Fix empty sidebar entry for a heading that is a link#3146
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When a heading's entire content is a Markdown link (e.g. `## [fzf](url)`), mdBook wraps the heading content in an injected `<a class="header">` permalink anchor, producing nested anchors in the generated HTML. The browser hoists the inner link out as a sibling of the (now empty) permalink anchor, so copying `header.children[0]` into the sidebar yielded an empty anchor. Build the sidebar entry from the whole heading and unwrap the permalink anchor, so the heading text (and any embedded link) is preserved.
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Closes #3126.
When a heading's whole content is a Markdown link (e.g.
## [fzf](url)), the injected<a class="header">permalink wraps the link, producing nested anchors in the generated HTML. Browsers hoist the inner link out as a sibling of the (now empty) permalink anchor, so the sidebar'sfilterHeader(header.children[0], …)copied the empty anchor and rendered a blank entry.The sidebar entry is now built from the whole heading with the permalink anchor unwrapped, so the heading text (and any embedded link) comes through. This also fixes the previously-silent loss of an embedded link in headings like
## Heading with a [link](…).Verified the parsed-DOM behavior and the fix against jsdom for normal / markup /
<mark>/ link-only / text+link headings (link-only goes from""to"fzf"; others unchanged). Extendedheading-nav-markup.gomlwith a link-only heading plus assertions for both link cases.