A phone has no hover to preview a card, so tapping now opens a magnified,
fully-readable view with the actions that fit it instead of acting blind:
- Shop card: tap to see it big, then Buy (or read it even when unaffordable).
- Your deck card: tap to see it big, then Sell it, or Select to enter a
bulk-selection mode where taps toggle pets (no magnify) and the action bar
offers Sell / Triple / Cancel.
Desktop keeps click-to-buy and click-to-select unchanged; the new behavior is
gated on a max-width:600px media query via a small useMediaQuery hook.
Only buying costs gold; selling and trading (Triple) are free. Pass is
now a final action, legal only at or under the pet limit: it forfeits
remaining gold and ends that player's shopping for the round, with the
shop closing once everyone has passed. That makes the separate cleanup
phase unreachable (you sell down in-shop before passing), so it is
removed. The client asks for confirmation before passing, and the bot
knows buys are the only coin sink, when passing is legal, and that it
must sell down before it can pass.