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 })}
+      onMouseEnter={preview || !CAN_HOVER ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
-      onMouseMove={preview ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
+      onMouseMove={preview || !CAN_HOVER ? undefined : (e) => setHover({ x: e.clientX, y: e.clientY })}
-      onMouseLeave={preview ? undefined : () => setHover(null)}
+      onMouseLeave={preview || !CAN_HOVER ? undefined : () => setHover(null)}
     >
       {previewEl}
       {/* Upper illustration: a stylised landscape with the pet as a sticker and

web/src/styles.css

@@ -3060,11 +3060,24 @@ h3 {
     width: min(66vw, 230px);
     height: min(58vh, 312px);
   }
+  /* The magnified card is big, so restore full-size art, power badge, and text
+     (the phone .card-lg overrides had shrunk them for the tiny in-tray card). */
+  .card-focus .card-art {
+    font-size: 4rem;
+  }
+  .card-focus .card-power {
+    width: 44px;
+    height: 44px;
+    font-size: 1.25rem;
+  }
+  .card-focus .card-damage {
+    font-size: 1rem;
+  }
   .card-focus .card-name {
-    font-size: 0.95rem;
+    font-size: 1.05rem;
   }
   .card-focus .card-effect {
-    font-size: 0.66rem;
+    font-size: 0.72rem;
   }
   .card-focus-actions {
     display: flex;