<!-- This is a placeholder. In production, replace with actual PNG image -->
<!-- SVG placeholder for Hero block thumbnail -->
<svg width="400" height="300" xmlns="http://www.w3.org/2000/svg">
  <rect width="400" height="300" fill="#6366f1"/>
  <text x="200" y="150" font-family="Arial" font-size="24" fill="white" text-anchor="middle">Hero Section</text>
</svg>
