CKEditor Dropdown Panel has incorrect colors in Dark Mode and missing border-radius styling
>>> [!note] Migrated issue
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<!-- Migrated from issue #3562407. -->
Reported by: [simeoni](https://www.drupal.org/user/3852574)
Related to !729
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>When using CKEditor in the GIN theme, the "Styles" dropdown panel and its style buttons have multiple styling issues:<br>
Dark Mode:<br>
The dropdown panel background is white instead of dark.</p>
<p>The style button labels (for Text Styles and Block Styles) have incorrect background and border colors<br>
Both Light and Dark Mode.</p>
<p>The style button preview and label elements are missing rounded corners (border-radius), inconsistent with GIN's design language.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>Dark Mode Issues:</p>
<p>Enable GIN theme<br>
Enable dark mode in GIN<br>
Configure CKEditor with Text Styles and Block Styles in the Styles dropdown<br>
Open CKEditor<br>
Click on the "Styles" dropdown<br>
Observe:</p>
<p>White dropdown panel background instead of dark<br>
Incorrectly styled label buttons for Text Styles and Block Styles</p>
<p>Border-radius Issue (both modes):</p>
<p>Enable GIN theme (in either light or dark mode)<br>
Configure CKEditor with Text Styles and Block Styles in the Styles dropdown<br>
Open CKEditor<br>
Click on the "Styles" dropdown<br>
Observe:</p>
<p>Style button preview and label elements have sharp corners instead of rounded corners<br>
This is inconsistent with GIN's design language</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>See attached merge request / patch</p>
> Related issue: [Issue #3517732](https://www.drupal.org/node/3517732)
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