fix(theme): add aria-hidden and aria-label to sidebar logo for access…

[MasterIfeanyi]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

The sidebar logo (shown when hideOnScroll is enabled) was not accessible to screen readers. When the navbar is visible, the logo is visually hidden behind it but had no aria-hidden attribute, causing screen readers like NVDA to unnecessarily announce it. When the navbar scrolls away and the logo becomes visible and interactive, it had no accessible label at all.

This fix adds aria-hidden={isNavbarVisible} so the logo is hidden from screen readers when it is not visible, and adds a localized aria-label via the translate() function when the logo is visible and acting as a real homepage link.

Closes #8429

Test Plan

1. Enable hideOnScroll: true in your Docusaurus site's themeConfig.navbar config.
2. Open a docs page that has a sidebar.
3. With the page at the top (navbar visible): inspect the sidebar logo element and confirm it has aria-hidden="true" and no aria-label.
4. Scroll down until the navbar disappears: inspect the sidebar logo again and confirm aria-hidden is gone and aria-label="Home page" is present.
5. Test with a screen reader (e.g. NVDA on Windows) to confirm the logo is not announced when hidden, and is announced correctly as "Home page" when visible.

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

Closes #8429

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