Add support for the Belgrade theme
>>> [!note] Migrated issue
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Reported by: [murz](https://www.drupal.org/user/157092)
Related to !95
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Would be great to add support for the <a href="https://www.drupal.org%20https://www.drupal.org/project/belgrade">Belgrade theme</a> that is used in the Commerce Kickstart installation of Drupal.</p>
<p>Mostly, it works well, but requires fixing some compatibility issues:<br>
- Fix displaying the nested categories in the list as the open tree (by default, it requires a click to open)<br>
- Fix displaying the cart in the header, opening the dropdown on click.<br>
- Missing loading and reloading animation.</p>
<p>Also, check for other issues and fix them.</p>
<p>Together with this, make the list of recommended themes more compact - a one line of text with inline action links like this:</p>
<pre>Bootstrap-compatible theme: [theme name] - installed as default<br><br>Bootstrap framework is used to design the pages for demo purpose. Use any Bootstrap-compatible Drupal theme to make the pages look well, or override the templates to integrate with any other CSS framework you want. Suggested themes:<br><br> FlexiStyle Bootstrap [used now] | Bootstrap [choose] | Bootstrap5 [install] | UI Suite Bootstrap [download] | ... </pre>
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