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feat(carousel)!: slides by native scroll snapping, keeping the overlaid chrome (#966)

* feat(carousel)!: slides by native scroll snapping, keeping the overlaid chrome

The engine is a CSS scroll container now: .carousel-inner scroll-snaps,
the browser owns dragging, swiping and momentum, and programmatic jumps
animate the scroll position over a fixed 300ms (immune to Safari's
page-zoom smooth-scroll bug). The transform choreography is gone with
its state classes (carousel-item-next/prev/start/end, pointer-event —
declared in class-api-removals); .slide is inert and the markup skeleton
is unchanged. The controls, indicators and captions keep their overlaid
layout — the in-flow layout upstream defaults to is deliberately not
adopted.

Config: ride becomes autoplay (boolean), wrap becomes ends
(loop/wrap/stop — loop continues seamlessly through a transient clone
where the single-slide layout allows, stop disables the matching end
control), touch is gone (native). Autoplay turns off for good on user
interaction (WCAG 2.2.2) and fills the active indicator like a progress
bar over the slide's interval; a .carousel-control-play-pause button
with pause/play icons toggles it and swaps its aria-label.

New layout tokens on .carousel: --cui-carousel-items/-items-gap/
-items-peek with .carousel-center and .carousel-auto; crossfade stacks
slides on a grid and reads --cui-carousel-fade-duration/-timing
($carousel-transition\* removed).

The unit suite is the ported scroll-engine suite (105 specs) plus our
jQueryInterface block; full suite 3274 green. Live probe in Chromium:
one click scrolls one slide with active/indicator sync, the seamless
loop returns to the start with no leftover clones. Docs page rewritten
around the new engine; migration entries cover the config renames,
removed classes and new opt-ins.

* chore: raise the JS budgets for the scroll carousel

The scroll engine nearly doubles the carousel's TypeScript (a
scroll-position animator, an Intersecti... (continued)

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