feat: integrate Quill rich text editor in admin templates

- Add Quill editor to content-page-edit.html
- Add Quill editor to vendor-product-edit.html
- Add Quill snow theme CSS
- Update background-tasks.html and platform-homepage.html templates

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/admin/platform-homepage.html

@@ -2,11 +2,20 @@
 {% extends "admin/base.html" %}
 {% from 'shared/macros/alerts.html' import loading_state, error_state, alert_dynamic %}
 {% from 'shared/macros/headers.html' import page_header_flex, action_button %}
+{% from 'shared/macros/richtext.html' import quill_css, quill_js, quill_editor %}
 
 {% block title %}Platform Homepage Manager{% endblock %}
 
 {% block alpine_data %}platformHomepageManager(){% endblock %}
 
+{% block quill_css %}
+{{ quill_css() }}
+{% endblock %}
+
+{% block quill_script %}
+{{ quill_js() }}
+{% endblock %}
+
 {% block content %}
 {# Note: Subtitle has inline HTML link, so using page_header_flex with custom structure #}
 <div class="flex items-center justify-between my-6">
@@ -128,18 +137,15 @@
 
             <!-- Content (HTML) -->
             <div class="mb-4">
-                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">
-                    Content (HTML)
-                </label>
-                <textarea
-                    x-model="page.content"
-                    rows="6"
-                    class="w-full px-3 py-2 text-gray-700 dark:text-gray-300 border border-gray-300 dark:border-gray-600 rounded-lg focus:outline-none focus:border-purple-500 dark:bg-gray-700 font-mono text-sm"
-                    placeholder="<p>Your platform description here...</p>"
-                ></textarea>
-                <p class="mt-1 text-xs text-gray-500 dark:text-gray-400">
-                    HTML content shown below the title. Basic HTML tags are supported.
-                </p>
+                {{ quill_editor(
+                    id='homepage-content-editor',
+                    model='page.content',
+                    label='Content',
+                    placeholder='Write your platform description here...',
+                    min_height='200px',
+                    toolbar='standard',
+                    help_text='HTML content shown below the title. Use the toolbar to format text, add links, and images.'
+                ) }}
             </div>
         </div>