Draw M3's dragged state on a card

Plan step 23, containment.md § Missing ("Cards: the dragged state").
`data-dragged` on `<x-card>` takes the top of M3's card elevation scale
— Level4 (8dp) elevated, Level3 (6dp) filled and outlined — under the
16% dragged state layer from tokens/state.css. The row's hover and press
rules now exclude a dragged card, so the card a pointer is holding stays
at its dragged level. The application owns the attribute: nothing in the
browser tells a card it is being carried.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/components/card.blade.php

@@ -26,6 +26,15 @@
      filled and outlined 0 → 1); its corner does not move, because M3 gives a card one shape.
      Never a stretched link, and never a whole-card `<a>` around buttons.
 
+     `data-dragged` is M3's dragged card: the top of a card's elevation scale — 8dp elevated, 6dp
+     filled and outlined — under the 16% dragged state layer, and it holds while the pointer is
+     down rather than falling back to the press state. Nothing in the browser tells a card it is
+     being carried, so the application sets the attribute when its drag starts and takes it off on
+     drop. M3 requires a single-pointer alternative beside any drag, so keep the same reorder or
+     delete actions in a menu on the card
+     (docs/reference/m3/components-actions-communication-containment.md § Cards → Specs,
+     Accessibility; resources/css/components/list.css draws it).
+
      Do not pass a `bg-*` class to change its fill — it races the card's own in Tailwind's emit
      order; use `variant`, or colour a wrapper inside. --}}