big update

partials/structure/footer.php

@@ -0,0 +1,15 @@
+<?php
+$version = $GLOBALS['app_version'] ?? null;
+?>
+<footer class="app-footer border-t border-slate-200 bg-white mt-8">
+    <div class="max-w-6xl mx-auto px-4 py-6 flex flex-wrap items-center gap-3 text-sm text-slate-500">
+        <span>© <?= date('Y') ?> Email Template System</span>
+        <span class="ms-auto inline-flex items-center gap-1 text-slate-600">
+            <span class="text-xs uppercase tracking-[0.2em] text-slate-400">Version</span>
+            <strong><?= htmlspecialchars($version ?? '—') ?></strong>
+        </span>
+    </div>
+</footer>
+<?php if ($version): ?>
+    <div class="app-version-fixed">v <?= htmlspecialchars($version) ?></div>
+<?php endif; ?>