fix: x-data quotes conflict — tojson double-quotes break HTML attribute

tojson outputs JSON with double quotes, which clash with x-data="..."
HTML attribute delimiter. Changed x-data delimiters to single quotes
so JSON double quotes are contained properly within the attribute.

app/templates/page_editor.html

@@ -7,7 +7,7 @@
 {% endblock %}
 
 {% block content %}
-<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()">
+<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">