Tables with a header row can be sorted by clicking a column header

Listing tables on company, taxonomy and generic list pages get column headers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

layouts/list.html

@@ -1,5 +1,5 @@
 {{ define "main" }}
 <h1>{{ .Title }}</h1>
 <div class="content">{{ .Content }}</div>
-{{ partial "page-list.html" .RegularPages.ByTitle }}
+{{ partial "page-list.html" (dict "pages" .RegularPages.ByTitle "head" true) }}
 {{ end }}