refactor(core): complete card_game::Card migration across engine + wasm

Finish the half-applied Card refactor. solitaire_core::card::Card is now an
alias for the opaque card_game::Card: suit()/rank() are methods, there is no
id or face_up field, and it is Clone+Eq+Hash but not Copy. Pile accessors
return Vec<(Card, bool)> where the bool is face-up.

Card identity is now the Card value itself (via Eq/Hash), not a numeric u32:
- CardEntity stores `card: Card` (was `card_id: u32`); lookups compare cards.
- Drag/selection collections and the touch/keyboard selection setters use
  Vec<Card>; CardFlippedEvent/CardFaceRevealedEvent/HintVisualEvent carry Card.
- replay_overlay and feedback/settle/deal animations updated accordingly.

solitaire_wasm: CardSnapshot derives its JSON id from suit+rank (matching the
desktop engine), and consumes the (Card, bool) pile tuples.

test-support: TestPileState tableau overrides now carry a per-card face-up flag
so tests can place face-down tableau cards. set_test_tableau_cards keeps its
Vec<Card> signature (defaulting to face-up); new set_test_tableau_cards_with_face
takes Vec<(Card, bool)>.

cargo test --workspace passes (engine lib 897 ok, 0 failed); cargo clippy
--workspace --all-targets -- -D warnings is clean. Save/serde format unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_core/src/klondike_adapter.rs

@@ -9,7 +9,6 @@
 //! upstream `card_game` / `klondike` types live here so that the product modules
 //! (`card`, `pile`, etc.) remain free of upstream dependencies.
 
-use card_game::Card as KlCard;
 use klondike::{
     DrawStockConfig, DstFoundation, DstTableau, Foundation, KlondikeConfig, KlondikeInstruction,
     KlondikePile, KlondikePileStack, MoveFromFoundationConfig, ScoringConfig, SkipCards, Tableau,
@@ -17,7 +16,6 @@ use klondike::{
 };
 use serde::{Deserialize, Serialize};
 
-use crate::card;
 use crate::game_state::GameMode;
 
 /// Whether cards are drawn one at a time or three at a time from the stock.
@@ -210,28 +208,6 @@ pub fn skip_cards_from_count(skip: usize) -> Option<SkipCards> {
     }
 }
 
-/// Convert a [`card_game::Card`] to a [`card::Card`], assigning a stable `id`
-/// derived from suit and rank (0–51, Clubs-first ordering).
-///
-/// The id is consistent for the same logical card across all reconstructions.
-pub fn card_from_kl(kl_card: &KlCard) -> card::Card {
-    let suit = kl_card.suit();
-    let rank = kl_card.rank();
-    let suit_index = match suit {
-        card::Suit::Clubs => 0,
-        card::Suit::Diamonds => 1,
-        card::Suit::Hearts => 2,
-        card::Suit::Spades => 3,
-    };
-    let id = suit_index * 13 + (rank.value() as u32 - 1);
-    card::Card {
-        id,
-        suit,
-        rank,
-        face_up: false,
-    }
-}
-
 // ── Legacy serde mirror types (kept for backward compatibility) ───────────────
 //
 // These types were introduced when upstream `klondike` had no serde feature.