refactor: remove card.rs / card_to_id; use card_game::Card directly (#83)

card_to_id was a frankenstein 0..=51 id shim. Replace it with card_game::Card:
- feedback_anim deal jitter now seeds off a hash of the Card itself
- radial_menu RightClickRadialState.cards: Vec<u32> -> Vec<Card>
- wasm CardSnapshot.id: u32 -> Card (serialises transparently as a plain JS
  number, the same opaque key the renderer already used; new test asserts the
  JSON id field is a number)
- wasm DebugInvariantReport deck-completeness check reworked from a [bool;52]
  index into a HashSet<Card> + Card::new reference deck; the out-of-range check
  is dropped since a Card is always valid

Delete card.rs entirely: the Card/Deck/Rank/Suit re-exports move to the crate
root and the 69 `solitaire_core::card::` import paths flatten to `solitaire_core::`.

The JS card.id is purely an opaque identity key (Map key / dataset.cardId, no
arithmetic, card faces render from rank+suit), so the value change is safe.
cargo test --workspace and clippy --workspace --all-targets -- -D warnings green.

Closes #83

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

solitaire_engine/src/radial_menu.rs

@@ -48,7 +48,7 @@ use bevy::math::Vec2;
 use bevy::prelude::*;
 use bevy::window::PrimaryWindow;
 use solitaire_core::{Foundation, KlondikePile, Tableau};
-use solitaire_core::card::Card;
+use solitaire_core::Card;
 use solitaire_core::game_state::GameState;
 
 use crate::card_plugin::TABLEAU_FACEDOWN_FAN_FRAC;
@@ -113,9 +113,9 @@ pub enum RightClickRadialState {
         /// radial is built around single-card foundation/tableau
         /// shortcuts and that matches the right-click highlight set).
         count: usize,
-        /// Card ids that would be moved (bottom-to-top order). Length
+        /// Cards that would be moved (bottom-to-top order). Length
         /// always equals `count`. Currently always one element.
-        cards: Vec<u32>,
+        cards: Vec<Card>,
         /// Pre-computed `(destination, icon_anchor_world_pos)` pairs.
         ///
         /// Anchors are evenly spaced around a ring of radius
@@ -359,7 +359,6 @@ fn pile_cards(game: &GameState, pile: &KlondikePile) -> Vec<(Card, bool)> {
     }
 }
 
-use solitaire_core::card::card_to_id;
 
 const fn foundations() -> [Foundation; 4] {
     [
@@ -500,7 +499,7 @@ fn radial_open_on_right_click(
     *state = RightClickRadialState::Active {
         source_pile,
         count: 1,
-        cards: vec![card_to_id(&card)],
+        cards: vec![card.clone()],
         legal_destinations,
         centre: world,
         hovered_index: None,
@@ -573,7 +572,7 @@ fn radial_open_on_long_press(
     *state = RightClickRadialState::Active {
         source_pile,
         count: 1,
-        cards: vec![card_to_id(&card)],
+        cards: vec![card.clone()],
         legal_destinations,
         centre: world,
         hovered_index: None,
@@ -796,7 +795,7 @@ mod tests {
     use super::*;
     use crate::layout::compute_layout;
     use bevy::ecs::message::Messages;
-    use solitaire_core::card::{Card as CoreCard, Deck, Rank, Suit};
+    use solitaire_core::{Card as CoreCard, Deck, Rank, Suit};
     use solitaire_core::{DrawStockConfig, game_state::GameState};
 
     /// Build a minimal Bevy app wired with `RadialMenuPlugin` and the