Initial commit: Bocken theme for webtrees

Nord-themed dark/light mode family tree theme with:
- Floating glass-morphism header bar
- Auto/light/dark theme toggle with Lucide icons
- Smart SVG logo with theme-aware fill colors
- Active page highlighting with per-menu Nord icon colors
- Language button showing 2-letter abbreviation
- Start page search form
- Mobile responsive icon-only nav
- Custom views inherited from ArgonLight

resources/views/modules/block-template.phtml

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+use Fisharebest\Webtrees\I18N;
+
+/**
+ * @var string $block
+ * @var string $content
+ * @var string $config_url
+ * @var int $id
+ * @var string $title
+ */
+
+?>
+
+<div class="mb-4 wt-block wt-block-<?= e($block) ?>" id="block-<?= e($id) ?>">
+    <h3 class="wt-block-header wt-block-header-<?= e($block) ?>">
+        <?php if ($config_url !== '') : ?>
+            <a class="btn btn-link" href="<?= e($config_url) ?>" title="<?= I18N::translate('Preferences') ?>">
+                <?= view('icons/preferences') ?>
+                <span class="visually-hidden"><?= I18N::translate('Preferences') ?></span>
+            </a>
+        <?php endif ?>
+        <?= $title ?>
+    </h3>
+    <div class="wt-block-content wt-block-content-<?= e($block) ?>">
+        <?= $content ?>
+    </div>
+</div>