The three async personalized loaders each did insertAdjacentHTML('afterbegin'), so 'Recommended
for you' / 'More like X' / gap rails landed in whatever order their fetch finished — the top of
the page reshuffled every load, and taste-based rails were scattered through generic ones.
Now Discover renders 6 authored groups in a fixed order, each with a header:
For you · Finish your collection · More of what you like · Trending & popular ·
Browse by genre · Hidden gems & more
Each async loader fills its own group's body (deterministic position) instead of racing to the
top; async-only groups (gaps) stay hidden until filled, and a group whose rails all drop out is
pruned. Extracted lazyShelfHtml/filledShelfHtml/shelfNav helpers; lazy-load, stagger, gen-guard,
see-all and scroll arrows all unchanged.
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