v03.09.16: brand-aside columns, offline page redesign, variable click-to-copy

- Brand-aside position now uses flex columns like top-a (card style, equal-width)
- Offline page: external offline.css with theme variables, 3-column centered card
  layout, Osaka font loading, full-screen on mobile
- CSS variable click-to-copy: scans text for --var patterns, wraps in clickable
  chips with toast notification on copy
- Search button border matches input border (--input-border-color)
- mod_stats override: converted from dl to table layout
- Patch bump 03.09.15 → 03.09.16

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/html/mod_stats/default.php

@@ -26,10 +26,14 @@ $headerClass = htmlspecialchars($params->get('header_class', ''), ENT_COMPAT, 'U
     <?php if ($module->showtitle) : ?>
         <<?php echo $headerTag; ?> class="mod-stats__title<?php echo $headerClass ? ' ' . $headerClass : ''; ?>"><?php echo $module->title; ?></<?php echo $headerTag; ?>>
     <?php endif; ?>
-    <dl class="mod-stats__list">
-        <?php foreach ($list as $item) : ?>
-            <dt class="mod-stats__label"><?php echo $item->title; ?></dt>
-            <dd class="mod-stats__data"><?php echo $item->data; ?></dd>
-        <?php endforeach; ?>
-    </dl>
+    <table class="mod_stats__table">
+        <tbody>
+            <?php foreach ($list as $item) : ?>
+                <tr>
+                    <th class="mod_stats__label" scope="row"><?php echo $item->title; ?></th>
+                    <td class="mod_stats__data"><?php echo $item->data; ?></td>
+                </tr>
+            <?php endforeach; ?>
+        </tbody>
+    </table>
 </div>