Screen reader does not announce expanded/ collapsed state of left navigation controls in windows.

### Description

**User Impact:**
Users relying on screen readers or keyboard navigation are unable to understand the structure of the nested menu. They cannot intuitively or efficiently navigate between menu levels, leading to confusion and a breakdown in usability.

### Expected behavior

Screen reader should announce expanded/ collapsed state of left navigation controls in windows.

### Actual behavior

Screen reader does not announce expanded/ collapsed state of left navigation controls in windows.
Screen reader remains silent

**Refer Attachment:**
Screen reader does not announce expanded & collapsed state of left navigation controls in windows.png
Screen reader does not announce expanded & collapsed state of left navigation controls in windows.mp4

https://github.com/user-attachments/assets/7c843189-100b-46c5-9155-452a896b6efa

### Steps to reproduce

1. Open the URL: https://docsify-preview-git-fork-sy-records-fix-2599-docsifyjs.vercel.app/preview/#/?id=docsify in edge browser in windows.
2. Turn on narrator.
3. Press tab key to navigate to the Quick start present at the left navigation.
4. Verify that screen reader announces the expanded/ collapsed state of left navigation controls in windows or not.

### Environment

**Test Environment:**
OS: Windows 11 25H2 (26200.6584)
Browser: Edge (Version 142.0.3595.33)
Screen Reader: Narrator, NVDA (2025.2), JAWS (2025.2508.120)
URL: https://docsify-preview-git-fork-sy-records-fix-2599-docsifyjs.vercel.app/preview/#/?id=docsify

### Additional Information

- [x] Bug still occurs when all/other plugins are disabled?

Beginne damit, das Problem unter der bereitgestellten docsify-Vorschau-URL in Edge unter Windows mit Narrator oder einem anderen aufgeführten Screenreader zu reproduzieren, und untersuche dann die Steuerelemente der linken Navigation. Als erledigt gilt die Aufgabe, wenn der Screenreader beim Navigieren mit Tab ansagt, ob jedes verschachtelte Menüsteuerelement erweitert oder reduziert ist.

Vom Indexierungsmodell aus dem Issue-Text verfasst.