perf(backoffice): Summernote só nas páginas com editor

Os ~100 KB do editor e da tradução eram carregados em todas as páginas do
backoffice. Agora o footer só os pede quando existe um textarea.js-wysiwyg.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

includes/footer.php

@@ -6,14 +6,14 @@
 <?= script_tag('assets/vendor/jquery/jquery-3.7.1.min.js') ?>
 <?= script_tag('assets/vendor/bootstrap5/js/bootstrap.bundle.min.js') ?>
 <?= script_tag('assets/js/password-toggle.js') ?>
-<?= script_tag('assets/vendor/summernote/summernote-bs5.min.js') ?>
+<?php // Summernote (~100 KB) só nas páginas que têm um editor: carregado a pedido, abaixo. ?>
-<?= script_tag('assets/vendor/summernote/lang/summernote-pt-PT.min.js') ?>
+<script>window.SUMMERNOTE_SRC = [<?= json_encode(_asset_versioned('assets/vendor/summernote/summernote-bs5.min.js')) ?>, <?= json_encode(_asset_versioned('assets/vendor/summernote/lang/summernote-pt-PT.min.js')) ?>];</script>
 <script>
 // Attach Summernote to any <textarea class="js-wysiwyg">. The editor keeps the
 // underlying textarea in sync, so normal form POSTs submit the generated HTML.
 // Inline image upload is intentionally omitted (base64 would bloat the row) —
 // modules that need images use their own file-upload fields.
-document.addEventListener('DOMContentLoaded', function () {
+function initWysiwyg() {
     if (!window.jQuery || !jQuery.fn || !jQuery.fn.summernote) return;
     jQuery('textarea.js-wysiwyg').each(function () {
         var $ta = jQuery(this);
@@ -32,6 +32,17 @@ document.addEventListener('DOMContentLoaded', function () {
             popover: { image: [], air: [] }
         });
     });
+}
+document.addEventListener('DOMContentLoaded', function () {
+    if (!document.querySelector('textarea.js-wysiwyg')) return;
+    // Carrega o editor e a tradução por ordem, só aqui.
+    (function next(i) {
+        if (i >= window.SUMMERNOTE_SRC.length) return initWysiwyg();
+        var s = document.createElement('script');
+        s.src = window.SUMMERNOTE_SRC[i];
+        s.onload = function () { next(i + 1); };
+        document.body.appendChild(s);
+    })(0);
 });
 
 // Tema: claro / escuro / automático (o <head> já aplicou o guardado).