Preserve formatting of non-html extension widget content

internal/glance/static/main.css

@@ -273,6 +273,10 @@
     background-color: var(--color-separator);
 }
 
+pre {
+    font: inherit;
+}
+
 ::selection {
     background-color: hsl(var(--bghs), calc(var(--scheme) (var(--scheme) var(--bgl) + 20%)));
     color: var(--color-text-highlight);

internal/glance/widget-extension.go

@@ -103,7 +103,7 @@ func convertExtensionContent(options extensionRequestOptions, content []byte, co
 
 		fallthrough
 	default:
-		return template.HTML(html.EscapeString(string(content)))
+		return template.HTML("<pre>" + html.EscapeString(string(content)) + "</pre>")
 	}
 }