Leave carousel items unmasked under reduced motion

Plan step 12, containment.md C-05. Only the parallax half of M3's rule
was honoured: the mask was still written every frame, so items kept
growing and shrinking between the keylines. Under reduced motion the
inset, the shift and the label fade are now all zero, so every item
stays at the strategy's large size and the keylines only decide where
the row snaps. `--material-carousel-pin` went with it: with no mask
there is nothing to pin the content to.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/components/carousel-item.blade.php

@@ -34,7 +34,7 @@
         data-material-carousel-surface
         class="relative size-full overflow-hidden rounded-corner-xl bg-surface-container-highest text-on-surface translate-x-(--material-carousel-shift) [clip-path:inset(0_var(--material-carousel-inset,0px)_round_var(--md-sys-shape-corner-xl))]"
     >
-        <div data-material-carousel-content class="size-full translate-x-(--material-carousel-pin) [&>img]:size-full [&>img]:object-cover">
+        <div data-material-carousel-content class="size-full [&>img]:size-full [&>img]:object-cover">
             {{ $slot }}
         </div>
 

resources/views/components/carousel.blade.php

@@ -40,8 +40,10 @@
      keys move one item, Home and End to the ends; focus moving into an item, or a press on one
      that is not fully open, brings it into focus. `controls` adds previous and next icon
      buttons under the row — by default only where the pointer is fine (a mouse or trackpad);
-     `true` always, `false` never. Under reduced motion they scroll instantly and content no
-     longer slides inside its mask. RTL mirrors the keylines, keys and buttons.
+     `true` always, `false` never. Under reduced motion they scroll instantly and nothing is
+     masked: every item stays at its large size, which is M3's rule for a carousel under reduced
+     motion (docs/reference/m3/styles.md § Motion → Accessibility requirements). RTL mirrors the
+     keylines, keys and buttons.
 
      Re-measures itself when resized, when a Livewire morph resets its styles and when items
      come and go. The row's id, which the buttons control, is new with every render; the row