via a small stack rather than
re-walking the tree per node. Branches under updates/, club/erfas,
club/chaostreffs, and disclosure start collapsed by default
(CccConventions::SITEMAP_COLLAPSED_PATHS); any branch currently
collapsed, whether by that default or because someone just closed it,
is highlighted via a plain :not([open]) selector -- no state tracked
outside the DOM itself.

Dropped the update?-post exclusion this view used to rely on -- no
longer needed now that updates/ collapses instead of being filtered
out, so its real children (previously silently absent) now show up
correctly. admin#index's own, separate @sitemap query is unchanged;
that view has no collapse mechanism to compensate and wasn't part of
this.

1 files changed, 40 insertions, 0 deletions

diff --git a/public/stylesheets/admin.css b/public/stylesheets/admin.css
index aa8b288..5c1e489 100644
--- a/public/stylesheets/admin.css
+++ b/public/stylesheets/admin.css
@@ -25,6 +25,7 @@ a:hover {
    body content, node listing tables, the child-creation shortcuts on
    nodes#show, and the dashboard draft list's Show/Revisions links. */
 #page_editor a,
+#sitemap a,
 table.node_table a,
 table.assets_table a,
 table.events_table a,
@@ -104,6 +105,11 @@ input[type=radio] {
     width: 100%;
     box-sizing: border-box;
   }
+
+  #sitemap details details {
+    margin-left: 0.75rem;
+    padding-left: 0.5rem;
+  }
 }
 
 #metadata,
@@ -773,6 +779,40 @@ form.button_to button[type="submit"] {
   white-space: nowrap;
 }
 
+.sitemap_node {
+  padding-bottom: 0.5rem;
+  margin-bottom: 0.5rem;
+  border-bottom: 1px solid #ececec;
+}
+
+.sitemap_node h4 {
+  margin: 0;
+}
+
+.sitemap_node .field_hint {
+  display: block;
+  margin: 2px 0 0;
+}
+
+.sitemap_node p {
+  margin: 2px 0 0;
+}
+
+#sitemap details details {
+  margin-left: 1.5rem;
+  border-left: 1px solid #e8e8e8;
+  padding-left: 0.75rem;
+}
+
+#sitemap summary {
+  padding: 4px 0;
+}
+
+#sitemap details:not([open]) > summary {
+  color: #ff9600;
+  font-weight: bold;
+}
+
 /* ============================================================
    Page editor / metadata forms
    ============================================================ */