fix: let taps fall through to covered cards in deck stack

The right-side quick-menu container was always rendered with active
pointer events and stopPropagation on all pointer handlers, even when the
card wasn't revealed. Its buttons are only visibility-hidden (still occupy
layout), so the container kept a dead hitbox over the top-right strip - the
exact region exposed on a card sitting behind another. Tapping there did
nothing instead of revealing the covered card.

Gate the container's hitbox: pointer-events-none when inactive, re-enabled
on interactive / desktop group-hover / focus. Taps on a covered card's
exposed strip now fall through to the face button and reveal it.

Author: cfbender

assets/react/src/pages/decks/deck-stack-card.tsx

@@ -424,7 +424,12 @@ export function DeckStackCard({
         {!isSelecting ? (
           <ShareModeHidden shareMode={shareMode}>
             <div
-              className="absolute right-2 top-2 z-[115] flex items-center gap-1"
+              className={cn(
+                "absolute right-2 top-2 z-[115] flex items-center gap-1",
+                isInteractive
+                  ? "pointer-events-auto"
+                  : "pointer-events-none group-hover:pointer-events-auto group-focus-within:pointer-events-auto",
+              )}
               data-deck-stack-pointer-capture=""
               onClick={(event) => event.stopPropagation()}
               onMouseDown={(event) => event.stopPropagation()}