🐛 Fix inconsistent picture rendering when using Markdown

Fixes: #828

CHANGELOG.md

@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Fixed
 
 - Featured images overlap page title when article metadata hidden ([#827](https://github.com/jpanther/congo/issues/827))
+- Inconsistent picture rendering between `figure` shortcode and Markdown render hook ([#828](https://github.com/jpanther/congo/issues/828))
 
 ## [2.8.2] - 2024-04-17
 

layouts/shortcodes/figure.html

@@ -5,7 +5,7 @@
   {{ $altText := .Get "alt" }}
   {{ $caption := .Get "caption" }}
   {{ $href := .Get "href" }}
-  {{ $class := .Get "class" }}
+  {{ $class := default "mx-auto my-0 rounded-md" (.Get "class") }}
 
   {{ $file := $url.Path }}
   {{ $img := .Page.Resources.GetMatch $file }}