Put hero main title/subtitle in search before_html (document flow),
move the search overlay outside the swiper as a sibling, and reset
search/slide-text positioning to zibll tops so title and search no
longer overlap.
Global border-box collapsed the banner's height:0 + padding-bottom
aspect box to zero, so slides rendered but took no space. Prefer
aspect-ratio (with content-box fallback) and make .new-swiper honor
data-swiper-config so autoplay/loop/navigation from templates apply.
Move header-slider outside main, render fluid zones once, default the
latest stream to plain posts by date, and cut dual-render/perf waste so
published posts and hero/banner structure match the zibll contract.
kate522