refactor: remove the remaining dead code leftovers (AI-assisted) (#12751)

- docs: remove the unused CategoryMetadataFilenameBase constant
- debug: remove the unused .active CSS class
- remove commented-out code leftovers

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: slorber

packages/docusaurus-mdx-loader/src/remark/contentTitle/index.ts

@@ -45,8 +45,6 @@ const plugin: Plugin<PluginOptions[], Root> = function plugin(
         return undefined;
       }
       if (node.type === 'heading') {
-        // console.log('headingNode:', headingNode);
-
         if (node.depth === 1) {
           vfile.data.contentTitle = toString(node);
           if (removeContentTitle) {

packages/docusaurus-plugin-content-docs/src/sidebars/generator.ts

@@ -26,7 +26,6 @@ function getLocalDocId(docId: string): string {
   return _.last(docId.split('/'))!;
 }
 
-export const CategoryMetadataFilenameBase = '_category_';
 export const CategoryMetadataFilenamePattern = '_category_.{json,yml,yaml}';
 
 type WithPosition<T> = T & {

packages/docusaurus-plugin-content-docs/src/sidebars/validation.ts

@@ -143,7 +143,6 @@ const sidebarItemSchema = Joi.object<SidebarItemConfig>().when('.type', {
     },
   ],
 });
-// .id('sidebarItemSchema');
 
 function validateSidebarItem(
   item: unknown,

packages/docusaurus-plugin-debug/src/theme/DebugLayout/styles.module.css

@@ -44,10 +44,6 @@
   background-color: #292a2b;
 }
 
-.active {
-  background-color: #363739;
-}
-
 @media screen and (width >= 800px) {
   .nav {
     flex-direction: column;

packages/docusaurus-theme-common/src/hooks/useTOCHighlight.ts

@@ -155,7 +155,6 @@ export function useTOCHighlight(config: TOCHighlightConfig | undefined): void {
         }
         link.classList.add(linkActiveClassName);
         lastActiveLinkRef.current = link;
-        // link.scrollIntoView({block: 'nearest'});
       } else {
         link.classList.remove(linkActiveClassName);
       }

packages/docusaurus-theme-common/src/utils/emojiUtils.ts

@@ -22,7 +22,6 @@ export function extractLeadingEmoji(input: string): {
 } {
   const it = segmenter.segment(input)[Symbol.iterator]();
 
-  // const first = segmenter.segment(input).containing(0)?.segment;
   const grapheme = it.next().value?.segment;
 
   if (!grapheme) {