fix: JS syntax error on pages with special characters in content

x-data editor() arguments used manual |e escaping with single quotes.
Page content containing newlines, quotes or backslashes broke the
JavaScript string literal. Now uses |tojson filter for all fields
(proper JSON escaping).

app/templates/page_editor.html

@@ -7,7 +7,7 @@
 {% endblock %}
 
 {% block content %}
-<div class="page-editor-wrapper" x-data="editor('{{ page.id }}', '{{ page.title|e }}', '{{ page.content_format }}', '{{ page.content|e }}', {{ page_favorited | tojson }})" x-init="init()">
+<div class="page-editor-wrapper" x-data="editor({{ page.id }}, {{ page.title | tojson }}, {{ page.content_format | tojson }}, {{ page.content | tojson }}, {{ page_favorited | tojson }})" x-init="init()">
 
   <!-- ═══════════ Top Action Bar ═══════════ -->
   <div class="page-topbar">