Fix Markdown rendering for sidebar sections with href

[cliffckerr]

Summary

Markdown in sidebar section titles (e.g. **More info**) render correctly when the section has no href, but is left as raw Markdown when the section has an href. HTML in the same title (e.g. <b>More info</b>) renders bold in both cases. This PR fixes the Markdown case.

Closes #14520.

Cause

Sidebar item text is emitted by sidebaritem.ejs via lodash <%= item.text %>, which is unescaped interpolation — so any raw HTML in the title passes through to the browser as-is. Markdown, however, requires a separate post-render pass to be converted to HTML. That pass lives in sidebarContentsHandler in src/project/types/website/website-navigation-md.ts:

1. getUnrendered() collects each section's text and hands it to pandoc, keyed by sectionId.
2. processRendered() walks the rendered DOM, identifies each section by reading data-bs-target off .sidebar-item-text, and swaps the pandoc-rendered HTML back in.

The two branches of sidebaritem.ejs produce different markup for the .sidebar-item-text element:

• No href: <a ... data-bs-toggle="collapse" data-bs-target="#<sectionId>"> — has data-bs-target.
• With href: <a href="..." class="sidebar-item-text sidebar-link"> — no data-bs-target.

So when a section has an href, processRendered can't recover the sectionId, falls through silently, and the raw markdown (**More info**) is left in the DOM.

Fix

The sibling .sidebar-item-toggle element (the chevron button) always carries data-bs-target="#<sectionId>", regardless of whether the section has an href. When .sidebar-item-text lacks the attribute, fall back to the sibling toggle.

Test plan

• Build a website with a sidebar section that uses both href: and a markdown-formatted section name, e.g.:

  - section: "**More info**"
    href: more-info.qmd
    contents:
      - href: about.qmd
      - href: contact.qmd

• Verify the rendered sidebar shows More info in bold (not literal **More info**).

• Verify sections without href still render markdown correctly (regression check).

• Verify sections with href but plain-text titles still work.

• Verify HTML in section titles (<b>...</b>) continues to render in both href and no-href cases.

I confirmed locally that this PR fixes the bug, but no tests were added.

(NB: PR written with the help of Claude)

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[mcanouil]

Thanks.
Some tests to ensure the behaviour and avoid future regression is needed.