feat(engine): cosmetic selectors applied, stats screen expanded, daily goals enforced

- Card backs: selected_card_back index maps to distinct Color values in card rendering
- Backgrounds: selected_background index applied in TablePlugin alongside theme
- Both re-render immediately on SettingsChangedEvent
- Stats screen now shows Games Lost, Draw 1/3 Wins, and Lifetime Score
- Daily challenge win no longer credited if server-supplied target_score or max_time_secs constraints are not met

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

solitaire_engine/src/stats_plugin.rs

@@ -171,12 +171,16 @@ fn spawn_stats_screen(
         "=== Statistics ===".to_string(),
         format!("Games Played:  {}", stats.games_played),
         format!("Games Won:     {}", stats.games_won),
+        format!("Games Lost:    {}", stats.games_lost),
         format!("Win Rate:      {win_rate}"),
         format!(
             "Win Streak:    {} (Best: {})",
             stats.win_streak_current, stats.win_streak_best
         ),
+        format!("Draw 1 Wins:   {}", stats.draw_one_wins),
+        format!("Draw 3 Wins:   {}", stats.draw_three_wins),
         format!("Best Score:    {}", stats.best_single_score),
+        format!("Lifetime Score:{}", stats.lifetime_score),
         format!("Fastest Win:   {fastest}"),
         format!("Avg Win Time:  {avg}"),
     ];