Fix mobile card magnify: no phantom hover preview, larger art/power.

- A tap on a touch device synthesized mouseenter/mousemove and popped the
  hover magnifier on top of the tap-to-magnify overlay — a double image. Gate
  the hover preview on real hover capability ((hover: hover)) so touch taps
  only open the tap overlay.
- In that overlay the card is large, but its art, power badge, and text were
  still the tiny in-tray sizes; restore full-size art/power/damage/name/effect
  so the magnified card reads like a real card.

web/src/components/CardView.tsx

@@ -3,6 +3,13 @@ import { createPortal } from 'react-dom'
 import type { Card } from '../types'
 import { artFor, artUrlFor } from '../petArt'
 
+// The hover magnifier is a hover-only affordance. On touch devices a tap
+// synthesizes mouseenter/mousemove, which would pop the preview on top of the
+// tap-to-magnify overlay (a double image), so gate it on real hover capability.
+// Hover capability is effectively fixed per device, so check it once.
+const CAN_HOVER =
+  typeof window !== 'undefined' && !!window.matchMedia && window.matchMedia('(hover: hover)').matches
+
 // The tier shown as a die face (1–6 pips), like the real cards' corner marker.
 const DIE_PIPS: Record<number, [number, number][]> = {
   1: [[15, 15]],
@@ -236,9 +243,9 @@ export function CardView({
       data-card-id={card.id || undefined}
       onClick={disabled ? undefined : onClick}
       role={onClick ? 'button' : undefined}
-      onMouseEnter={preview ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
-      onMouseMove={preview ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
-      onMouseLeave={preview ? undefined : () => setHover(null)}
+      onMouseEnter={preview || !CAN_HOVER ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
+      onMouseMove={preview || !CAN_HOVER ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
+      onMouseLeave={preview || !CAN_HOVER ? undefined : () => setHover(null)}
     >
       {previewEl}
       {/* Upper illustration: a stylised landscape with the pet as a sticker and