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_engine/src/auto_complete_plugin.rs

@@ -168,7 +168,7 @@ mod tests {
     use crate::game_plugin::GamePlugin;
     use crate::table_plugin::TablePlugin;
     use solitaire_core::{Foundation, KlondikePile, Tableau};
-    use solitaire_core::card::{Rank, Suit};
+    use solitaire_core::card::{Deck, Rank, Suit};
     use solitaire_core::{DrawMode, game_state::GameState};
 
     fn headless_app() -> App {
@@ -207,12 +207,7 @@ mod tests {
         }
         g.set_test_tableau_cards(
             Tableau::Tableau1,
-            vec![solitaire_core::card::Card {
-                id: 7_001,
-                suit: Suit::Clubs,
-                rank: Rank::Ace,
-                face_up: true,
-            }],
+            vec![solitaire_core::card::Card::new(Deck::Deck1, Suit::Clubs, Rank::Ace)],
         );
         g.is_auto_completable = true;
         let expected = (