Sort cards C D S H so same-colour suits aren't adjacent

Reorder the suit sort (hand + widow overlay) to alternate colours
(clubs, diamonds, spades, hearts) so hearts and diamonds no longer sit
next to each other.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/app.js

@@ -1037,7 +1037,7 @@ function renderWidowOverlay(st) {
   updateWidowPreview(st);
 }
 
-const WIDOW_SUIT_ORDER  = ['C', 'D', 'H', 'S'];
+const WIDOW_SUIT_ORDER  = ['C', 'D', 'S', 'H'];
 const WIDOW_SUIT_LABEL  = { C: '♣', D: '♦', H: '♥', S: '♠' };
 const WIDOW_JOKER_LABEL = { 'JOKER-COLOR': '🌈', 'JOKER-BLACK': '⚫' };