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

app/templates/admin/footer.php

@@ -0,0 +1,39 @@
+<?php include APP_ROOT . '/templates/partials/flash-messages.php'; ?>
+
+<!-- Fixed toast container (bottom-center, always visible) -->
+<div id="toast-container" aria-live="polite"></div>
+
+<?php foreach ($extraJs ?? [] as $js): ?>
+<script src="<?= App::assetV($js) ?>"></script>
+<?php endforeach; ?>
+<?php if (!empty($extraJsInline)): ?>
+<script><?= $extraJsInline ?></script>
+<?php endif; ?>
+<script src="/assets/js/htmx.min.js"></script>
+<script>
+(function () {
+    var box = document.getElementById('toast-container');
+    if (!box) return;
+
+    // 1) Flash messages from hidden #admin-toasts
+    var src = document.getElementById('admin-toasts');
+    if (src) {
+        src.querySelectorAll('.toast').forEach(function (t) { box.appendChild(t); });
+        src.remove();
+    }
+
+    // 2) Orphaned .toast elements rendered inline by pages (login, thanks, etc.)
+    document.querySelectorAll('.toast:not(#toast-container .toast)')
+        .forEach(function (t) { box.appendChild(t); });
+
+    // Auto-dismiss every toast after 4 seconds
+    box.querySelectorAll('.toast').forEach(function (toast, i) {
+        setTimeout(function () {
+            toast.classList.add('toast-exit');
+            toast.addEventListener('animationend', function () { toast.remove(); });
+        }, 4000 + (i * 200));
+    });
+})();
+</script>
+</body>
+</html>