fix(mobile): smaller trick cards on phones; drop duplicate XP bar on Profile

- Game table: played-card pile now uses sm cards on phones (vw<480) + slightly
  tighter scale, so the center trick no longer crowds/overlaps the side seats'
  avatars on a tall portrait screen.
- Profile: the screen showed two XP bars (the global header bar + the identity
  card's detailed bar). Hide the header bar on Profile (showXp=false).

Verified: tsc + next build clean; web rebuilt on :1500.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/screens/ProfileScreen.tsx

@@ -65,7 +65,8 @@ export function ProfileScreen() {
 
   return (
     <ScreenShell>
-      <ScreenHeader title={t("profile.title")} />
+      {/* showXp=false: the identity card below already has a detailed XP bar. */}
+      <ScreenHeader title={t("profile.title")} showXp={false} />
 
       {/* identity */}
       <motion.div