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Card design: - Separate cardFront + cardBack (each own/equip independently) - Fronts: classic (free), ivory/rosegold (buy), parchment/mint (earned) - Backs: classic (free), sapphire/emerald (buy), ruby/royal (earned) - PlayingCard `front` prop; table applies front to all faces, back to opponents - Profile has front + back pickers; shop has both sections Audio: - Web Audio synth engine (no asset files): SFX for card/deal/trump/trick, win/lose, message, notify, award, levelup, purchase, kot + ambient music - Toggles in profile (Audio) + mute button in game HUD; prefs persisted - Wired across game-store, rewards, daily, shop, chat Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>