test(simple-message-app): expand screenshot fixture message body and regenerate screenshots

- Replace placeholder message_body with a two-paragraph descriptive text
- Regenerate all resolution screenshots to reflect the updated content

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nicomiguelino

edge-apps/simple-message-app/e2e/screenshots.spec.ts

@@ -12,7 +12,8 @@ const { screenlyJsContent } = createMockScreenlyForScreenshots(
   { coordinates: [40.7128, -74.006], location: 'New York, NY' },
   {
     enable_analytics: 'true',
-    message_body: 'A simple message app...',
+    message_body:
+      'A simple message app allows users to display text on a screen, making it a basic tool for digital signage. Users can input and edit both the heading and message body directly from the Screenly web console.\n\nWhether used for announcements, reminders, or general information, it provides a straightforward way to communicate with your audience.',
     message_header: 'Simple Message App',
     override_locale: 'en',
     override_timezone: 'America/New_York',