refactor: migrate PileType → KlondikePile across core/wasm/engine

- Replace PileType with typed KlondikePile (Foundation/Tableau variants)
  throughout solitaire_core, solitaire_wasm, and solitaire_engine;
  ReplayMove now uses SavedKlondikePile for serialisation stability
- Split replay_overlay.rs into replay_overlay/ module (mod, format,
  input, update, tests) for maintainability
- Add klondike dep to solitaire_engine and solitaire_data Cargo.toml
- Add TestPileState infrastructure to game_state.rs for engine unit tests
- Rebuild solitaire_wasm pkg (js + wasm artefacts updated)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_engine/src/touch_selection_plugin.rs

@@ -28,7 +28,7 @@
 
 use bevy::ecs::message::MessageReader;
 use bevy::prelude::*;
-use solitaire_core::pile::PileType;
+use klondike::KlondikePile;
 
 use crate::card_plugin::CardEntity;
 use crate::events::StateChangedEvent;
@@ -50,7 +50,7 @@ use crate::ui_theme::ACCENT_PRIMARY;
 #[derive(Resource, Debug, Default)]
 pub struct TouchSelectionState {
     /// Currently selected source pile and the card ids to move (bottom-to-top).
-    pub selected: Option<(PileType, Vec<u32>)>,
+    pub selected: Option<(KlondikePile, Vec<u32>)>,
 }
 
 impl TouchSelectionState {
@@ -60,12 +60,12 @@ impl TouchSelectionState {
     }
 
     /// Takes the current selection, leaving `selected` as `None`.
-    pub fn take(&mut self) -> Option<(PileType, Vec<u32>)> {
+    pub fn take(&mut self) -> Option<(KlondikePile, Vec<u32>)> {
         self.selected.take()
     }
 
     /// Sets the current selection.
-    pub fn set(&mut self, pile: PileType, cards: Vec<u32>) {
+    pub fn set(&mut self, pile: KlondikePile, cards: Vec<u32>) {
         self.selected = Some((pile, cards));
     }
 
@@ -186,6 +186,7 @@ fn spawn_touch_highlight(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use klondike::Tableau;
 
     #[test]
     fn selection_state_default_is_idle() {
@@ -197,12 +198,12 @@ mod tests {
     #[test]
     fn set_and_take_roundtrip() {
         let mut state = TouchSelectionState::default();
-        state.set(PileType::Tableau(0), vec![1, 2, 3]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau1), vec![1, 2, 3]);
         assert!(state.has_selection());
         let taken = state.take();
         assert!(taken.is_some());
         let (pile, cards) = taken.unwrap();
-        assert_eq!(pile, PileType::Tableau(0));
+        assert_eq!(pile, KlondikePile::Tableau(Tableau::Tableau1));
         assert_eq!(cards, vec![1, 2, 3]);
         assert!(!state.has_selection());
     }
@@ -210,7 +211,7 @@ mod tests {
     #[test]
     fn clear_removes_selection() {
         let mut state = TouchSelectionState::default();
-        state.set(PileType::Waste, vec![42]);
+        state.set(KlondikePile::Stock, vec![42]);
         state.clear();
         assert!(!state.has_selection());
     }
@@ -225,10 +226,10 @@ mod tests {
     #[test]
     fn set_overwrites_previous_selection() {
         let mut state = TouchSelectionState::default();
-        state.set(PileType::Tableau(0), vec![1]);
-        state.set(PileType::Tableau(3), vec![7, 8]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau1), vec![1]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau4), vec![7, 8]);
         let (pile, cards) = state.take().unwrap();
-        assert_eq!(pile, PileType::Tableau(3));
+        assert_eq!(pile, KlondikePile::Tableau(Tableau::Tableau4));
         assert_eq!(cards, vec![7, 8]);
     }
 }