feat(html): add fold.headers for sidebar header nav#3121
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When output.html.fold.headers is true and folding is enabled, apply the same fold level settings to the on-page header list in the sidebar.
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Summary
output.html.fold.headers(defaultfalse) to control folding of the page header list shown bysidebar-header-nav.headers = trueandenable = true, header items use the samelevelsemantics as chapter folding.heading-nav-foldedGUI test book to verify nested headers start collapsed.Fixes #3054
Test plan
cargo test -p mdbook-coreheading-nav-folded.goml(requires browser-ui-test in CI)