Improve dark mode styling

Use codex design tokens to replace hard-coded colors for Special:RequestWikiQueue details.

Tested on Chrome/Firefox's dev tools.

Author: lihaohong6

modules/ext.createwiki.oouiform.ooui.less

@@ -36,7 +36,7 @@
 .ext-createwiki-tabs > .oo-ui-menuLayout-content > .oo-ui-indexLayout-stackLayout > .oo-ui-tabPanelLayout {
 	/* Decrease contrast of `border` slightly as padding/border combination is sufficient
 	 * accessibility wise and focus of content is more important here. */
-	border-color: #c8ccd1;
+	border-color: var(--border-color-base, #c8ccd1);
 }
 
 /* JavaScript disabled */
@@ -139,10 +139,10 @@
 				max-height: 15em;
 				box-sizing: border-box;
 				padding: 8px;
-				border: 1.5px solid #ccc;
+				border: 1.5px solid var(--border-color-subtle, #ccc);
 				border-radius: 4px;
-				background-color: #f5f5f5;
-				color: #333;
+				background-color: var(--background-color-neutral, #f5f5f5);
+				color: var(--color-base, #333);
 				font-family: 'Arial', sans-serif;
 				line-height: 1.5em;
 				overflow-y: auto;