feat: extract MediaController, wire into Dispatcher, delete media.php

app/templates/partials/form/checkbox-list.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Checkbox list partial — renders a group of checkboxes (e.g. languages, formats).
+ *
+ * The group label uses a visible <span> as the first column (matching other form
+ * rows), while a <fieldset>/<legend> in the second column provides the accessible
+ * grouping required by WCAG 1.3.1. The <legend> is visually hidden (sr-only) to
+ * avoid duplicating the visible label text.
+ *
+ * Variables consumed:
+ *   string  $name      — input name attribute (will be posted as array: name[])
+ *   string  $label     — group label text
+ *   array   $options   — each element must have 'id' and 'name' keys
+ *   array   $checked   — array of 'id' values that are currently checked
+ */
+
+$checked = $checked ?? [];
+?>
+<div>
+    <span class="admin-row-label"><?= htmlspecialchars($label) ?></span>
+    <fieldset class="admin-checkbox-group">
+        <legend class="sr-only"><?= htmlspecialchars($label) ?></legend>
+        <ul>
+            <?php foreach ($options as $opt): ?>
+            <li>
+                <label class="admin-checkbox-label">
+                    <input type="checkbox"
+                           name="<?= htmlspecialchars($name) ?>[]" 
+                           value="<?= htmlspecialchars((string)$opt['id']) ?>"
+                           <?= in_array((string)$opt['id'], array_map('strval', $checked)) ? 'checked' : '' ?>>
+                    <?= htmlspecialchars($opt['name']) ?>
+                </label>
+            </li>
+            <?php endforeach; ?>
+        </ul>
+    </fieldset>
+</div>
+<?php
+unset($checked);