apropos: dynamic TOC via extractToc, HeadingPermalinkExtension, debug logging for TOC diagnosis

app/templates/public/about.php

@@ -34,14 +34,13 @@ function renderEntries(array $entries): string
 <main class="page-content" id="main-content">
 
     <!-- Table of contents: collapsible on mobile, force-open on desktop -->
+    <?php if (!empty($tocItems)): ?>
     <details class="toc">
         <summary><?= icon('caret-down', 0, 'toc-caret') ?> PARTIES</summary>
         <ul class="toc-list">
-            <li><a href="#apropos-intro">À propos</a></li>
-            <?php if (!empty($contacts)): ?>
-            <li><a href="#apropos-contacts">Contacts</a></li>
-            <?php endif; ?>
-            <li><a href="#apropos-credits">Crédits</a></li>
+            <?php foreach ($tocItems as $item): ?>
+            <li class="toc-level-<?= $item['level'] ?? 1 ?>"><a href="<?= htmlspecialchars($item['href']) ?>"><?= htmlspecialchars($item['label']) ?></a></li>
+            <?php endforeach; ?>
         </ul>
         <?php if (!empty($sidebarLinks)): ?>
         <?php foreach ($sidebarLinks as $sl): ?>
@@ -53,6 +52,7 @@ function renderEntries(array $entries): string
         <?php endforeach; ?>
         <?php endif; ?>
     </details>
+    <?php endif; ?>
 
     <article>
     <!-- Intro text from DB -->