Wire settings-driven sidebar visibility and body site-layout classes,
replace content-layout CSS grid with Zibll float geometry, move sidebar
DOM to content-wrap sibling across single/archive/page/home, and add
post meta show_layout overrides.
Replace the fragile content-wrap float + negative-margin sidebar with a
main.container grid, add fixed-nav top breathing room so the breadcrumb
stays below the header, and mark the aside as content-layout__aside.
Disable the global 2-col .content-layout grid on single pages (it was
tiling breadcrumb/article/author/related/comments left-right), add the
missing Zibll utility bridge used by the author/meta bar, and replace
nonstandard <name>/<item>/<badge> tags in the single surface.
Restore Zibll float dual-column shell, fix single settings DTO key mapping,
reorder article footer/actions, and match author bar, prev/next, title/body
typography, and limit-height expand UX.
kate522