Inline code preview into block properties dialog, reduce backdrop opacity

Author: milanofthe

src/app.css

@@ -269,7 +269,7 @@ input::placeholder {
 .dialog-backdrop {
 	position: fixed;
 	inset: 0;
-	background: rgba(0, 0, 0, 0.3);
+	background: rgba(0, 0, 0, 0.15);
 	backdrop-filter: blur(4px);
 	display: flex;
 	align-items: center;