refactor: remove leftover redundancies after card_game migration

Post-migration audit found the card_game/klondike migration essentially
complete; these are the four small redundancies that remained:

- core: delete dead GameState::compute_time_bonus (zero callers; engine
  uses the klondike_adapter free fn directly)
- data: drop dead public re-exports load_latest_replay_from /
  save_latest_replay_to (no callers outside replay.rs); keep
  latest_replay_path (engine legacy migration still uses it)
- data+engine: lift win-XP scoring into a shared XpBreakdown so the
  win-summary modal breakdown and xp_for_win share one source of truth
  instead of duplicating the speed/no-undo constants
- engine: replace feedback_anim_plugin's private foundation_from_slot
  copy with the canonical klondike_adapter::foundation_from_slot

cargo test --workspace + clippy -D warnings green.

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

solitaire_data/src/lib.rs

@@ -124,8 +124,8 @@ pub use achievements::{
 
 pub mod progress;
 pub use progress::{
-    PlayerProgress, daily_seed_for, level_for_xp, load_progress_from, progress_file_path,
-    save_progress_to, xp_for_win,
+    PlayerProgress, XpBreakdown, daily_seed_for, level_for_xp, load_progress_from,
+    progress_file_path, save_progress_to, xp_breakdown, xp_for_win,
 };
 
 pub mod weekly;
@@ -172,8 +172,11 @@ pub use replay::{
     ReplayHistory, ReplayMove, append_replay_to_history, load_replay_history_from,
     migrate_legacy_latest_replay, replay_history_path, save_replay_history_to,
 };
+// `latest_replay_path` is still consumed by the engine's one-shot legacy
+// migration; `load_latest_replay_from`/`save_latest_replay_to` had no callers
+// outside `replay.rs` and were dropped from the public surface.
 #[allow(deprecated)]
-pub use replay::{latest_replay_path, load_latest_replay_from, save_latest_replay_to};
+pub use replay::latest_replay_path;
 
 #[cfg(not(target_arch = "wasm32"))]
 pub mod matomo_client;