Style property cards with red border and dark background

Matches service cards styling:
- Dark background (--color-bg-dark)
- Red accent border (--color-accent)
- Rounded corners with overflow hidden

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

wp-content/themes/homeproz/template-parts/property/property-card.scss

@@ -8,6 +8,10 @@
     display: flex;
     flex-direction: column;
     height: 100%;
+    background-color: var(--color-bg-dark);
+    border: 1px solid var(--color-accent);
+    border-radius: 0.5rem;
+    overflow: hidden;
 }
 
 .property-card-image {